09a 2010 Urban Water Management PlanMEMORANDUM
TO: CITY COUNCIL
FROM: TERESA OF COMMUNITY DEVELOPMENT
SUBJECT: CONSIDERATION OF THE 2010 URBAN WATER MANAGEMENT
PLAN
DATE: JANUARY 10,2012
RECOMMENDATION:
It is recommended the Council adopt the attached resolution approving the 2010 Urban
Water Management Plan (UWMP) and authorizing subrnittal to the Department of Water
Resources.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
Urban water suppliers need to adopt and submit to the Department of Water Resources
(DWR) an Urban Water Management Plan (UWMP) to comply with the California Water
Code and to be eligible to receive drought assistance or financial assistance from DWR.
'The proposed UWMP describes methods to continue the City's water conservation
programs in order to meet requirements of the 'Urban Water Management Planning Act
and provides a tool for future City water use planning and demand management
measures. Funds for water conservation programs are currently budgeted at
approximately $1 70,000 for 201 2-1 3 allocated from the water neutralization impact fund.
Additionally, expenditures may be requested in the future to provide matching funds for
South County regional efforts towards implementation of a recycled water plan.
BACKGROUND:
The Urban Water Management Planning Act (UWMP Act) (Division 6 Part 2.6 of the
California Water Code $1061 0 - 10656) requires all urban water suppliers providing
service to over 3,000 connections annually or serving more than 3,000 acre-feet per
year to submit a complete Urban Water Management Plan (UWMP) to the California
Department of Water Resources (DWR) every five years. DWR reviews the submitted
plans to make sure they have completed the requirements identified in the UWMP Act.
All urban water suppliers without a complete UWMP are ineligible to receive grant or
loan funding through DWR.
The 2000 UWMP was adopted by the Council in 2001 and amended in 2003 based on
comments received from DWR. The 2005 UWMP was adopted and sent to DWR in
2006, resubmitted to DWR in 2010 after comments were received and deemed
Agenda Item 9.a.Page 1
CITY COUNCIL
CONSIDERATION OF THE 2010 URBAN WATER MANAGEMENT PLAN
JANUARY 10,2012
PAGE 2
complete by DWR on December 9, 2010. The following 2010 UWMP has been
prepared to address requirements that have changed since the 2005 UWMP update.
ANALYSIS OF ISSUES:
The purpose of the Urban Water Management Plan is to:
*:* Satisfy the requirements of the UWMP Act;
*:* Provide a reliable tool for future City water use planning;
*:* Provide guidance for discussing regional water and land use planning with local
agencies;
*:* Provide a tool to ensure the City's eligibility for DWR grants and drought
assistance
*:* Provide a standardized methodology to assess and report water supply needs
and availability to the state government and community members;
*:* Serve as a critical component for development of the San Luis Region Integrated
Regional Water Management Plan (IRWMP)
*:* Serve as a resource for the California Water Plan and planned online information
exchange system called the Water Planning Information Exchange (Water PIE)
being developed by DWR.
The 2010 UWMP includes updates to water supply and demand projections, population
information, and descriptions of water reliability and water conservation efforts. The
water supply section of the plan focuses on groundwater, surface water, supplemental
water, and supply projections through the year 2030, including a 3-year worst-case
water supply estimate.
Population projections include a determination of existing and potential water service
connections, population projections from the San Luis Obispo Council of Governments,
and considers the overall build-out population of 20,000 in the City's General Plan as
amended by the draft 201 1 Housing Element update. Current water supply is projected
to meet the immediate and long-term needs of the City.
In the water conservation section, the plan describes the City's adherence to the
fourteen Demand Management Measures (DMM) established by the Department of
Water Resources. Importantly, the Water Conservation Bill of 2009, also known as
Senate Bill X 7-7, requires all water suppliers achieve a reduction in per capita per day
water use of 20% by December 31, 2020, with an interim target of 10% reduction by
December 31, 2015. The draft UWMP includes estimates of baseline per capita water
use of 186 gallons per capita per day (gpcd) (based on a ten year average from 1999-
2008), 2015 interim target of 167 gpcd, and a 2020 target of 149 gpcd. The City's daily
per capita water use for 2010 was 156. The City's water conservation programs will
help the City meet targets required by the UWMP Act.
Agenda Item 9.a.Page 2
CITY COUNCIL
CONSIDERA'rION OF THE 2010 URBAN WATER MANAGEMENT PLAN
JANUARY 10,2012
PAGE 3
ALTERNATIVES:
The following alternatives are offered for Council's consideration: - Provide comments for incorporation into the Draft 2010 Urban Water Management
Plan Update and direct staff to submit the Draft document to the Department of
Water Resources. - Continue the public workshop to allow for additional public comment. - Provide other direction to staff.
ADVANTAGES:
The workshop provides an opportunity for the public to identify constraints and propose
solutions'to water issues facing the City. Preparation and consideration of the plan allows
the City to evaluate its long term water resources planning needs. Submitting the 2010
UWMP to DWR will be in compliance with the statutory procedure for certification of the
plan.
DISADVANTAGES:
No disadvantages to approving the 2010 UWMP and submitting the plan to DWR have
been identified.
ENVIRONMENTAL REVIEW:
In accordance with the California Environmental Quality Act (CEQA) Guidelines, staff
has determined that the Resolution and Ordinance is exempt per Section 15282(v) of
the Guidelines.
PUBLIC NOTIFICATION AND COMMENTS:
A Public Hearing Notice was published in The Tribune twice on December 27, 2011 and
again on January 3, 2012 pursuant to State Law. In addition, notices were mailed to
interested individuals and organizations. The Agenda was posted in front of City Hall on
Thursday, January 5,2012. The Agenda and report were posted on the City's website on
Friday, January 6, 2012. No public comments were received.
Attachment: Urban Water Management Plan (On file at City Hall for public review and
available on the City's website at
www.arroyogrande.org)
Agenda Item 9.a.Page 3
RESOLUTION NO.
A RESOLUTION OF THE CITY COLlNClL OF THE CITY OF
ARROYO GRANDE, ADOPTING AND DIRECTING THE
FILING AND IMPLEMENTATION OF THE CITY OF ARROYO
GRANDE 2010 URBAN WATER MANAGEMENT PLAN
REVISION
WHEREAS, the California Legislature enacted Assembly Bill 797 during the 1983-1 984
Regular Session of the California Legislature (Water Code Sections 10610 et. seq.),
known as the Urban Water Management Planning Act, which mandates that every urban
supplier of water providing water for municipal purposes to more than 3,000 customers or
supplying more than 3,000 acre feet of water annually, prepare an Urban Water
Management Plan, the primary objective of which is to plan for the conservation and
efficient use of water; and
WHEREAS, AB 797 required that an initial plan be adopted by December 31, 1985, after
public review and hearing, and filed with the California Department of Water Resources
within thirty days of adoption; and
WHEREAS, the City of Arroyo Grande (City) did prepare and file an Urban Water
Management Plan with the California Department of Water Resources after adoption in
December, 1985 and last updated in 2005; and
WHEREAS, AB 797 requires that a plan be periodically reviewed at least once every five
years, and that the urban water supplier shall make any amendments or changes to its
plan which are indicated by the review and ensure adequate water supply to meet
demands, even during single and multiple dry-year events; and
WHEREAS, the City is an urban supplier of water providing water to more than 5,600
customers, and has therefore prepared and advertised for public review a draft Llrban
Water Management Plan Update, in compliance with the requirements of AB 797, and a
properly noticed public hearing regarding said Draft Plan Update was held by the City
Council on January 10,2012; and
WHEREAS, the City has completed the revisions requested by the Department of Water
Resources.
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Arroyo Grande
as follows:
1. The 2010 Urban Water Management Plan Update (Plan), a copy of which is on file
in the Community Development Department, and incorporated herein by this
reference as though set forth in full, is hereby adopted and ordered filed with the
City Clerk;
Agenda Item 9.a.Page 4
RESOLUTION NO.
PAGE 2
2. The City Manager is hereby authorized and directed to file with the Plan with the
California Department of Water Resources within 30 days after this date, in
accordance with AB 797;
3. The City Manager is hereby authorized and directed to implement the programs as
detailed in the adopted 2010 Urban Water Management Plan Update, including
development of recommendations to the City Council regarding necessary
procedures, rules, and regulations to carry out effective and equitable water
conservation programs;
On motion of Council Member , seconded by Council
Member , and on the following roll call vote, to wit:
Ayes:
Noes:
Absent:
the foregoing Resolution was passed and adopted this 10th day of January, 2012.
Agenda Item 9.a.Page 5
RESOLUTION NO.
PAGE 3
TONY FERRARA, MAYOR
ATTEST:
KELLY WETMORE, CITY CLERK
APPROVED AS TO CONTENT:
STEVEN ADAMS, CITY MANAGER
APPROVED AS TO FORM:
TIMOTHY J. CARMEL, CITY ATTORNEY
Agenda Item 9.a.Page 6
Urban Water
Management Plan
11/18/2011
2010 Update
Final Draft
2010 Urban Water Management Plan Final Draft
Table of Contents
City of Arroyo Grande i 11/18/2011
T able of Contents
Urban Water Management - 2010 Update
Table of Contents ............................................................................................................. i
List of Tables ................................................................................................................... iii
List of Figures .................................................................................................................. v
Acronyms ........................................................................................................................v i
1.0 Introduction & Agen cy Coordination ................................................................ 1 -1
1.1 Purpose of the Urban Water Management Plan .......................................... 1 -7
1.2 Plan Development and Adoption ................................................................. 1 -7
1.3 Relationship of the UWMP to Other Planning Efforts ................................. 1 -10
1.4 UWMP Organization .................................................................................. 1 -11
2 .0 Service Area Characteristics ........................................................................... 2 -1
2.1 Description of Service Area ......................................................................... 2 -1
2.2 Population and Demographics ..................................................................... 2 -4
2.3 Climate ......................................................................................................... 2 -8
3.0 Water Supply Sources .................................................................................... 3 -1
3.1 Resource Maximization and Import Minimiz ation ......................................... 3 -2
3.2 Surface Water - Lopez Reservoir .................................................................. 3 -3
3.3 Groundwater ................................................................................................ 3 -6
3.4 Supplemental Water Supply Sources ........................................................ 3 -14
4.0 Water Supply Reliability .................................................................................. 4 -1
4.1 Lopez Reservoir ........................................................................................... 4 -1
4.2 Groundwater ................................................................................................ 4 -3
4.3 Water Supply Reliability Analysis ................................................................. 4 -4
5.0 Water Use ....................................................................................................... 5 -7
5.1 Historical Water Use .................................................................................... 5 -8
5.2 Customer Types ......................................................................................... 5 -10
5.3 Per Capita Water Use ................................................................................ 5 -11
5.4 Projected Water Use .................................................................................. 5 -12
5.5 Non -Revenue Water Use ........................................................................... 5 -15
5.6 To tal Water Use ......................................................................................... 5 -15
5.7 Water Shortage Contingency Plan ............................................................. 5 -16
6.0 Water Conservation ........................................................................................ 6 -1
2010 Urban Water Management Plan Final Draft
Table of Contents
City of Arroyo Grande ii 11/18/2011
6.1 Water Survey Programs for Single -Family Residential and Multi -Family
Residential Customers ........................................................................................... 6 -2
6.2 Residential Plumbing Retrofit ....................................................................... 6 -2
6.3 Distribution System Water Audits and Leak Detection Repair ..................... 6 -3
6.4 Metering with Commodity Rates and Retrofit of Existing Connections ........ 6 -4
6.5 Large Landscape Water Conservation Programs and Incentives ................ 6 -4
6.6 High -Efficiency Washing Machine Rebates Program ................................... 6 -5
6.7 Public Information ........................................................................................ 6 -5
6.8 School Education ......................................................................................... 6 -7
6.9 Conservation Programs for Commercial, Indu strial and Institutional Accounts
6 -7
6.10 Wholesale Agency Programs ................................................................... 6 -7
6.11 Conservation Pricing ................................................................................ 6 -8
6.12 Water Conservation Coordinator ............................................................ 6 -11
6.13 Water Waste Prohibition ......................................................................... 6 -11
6.14 Residential Ul tra -Low Flush Toilet Replacement Programs .................... 6 -11
6.15 Evaluation of Demand Management Measures ...................................... 6 -11
6.16 Recycled Water Plan .............................................................................. 6 -13
6.17 Storm Water Reclamation ....................................................................... 6 -17
7.0 Water Quality Impacts and Water Service Reliability ...................................... 7 -1
7.1 Water Quality Impact on Water Reliability .................................................... 7 -1
7.2 Water Service Reliability .............................................................................. 7 -1
8.0 Adoption and Impl ementation .......................................................................... 8 -1
8.1 Public Meeting Notice .................................................................................. 8 -2
8.2 Adoption Resolution ..................................................................................... 8 -2
9.0 References ...................................................................................................... 9 -1
Appendix A. Judgment .................................................................................................... A
Appendix B. Management Agreement ............................................................................. B
Appendix C. Water Conservation Program .....................................................................C
Appendix D. Agency Notification and Coordination .........................................................D
Appendix E. Per Capita Water Use Memo ...................................................................... E
Appendix F. DWR Review Checklist ............................................................................... F
2010 Urban Water Management Plan Final Draft
List of Tables
City of Arroyo Grande iii 11/18/2011
List of Tables
Table 1 -1. Summary of Changes to th e UWMP Act Since 2005 .............................................. 1 -2
Table 1 -2. Changes Since the 2005 UWMP - Water Conservation Bill Requirements .............. 1 -6
Table 1 -3. Agency Coord ination (to be completed prior to submission to DWR) ...................... 1 -9
Table 2 -1. Historical and Projected Population for the City of Arroyo Grande and the City’s
Water Service Area 1 ................................................................................................................ 2 -5
Table 2 -2. Climate ................................................................................................................... 2 -8
Table 2 -3. Climate Continued .................................................................................................. 2 -9
Table 3 -1. Historical Water Sup ply – AFY ............................................................................... 3 -2
Table 3 -2. Current and Projected Water Supply – AFY ........................................................... 3 -2
Table 3 -3. Lopez Treatment and Distribution System Contract Entitlements 1 .......................... 3 -6
Table 3 -4. Historical Groundwater Pumping (AFY) .................................................................. 3 -7
Table 3 -5. Projected Groundwater Pumping (AFY) ................................................................. 3 -7
Table 3 -6. Current (2010) Groundwater Supply ....................................................................... 3 -7
Table 3 -7. Santa Maria Groundwater Basin Division of Safe Yield 1 ....................................... 3 -10
Table 3 -8. Lopez Reservoir Spillway Raise Capacities and Yields ........................................ 3 -15
Table 4 -1. Lopez Reservoir Safe Yield .................................................................................... 4 -1
Table 4 -2. Lopez Reservoir Average, Single Dry, and Multiple Dry Water Years 1 .................. 4 -2
Table 4 -3. Lopez Reservoir Historic Conditions 1 .................................................................... 4 -2
Table 4 -4. Factors Resulting in Inconsistency of Lopez Reservoir Supply 1 ............................. 4 -3
Table 4 -5. Other Factors Affecting Supply ............................................................................... 4 -4
Table 4 -6. Average, Single Dry, and Multiple Dry Years .......................................................... 4 -5
Table 4 -7. Arroyo Grande Projected Supply Reliability (AFY) .................................................. 4 -5
Table 4 -8. Minimum Available Water Supply (AFY) ................................................................. 4 -6
Table 5 -1. Historical Water Demand ....................................................................................... 5 -8
Table 5 -2. Historical Water Use by Category 2005 (AFY) ....................................................... 5 -9
Table 5 -3. Historical Water Use by Category 2010 (AFY) ....................................................... 5 -9
Table 5 -4. Base daily, Compliance, Interim Target, and Target Water Use ........................... 5 -11
Table 5 -5. Projected Water Use by Category 2015 (AFY) ..................................................... 5 -13
Table 5 -6. Projected Water U se by Category 2020 (AFY) ..................................................... 5 -14
Table 5 -7. Projected Water Use by Category 2025 & 2030 (AFY) ......................................... 5 -14
Table 5 -8. Non -Revenue Water - AFY ................................................................................... 5 -15
Table 5 -9. Total Water Use - AFY .......................................................................................... 5 -15
Table 5 -10. Water Rationing Stages and Conditions ............................................................. 5 -17
Table 5 -11. Consumption Reduction Methods for Critical Supply Stage ................................ 5 -18
Table 5 -12. Minimum Available Water Supply ....................................................................... 5 -19
Table 6 -1. Cost and Savings of Water Saving Devices ........................................................... 6 -3
Table 6 -2. Washing Machine Rebates .................................................................................... 6 -5
Table 6 -3. Hi gh -Efficiency Washing Machine Water Savings .................................................. 6 -5
Table 6 -4. Water Rates and Service Charges ......................................................................... 6 -8
Table 6 -5. Volume Charges .................................................................................................... 6 -9
Table 6 -6. Fire Protection Charges ....................................................................................... 6 -10
Table 6 -7. Sewer Rates and Service Charges ....................................................................... 6 -10
Table 6 -8. Wastewater collected and treated in the service area (AFY) ................................ 6 -14
Table 6 -9. Wastewater disposal methods and treatment level (AFY) .................................... 6 -14
Table 6 -10. Potential Uses and Quantities of Recycled Water (AFY) .................................... 6 -16
Table 6 -11. 2005 UWMP projections of recycled water use in 2010 and actual recycled water
u se in 2010 (AFY) ................................................................................................................. 6 -16
Table 6 -12. Projected Recycled Water Use ........................................................................... 6 -16
Table 7 -1. Supply and Demand - Normal Year (AFY) .............................................................. 7 -2
2010 Urban Water Management Plan Final Draft
List of Tables
City of Arroyo Grande iv 11/18/2011
Table 7 -2. Supply and Demand - Single Dry Year (AFY) .......................................................... 7 -2
Table 7 -3. Supply and Demand - Multiple Dry Years (AFY) ..................................................... 7 -3
2010 Urban Water Management Plan Final Draft
List of Figures
City of Arroyo Grande v 11/18/2011
List of Figures
Figure 2 -1. Arroyo Grande Vicinity on California Central Coast ............................................... 2 -2
Figure 2 -2. Water Service Area ............................................................................................... 2 -3
Figure 2 -3. City of Arroyo Grande General Plan Land Use Map .............................................. 2 -6
Figure 2 -4. City of Arroyo Grande Zoning Map ........................................................................ 2 -7
Figure 3 -1. Lopez Reservoir Water Distribution System .......................................................... 3 -4
Figure 3 -2. Santa Maria Groundwater Basin Adjudication Boundaries .................................... 3 -9
Figure 3 -3. City well locations associated with the Arroyo Grande Groundwater Basin ......... 3 -11
Figure 3 -4. City Well Locations Associated with the Pismo Formation .................................. 3 -13
Figure 5 -1. Historical, Current, and Projected Per Capita Water Use .................................... 5 -12
Figure 5 -2. Water Use by Sector ........................................................................................... 5 -15
Figure 6 -1. Water Conservation Brochure ............................................................................... 6 -6
Figure 6 -2. Water Conservation Brochure Continued .............................................................. 6 -6
2010 Urban Water M anagement Plan Final Draft
Acronyms
City of Arroyo Grande vi 11/18/2011
A cronyms
AFY A c re -feet per year
AGP -TCM Arroyo Grande Plain of the Tri -Cities Mesa
Ccf Hundred cubic feet
CEQA California Environmental Quality Act
CIMIS California Irrigation Management Information System
CSA Community service area
CSD Community services district
C UWCC California Urban Water Conservation Council
DAF Dissolved air flotation
DBP Disinfection -by -products
DMMs D emand management measures
DWR California Department of Water Resources
ERP Emergency Response Plan
ETo Evapotranspiration
F Y Fiscal Ye ar
Gpcd G allons per capita per day
WTP Water treatment plant
LUE Land Use Element
MGD Million Gallons per Day
MOU Memorandum of Understanding
MWC Mutual w ater company
NCMA Northern Cities Management Area
NPDES National Pollutant Discharge Eliminatio n System
NRW Non -revenue water
OCSD Oceano Community Services District
2010 Urban Water M anagement Plan Final Draft
Acronyms
City of Arroyo Grande vii 11/18/2011
PG&E Pacific Gas and Electric
RO Reverse osmosis
SB7 Senate Bill x 7 -7
SDWA Safe Drinking Water Act
Settlement Judgment in the Santa Maria Groundwater Basin Litigation
SLOCOG San Luis Obispo Council of Governments
SLOFCWCD San Luis Obispo County Flood Control and Water Conservation District
SSLOCSD South San Luis Obispo County Sanitation District
TDS T otal dissolved solids
THM Trihalomethanes
ULF Ultra -low flow toilet
UWMP Act U rban Water Management Plan Act
UWMP Urban water m anagement p lan
WRCC Western Regional Climate Center
WWTP Wastewater treatment plant
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -1 11/18/2011
1.0 I ntroduction & Agency Coordination
Water Code section 10620
(a) Every urban wat er supplier shall prepare and adopt an urban water management
plan in the manner set forth in Article 3 (commencing with Section 10640).
(b) Every person that becomes an urban water supplier shall adopt an urban water
management plan within one year after it has become an urban water supplier.
(c) An urban water supplier indirectly providing water shall not include planning
elements in its water management plan as provided in Article 2 (commencing
with Section 10630) that would be applicable to urban wate r suppliers or public
agencies directly providing water, or to their customers, without the consent of
those suppliers or public agencies.
(d)
(1) An urban water supplier may satisfy the requirements of this part by
participation in areawide, regional, w atershed, or basinwide urban water
management planning where those plans will reduce preparation costs and
contribute to the achievement of conservation and efficient water use.
(2) Each urban water supplier shall coordinate the preparation of its plan w ith
other appropriate agencies in the area, including other water suppliers that
share a common source, water management agencies, and relevant public
agencies, to the extent practicable.
(e) The urban water supplier may prepare the plan with its own staf f, by contract, or
in cooperation with other governmental agencies.
(f) An urban water supplier shall describe in the plan water management tools and
options used by that entity that will maximize resources and minimize the need to
import water from other regions.
Water Code section 10621.
(a) Each urban water supplier shall update its plan at least once every five years on
or before December 31, in years ending in five and zero.
(b) Every urban water supplier required to prepare a plan pursuant to this part shall,
at least 60 days prior to the public hearing on the plan required by Section 10642,
notify any city or county within which the supplier provides water supplies that
the urban water supplier will be reviewing the plan and considering amendments
or changes to the plan. The urban water supplier may consult with, and obtain comments from,
any city or county that receives notice pursuant to this subdivision.
(c) The amendments to, or changes in, the plan shall be adopted and filed in the
manner set forth in Article 3 (commencing with Section 10640).
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -2 11/18/2011
This report describes the 20 10 update of the Urban Water Management Plan (UWMP) for the
City of Arroyo Grande (City). The City is located in the Southern portion of San Luis Obispo
County. The City supplies its customers with domestic water service and fire protection and
currently serves a population of 16,901 .
The City prepared an U rban Water Management Plan in May 2001 for submittal to the California
Department of Water Resources (DWR) under the California Urban Water Management
Planning Act (UWMP Act) (Water Code Section 10610, et seq.). The 2001 UWMP was
amended in January 2003 ba sed on comments from DWR in the Urban Water Management
Plan Review Summary. The 2005 UWMP update was prepared to include information that had
changed since the May 2001 UWMP, and to format the report according to the “Guidebook to
Assist Water Suppliers in the Preparation of a 2005 Urban Water Management Plan”. The 2005
UWMP update was adopted by resolution in 2006 and submitted to DWR. The 2005 UWMP
was r evised to address DWR comments , and re -submitted in September 2010. The 2005
UWMP was accepted by DWR o n December 9, 2010 . The following 2010 UWMP update has
been prepared to address requirements that have changed since the 2005 UWMP update.
Table 1 -1 shows a summary of changes made to the UWMP Act since 2005.
Table 1 -1 . Summary of Changes to the UWMP Act Since 2005
Change New/ Revised
Water
Code Section
Number
Summary of Changes UWMP Approach
Notification 10621(b) Added : Provide at least 60 days
notification to any city o r county
within which the supplier provides
water for the public hearing
required by Section 10642.
The County of San
Luis Obispo, which is
located within the
City’s ser vice area,
was notified in a
timely manner to
meet the
requirement. A copy
of the letter of
notification of
preparation of the
UWMP is attached in
A ppendix D .
DMM
Compliance
10631(j) Changed : Members of the CUWCC
will be considered in compliance
with the DMM evaluation (10631 (f)
and (g)) if they comply with all the
provisions of the "Memorandum of
Understanding Regarding Urban
Water Conservation in California,"
dated December 10, 2008 and by
submitting their CUWCC annual
reports.
The City is not a
member of the
CUWCC .
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -3 11/18/2011
Table 1 -1 . Summary of Changes to the UWMP Act Since 2005
Wholesale
Suppliers
Source Wat er
10631(j) Deleted: Text identifying the
specific types of water an Urban
water supplier may seek information
from a wholesaler supplier. The
option to seek information from a
wholesale supplier is not deleted,
just the identification of source
wate r types.
No impact to this
UWMP.
Lower
Income
housing water
use
projections
10631.1 Added: Water use projections
required by Section 10631 shall
include projected water use for
single -family and multifamily
residential housing needed for lower
income households (Health and
Safety Code Section 50079.5) will
be provided. These water use
projections are to assist a supplier
in complying with Government Code
Section 65589.7 to grant priority of
the provision of service to housing
units affordable t o lower income
households.
Values are estimated
based on the City’s
customer data and
the San Luis Obispo
Council of
Governments’
Regional Housing
Needs Plan (s ee
Section 5.2.6 ).
Linkage of
DMM to State
grant or loan
program
10631.5(a) Changed: After January 1, 2009,
eligibility for state -funded grants or
loans will be conditioned on the
implementation of Section 10631
DMMs. If a DMM is not currently
being implemented, then the urban
water supplier submi ts to the
department for approval a schedule,
financing plan, and budget, to be
included in the grant or loan
agreement . If a DMM is not locally
cost -effective (the present value of
the local benefits is less than the
present value of local costs to
impl ement the DMM), then the
water supplier will submit supporting
documentation and the DWR will
provide a determination within 120
days of UWMP submittal.
No impact to this
UWMP.
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -4 11/18/2011
Table 1 -1 . Summary of Changes to the UWMP Act Since 2005
DMM
Compliance
10631.5(b) Added: DWR will consult with other
agencies and public input and
develop eligibility requirements for
meeting compliance with DMM
implementation. Determination of
DMM compliance will be based on
an individual water agencies
implementation or participation with
a regional group. An individual
water a gency will not be denied
eligibility if another participating
regional agency does not comply
with each of the DMMs
No impact to this
UWMP.
Determination
of Grant and
Loan
Eligibility
10631.5(c) Added: Grant and loan eligibility,
based on DMM comp liance, will be
included in the funding guidelines.
No impact to this
UWMP.
10631.5(d) Added: The administering agency
will request an eligibility
determination from DWR regarding
“the requirements of this section”.
DWR will respond within 60 days.
No impact to this
UWMP.
10631.5(e) Added: The water supplier may
submit copies of its annual reports
and other relevant documents to
assist DWR in determining
implementation or scheduling of the
water suppliers DMMs. Water
suppliers that are si gnatories of the
CUWCC MOU may submit its
annual reports to support its DMM
activities.
The City is not a
signatory to the
CUWCC MOU.
10631.5(f) Added: “This section” is in effect
only until July 1, 2016, after which it
is repealed, unless anoth er statute
is enacted.
No impact to this
UWMP.
New DMM
Independent
Technical
Panel
10631.7 Added: DWR, with the CUWCC,
will convene a technical panel to
provide information and
recommendations to DWR and the
Legislature on new DMMs,
technologies, and approaches.
There is further language on the
panel members and timing.
No impact to this
UWMP.
Potential
Recycled
Water Uses
10633(d) Added: Indirect potable reuse is to
be considered as an option for a
potential use of recycled water.
No impact to this
UWMP.
2010 Urban Water Management Plan Final Draft
1.0 Introduct ion & Agency Coordination
City of Arroyo Grande 1 -5 11/18/2011
Table 1 -1 . Summary of Changes to the UWMP Act Since 2005
UWMP
Distribution
10644(a) Added: A copy of the UWMP will
also be submitted to the California
State Library no later than 30 days
after its adoption
The City will submit a
copy of its adopted
UWMP to the
California State
Lib rary to meet this
requirement.
Exemplary
UWMP
Elements
10644(b) Added: ‘Exemplary’ elements of
individual plans are to be identified
in the 2011 Legislative Report
No impact to this
UWMP.
Exemplary
UWMP
10644(c) Added: (1), (2), and (3). Clarifying
that “exemplary” DMMs are those
that achieve water saving
significantly above the levels
established by DWR to meet the
requirements of 10631.7. The
results are to be distributed to the
panel convened pursuant to Section
10631.7 and the public .
No impact to this
UWMP.
Retail
Deadline
144644(j)(1)
Added: An urban retail water
supplier is granted an extension to
July 1, 2011, for adoption of an
urban water management plan.
The City will make its
best effort to adopt
the plan in a timel y
manner.
Wholesaler
Deadline
144644(j)(2)
Added: An urban wholesale water
supplier whose urban water
management plan . . .is granted an
extension to July 1, 2011, to permit
coordination between an urban
wholesale water supplier and urban
retail wat er suppliers.
No impact to this
UWMP.
10657 Deleted. No impact to this
UWMP.
In addition to the changes to the UWMP Act since 2005 shown in Table 1 -1 , the Water
Conservation Bill of 2009, also known as Senate Bill X 7 -7, was enacted in November 2009. To
increase statewide water use efficiency, it requires reduction of the statewide average per capita
daily water consumption by 20 percent by December 31, 2020, and requires “all water suppliers
to increase the efficiency of this essential resource” (C alifornia W ater C ode § 10608.4(a)). The
requirements of Senate Bill x 7 -7 (SB7) are shown in Table 1 -2 . For more information regarding
per capita water use refer to S ec tion 5.3 and the Base daily Daily Per Capita Water Use and
Target Water Use Technical Memorandum attached as Appendix E .
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -6 11/18/2011
Table 1 -2 . Changes Since the 2005 UWMP - Water Conservation Bill Requirements
CWC Citation Summary
10608.20(e) Include the base daily per capita water use, urban water use target,
interim water use target, and compliance daily per capita water use.
Provide basis for determination and supporting data references.
10608.20(g) The 2015 UWMP can update the 2020 urban water use target.
10608.20(h)(2)
An urban retail water supplier shall use the methods developed by the
department in compl iance [with methodologies and criteria developed by
DWR]
10608.20(j) Deadline for adoption of a UWMP is extended to July 1, 2011 to allow use
of the technical methodologies developed to establish base daily , target,
interim target, and compliance dai ly per capita water use.
10608.36 Wholesale suppliers will provide an assessment of their present and
proposed future measures, programs, and policies to achieve water use
reduction required in SB x 7 - 7.
10608.40 Urban water suppliers will rep ort progress toward meeting urban water
use targets in their UWMPs using a standardized form to be developed by
DWR. Note: This applies only to 2015 and 2020 UWMPs because they will
report “progress” toward meeting targets established in this, the 2010
UWM P.
10608.42 DWR will review the 2015 UWMPs and report to the Legislature the
progress toward achieving a 20 -percent reduction in urban water use by
December 31, 2020.
Information used to complete this report was compiled from a variety of sources , including:
Arroyo Grande Groundwater Basin Groundwater Management Agreement (see
A ppendix B )
Arroyo Grande Urban Water Management Plan 2005 U pdate, September 2010
Arroyo Grande Water Supply Alternatives, August 24, 2004 (1)
Capacity Evaluation of the Lopez Pipeline (2)
City of Arroyo Grande General Plan Housing Element (3)
City of Arroyo Grande General Plan Land Use Element (4)
City of Arroyo Grande Staff
City of Arroyo Grande Water Conservation Program, May 13, 2003 (see A ppendix C )
City of Arroyo Grande Water System Master Plan, Month 2011 (Currently being
developed ) (5)
Guidebook to Assist Urban Water Suppliers to Prepare a 2010 Urban Water
Management Plan, March 2011 (6)
Methodologies for Calculating Baseline and Compliance Urban Per Capita Water Us e,
February 2011 (7)
Recycled Water Distribution System Conceptual Plan (8)
Recycled Water Distribution System Conceptual Plan Technical Memorandum (9)
Regional Housing Needs Plan (10)
San Luis Obispo County 2040 Population, Housing & Employment Forecast (11)
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -7 11/18/2011
San Luis Obispo County Flood Control and Water Conservation District Zone 3 Urban
Water Management P lan 2010 Update (12)
San Luis Obispo County Master Water Plan (13)
San Luis Region Integrated Regional Water Management Plan (14)
Supplemental Water Supply Study Nacimi ento Pipeline Extension (15)
Water and Wastewater Financial Plan and Rate Study (16)
Water Balance Study for the Northern Cities Area (17)
Water Recycling Update Report (18)
Water Supply Study: Desalination (19)
1.1 P urpose of the Urban Water Management Plan
The State of California requires all urban water suppliers serving more than 3,000 customers or
providing more than 3,000 acre -fee t of water annually to develop an UWMP, and to submit a
plan to the DWR every five years. The UWMP is a valuable planning document used for multiple
purposes:
- Satisfies the requirements of the California Urban Water Management Planning A ct
(UWMP Act)
- Provides a reliable tool for future City water use planning
- Provides guidance for discussing regional water and land use planning with local
agencies
- Provides a tool to ensure the City’s eligibility for DWR grants and drought assistance
- Prov ides a standardized methodology to assess and report water supply needs and
availability to the state government and community members
- Serves as a critical component for developing the San Luis Region Integrated Regional
Water Management Plan (IRWMP)
- Serve s as a resource for the California Water Plan and a planned online information
exchange system called the Water Planning Information Exchange (Water PIE) being
developed by DWR
The UWMP includes a description and evaluation of existing and potentially avai lable sources of
water supply, projected population and future water demand, demand management measures
(DMMs), and strategies for responding to water shortage s.
1.2 P lan Development and Adoption
The 20 10 UWMP update has been prepared to include information t hat has changed since the
200 5 UWMP, as amended, and to format the report according to the DWR’s Guidebook to
Assist Urban Water Suppliers to Prepare a 2010 Urban Water Management Plan, March 2011
(6).
The City prepared this update of its UWMP during the summer of 2011 and adopted it on Month
Day, 2011 . The updated plan was presented at a public hearing conducted by the City Council
o n Month Day, 2011 and was submitted to the DWR , the California State Library, and San Luis
Ob ispo County within 30 days of Council adoption. A notice of intent to prepare the UWMP was
sent to the County of San Luis Obispo on July 20, 2011 (see A ppendix D ). The public review
hearing was noticed on Month Day, 2011 and the h earing notice is attached in Section 8.1 . In
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -8 11/18/2011
addition, the City maintained a copy of the 2010 UWMP update in its office starting on Month
Day, Year . This plan includes all information necessary to meet the requirements of the
C alifornia Water Code, Division 6, Part 2.6 .
1.2.1 Agency Coordination
Coordination between multiple departments within the City provided valuable input including
long -range land use pr ojections and future service needs , past and current water use data,
billing s tructures, and leak audit information.
In the interest of collaboration and shared resources, the City has coordinated development of
the UWMP with nearby water and governing agencies. Table 1 -3 shows the agencies the City
coordi nated with during the preparation of this UWMP. The City receives a portion of its water
resources from the Lopez Reservoir Project as described in Section 3.2 . The City provided its
Lopez Reservoir Project demand for the next twenty years to t he San Luis Obispo County Flood
Control and Water Conservation District (SLOFCWCD) in a letter that is available in A ppendix
D . SLOFCWCD prepared its 2010 UWMP Update for Zone 3, which operates Lopez Reservoir
and provides treated potable water to a number of other agencies in south San Luis Obispo
County includ ing the City of Pismo Beach, the City of Grover Beach, Avila Beach Community
Services District, Oceano Community Services District , and County Service Area 12, which
includes Port San Luis Harbor District . In its UWMP, SLOFCWCD identified the projected
demand from the City as 2,290 AFY through 2030 based on the City’s current entitlement of the
current safe yield as discussed in Section 3.2 . The City coordinated with all of the agencies
involved with the Lopez Reservoir Project during the development of its UWMP .
One of the City’s groundwater sources is the Santa Maria Valley Groundwater Basin. The basin
is adjudicated, and the te rms of the adjudication proceedings require formalized interagency
coordination and collaboration , including a framework for monitoring, sharing information , and
discussing water usage and impacts of pumping activity . The Santa Maria Valley Groundwater
Bas in and the specifics relating to the adjudication are described in further detail in Section
3.3.1 .
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -9 11/18/2011
Table 1 -3 . Agency Coordination (to be completed prior to submis sion to DWR)
Pa
r
t
i
c
i
p
a
t
e
d
i
n
De
v
e
l
o
p
i
n
g
t
h
e
P
l
a
n
Co
m
m
e
n
t
e
d
o
n
t
h
e
Dr
a
f
t
At
t
e
n
d
e
d
P
u
b
l
i
c
Me
e
t
i
n
g
s
Wa
s
C
o
n
t
a
c
t
e
d
f
o
r
As
s
i
s
t
a
n
c
e
Wa
s
S
e
n
t
a
C
o
p
y
o
f
th
e
D
r
a
f
t
P
l
a
n
Wa
s
S
e
n
t
a
N
o
t
i
c
e
o
f
In
t
e
n
t
i
o
n
t
o
A
d
o
p
t
Avila Beach Community Services District
Avil a Valley Mutual Water Company
California Department of Water Resources
California State Library
City of Grover Beach X
City Pismo Beach X
City of Santa Maria
County of San Luis Obispo X X
County Service Area 12
Nipomo Mesa Management Area Technical Group
Northern Cities Management Area Technical Group
Oceano Community Services District
Port San Luis Harbor District
San Luis Obisp o Council of Governments
San Luis Obispo Co unty Flood Control and Water
Conservation District X
San Miguelit o Mutual Water Company
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -10 11/18/2011
Table 1 -3 . Agency Coordination (to be completed prior to submis sion to DWR)
Pa
r
t
i
c
i
p
a
t
e
d
i
n
De
v
e
l
o
p
i
n
g
t
h
e
P
l
a
n
Co
m
m
e
n
t
e
d
o
n
t
h
e
Dr
a
f
t
At
t
e
n
d
e
d
P
u
b
l
i
c
Me
e
t
i
n
g
s
Wa
s
C
o
n
t
a
c
t
e
d
f
o
r
As
s
i
s
t
a
n
c
e
Wa
s
S
e
n
t
a
C
o
p
y
o
f
th
e
D
r
a
f
t
P
l
a
n
Wa
s
S
e
n
t
a
N
o
t
i
c
e
o
f
In
t
e
n
t
i
o
n
t
o
A
d
o
p
t
Santa Maria Valley Water Conservation District
South San Luis Obispo County Sanitation District
1.2.2 Public Participation
The City has involved th e public in the conservation planning process since the development of
its first UWMP in 1985. Since the last update of the UWMP in 20 05 , the City has distributed
information, including the City’s Conservation Program, Mandatory Retrofit Program, as well a s
annual water quality reports on the City’s website , in customer utility bills , and by general mail. A
public hearing for the UWMP was held on Month Day, 2011 . Legal public notices were
published in the local newspaper (The Tribune ) at least t wo weeks prior to the hearing, and
copies of the draft plan were made available on the City’s website (www.arroyogrande.com ) and
posted at the City Hall starting Month Day, 2011
1.2.3 City Council Meetings and Adoption
As discu ssed previously, a public hearing was held at a regular City Council meeting on Month
Day, 2011 for the 20 10 UWMP update . The UWMP was adopted at a regular City Council
meeting on Month Day, 2011 .
1.3 R elationship of the UWMP to Other Planning Efforts
The Cit y has identified the need to obtain additional water availability to meet the projected
water demands of the City. The Water Supply Alternative s Study was prepared in August 2004
to identify one or more short, intermediate , and long term supply alternative s that meet the
City’s objectives for water quantity, quality , and reliability (1). The Water Supply Alternatives
Study report was followed by other supplemental water supply reports includ ing the following:
- Water Recycling Upd ate Report, January 2009 (18)
- Water Supply Study: Desalination, January 2006 (19)
- Supplemental Water Supply Study Nacimiento Pipeline Extension (15)
- Capacity Evaluatio n of the Lopez Pipeline for Delivery of Additional State Water Project
Supplies to the Northern Cities Technical Memorandum (2)
- Memorandum: Lopez Reservoir Expansion - Spillway Raise Project Advisory Group
Recommendations, Janua ry 2009 (subsequent study currently being developed )
2010 Urban Water Management Plan Final Draft
1.0 Introduction & Agency Coordination
City of Arroyo Grande 1 -11 11/18/2011
T he City Council reviewed the San Luis Obispo County Integrated Regional Water Management
Plan (IRWMP), of which the City is a participant , o n October 11, 2005 at its public meeting. The
City is coordina ting the preparation of the UWMP with this regional water planning effort. The
UWMP s erves as a critical component for developing the IRWMP and maintains consistency
with the goals and policies of the IRWMP. The IRWMP provides an opportunity for the City t o
apply for state funding for planning or implementation of projects and enhances integration with
regional, countywide, and statewide water resources planning strategies and policies.
Through its involvement in the N orthern Cities Management Area (NCMA), the City has
reviewed and provided input on the County’s ongoing Master Water Plan Update project,
including demand and supply projections developed prior to this UWMP.
The City is beginning an update of the Agriculture, Conservation and Open Space Elem ent of
the General Plan, which will include goals and policies for the City’s water resources. The
UWMP will provide information and background for this planning process.
The City is preparing an update of the Housing Element of its General Plan. A draft of the
Housing Element will be available in mid -November. This UWMP will be consistent with the
information provided in the Housing Element.
The City is also preparing an update to its Wastewater System and Water System Master Plans.
This UWMP was pr epared in concurrence with the master plan ning efforts and reflect s
consistent demand and supply data and projections .
1.4 UWMP O rganization
This UWMP update has been prepared according to the Guidebook to Assist Urban Water
Suppliers to Prepare a 2010 Urban Water Management Plan (6). Information from the 200 5
UWMP has been incorporated and reformatted to comply with the format and requirements
de scribed in the 2010 Guidebook.
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -1 11/18/2011
2.0 Service Area Characteristics
The following sectio ns describe the service area of the City, including the current and projected
climate, population, and demographics
2.1 D escription of Service Area
The City is located in the southern portion of San Luis Obispo County along the banks of the
Arroyo Grande Creek . The Pacific Ocean lies approximately 1.5 miles to the west. The City is
bordered by the City of Grover Beach to the west, the communities of Oceano and Halcyon to
the southwest, Pismo Beach to the northwest and unincorporated portions of the County of Sa n
Luis Obispo to the north, northeast, and southeast. The City, a general law entity, currently
incorporates 5.87 square miles of land with primarily residential and agricultural land uses. The
City’s distinctive character derives from its traditional ties to agriculture, physical diversity,
unique village, small town atmosphere, and rural settings. The current (2010) population of the
City is 17,252 according to the U.S. Census Bureau ; however the City currently serves water to
a population of 16 ,901 resid ents . The City’s water service area population includes residents of
9 water service connections outside of City limits and excludes residents of 138 connections
served by Oceano Community Service District in an area located in the southwest portion of the
City limits (see Figure 2 -2 ). All 6,473 connections to the City’s water system are metered, and
there are no agricultural or industrial connections. In 20 10 , the City purchased and produced a
total of 2,955 acre -feet of water. Wa ter supply sources for the City are described in Section 3.0 .
Water Code section 10630 & 10631
10630. It is the intention of the Legislature, in enacting this part, to permit levels of
water management planning commensurate with the numbers of customers served
an d the volume of water supplied.
10631. A plan shall be adopted in accordance with this chapter that shall do all of the
following:
(a) Describe the service area of the supplier, including current and projected
population, climate, and other demographic f actors affecting the supplier's water
management planning. The projected population estimates shall be based upon
data from the state, regional, or local service agency population projections
within the service area of the urban water supplier and shall be in five -year
increments to 20 years or as far as data is available.
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -2 11/18/2011
Figure 2 -1 . Arroyo Grande Vicinity on California Central Coast
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -3 11/18/2011
Figure 2 -2 . Water Service Area
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -4 11/18/2011
The City delivers both surface water and groundwater through its pressurized distribution
system. The distribution system is composed of 88 miles of distribution mains, six storage
reservoirs , six pumping stations, and 6,473 service connections . The City’s well system consists
of eight wells , chlor am ination facilities, and a static mixer . Well No. 9 and No. 10 extract water
from the Pismo Formation located outside of the NCMA boundary . Raw water from Well No. 9
receives treat ment prior to entering into the system for iron/manganese and hydrogen sulfide .
Lopez Project water receives treatment at the Lopez Water Treatment Plant (Lopez WTP) and
enters the City’s system at two metering stations. All City potable water is treated t o meet
drinking water standards, regardless of the source of supply. Wastewater treatment is
conducted by the South San Luis Obispo County Sanitation District (SSLOCSD) at their
Regional Treatment Facility located in Oceano .
2.2 P opulation and Demographics
The City is largely built -out and is expected to experience only modest growth over the next 25
years. The build -out population, defined as the maximum population that can occur considering
the zoning and land use designations of the current General Plan, is established at 20,000
persons based on the City’s General Plan Housing Element. The build -out population may
increase if an annexation of approximately 185 acres of land and subsequent development were
to occur on a portion of land that lies southeast of t he City within the City’s Sphere of Influence.
The land use development policies within the City are established in the City’s General Plan,
principally by the Land Use Element (LUE) (4). Th e last comprehensive update to the Ge neral
Plan occurred in October 2001, with Housing Element amendments certified by the state in
2005.
The City’s population within City Limits was 17,252 in 2010 according to the 2010 U.S. Census.
The City does not serve water to the entire population with in its City Limits. The Oceano
Community Services District serves a portion of the population in the southwestern part of the
City. The City also serves some customers outside of City Limits. To meet the requirements of
Senate Bill x 7 -7 (SB7), an estimate of the service area population was calculated in the Base
daily Daily Per Capita Water Use and Target Water Use Technical Memorandum attached as
Appendix E . Based on the methodology described in Appendix E , t he service area population in
2010 was 16,901.
The San Luis Obispo Council of Governments (SLOCOG) projects population for the City
through 2040 in its San Luis Obispo County 2040 Population, Housing & Employment Fore cast
(11). The service area population projections are based on annual growth rates calculated from
the mid growth scenario population projections from SLOCOG’s report. The annual growth rates
are applied to the 2010 serv ice area population to yield the projected service area population
shown in Table 2 -1 .
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -5 11/18/2011
Table 2 -1 . Historical and Projected Population for the City of Arroyo Grande and the City’s
Wa ter Service Area 1
2005 2010 2015 2020 2025 2030
Service Area
Population 16,682 16,901 17,553 17,943 18,552 19,077
City Population 16,599 2 17,252 3 17,524 4 18,407 4 18,933 4 19,591 4
1 The City population is based on the population within the City Limits b oundary and the water service
area population is based on the City’s service area boundary, which is different from the City Limits. 2 Source: U.S. Census Bureau, 2005 -2009 American Community Survey
3 Source: U.S. Census Bureau, 2010 4 SLOCOG 2040 Pop ulation, Housing & Employment Forecast (11)
Existing zoning districts within the City are shown in Figure 2 -4 below. The future land use area
allocated for residential development is estimated to be 86 percent Residential Single Family ,
10 percent Residential Multi -Family , and 4 percent Mobile Home Parks at build -out (see Figure
2 -3 ). Historically, most of the City’s residential growth has occurred on large lots and at low
densities. However, it is anticipated that future growth will be redistributed to the City’s mixed -
use and higher density residential areas. Based on project submittals over the past two years,
as well as projected development, the recent and foreseea ble trend for new residential
development is in the form of higher density, mixed use infill and redevelopment, clustered
subdivision, small -lot planned unit development and condominiums.
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -6 11/18/2011
Figure 2 -3 . City of Arroyo Grande General Plan Land Use Map
2010 Urban Water Management Plan Final Draft
2.0 Service Are a Characteristics
City of Arroyo Grande 2 -7 11/18/2011
Figure 2 -4 . City of Arroyo Grande Zoning Map
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -8 11/18/2011
2.3 C limate
The climate of the City has a Mediterranean coastal climate with mild, dry summers and cool,
wet winters. Th e annual precipitation is 16.14 inches, with the majority of the rain occurring
during the months of January through March. Table 2 -2 and Table 2 -3 outline the climate
characteristics for the City area ba sed on average historical climate data. The normal year
evapotranspiration rate (Eto) for the City is approximately 52 inches.
Table 2 -2 . Climate
Jan Feb Mar Apr May Jun
Standard
Monthly
Average ETo 1
2.2 1 2.5 3.8 5.08 5.7 6.19
Average
Rainfall
(inches)2
3.61 3.66 2.51 1.06 0.31 0.02
Average
Temp (F) 3
52.94 54.4 55.21 56.86 58.17 60.32
1 E t o data from CIMIS (20)
2 Average rainfall data from S an L uis O bispo County Public Work s Volunteer Precipitation
Gauge Station (AG Corp Yard #177.1) www.slocountywater.org/weather (y ea rs 19 66 -20 10 ) 3 Average temperature data from Western Regional Climate Center
http://www.wrcc.dri.edu (y ea rs 1949 -20 10 )
2010 Urban Water Management Plan Final Draft
2.0 Service Area Characteristics
City of Arroyo Grande 2 -9 11/18/2011
Table 2 -3 . Climate Continued
Jul Aug Sep Oct Nov Dec Annual
Standard
Monthly
Average
E t o 1
6.43 6.09 4.87 4.09 2.89 2.28 52.13
Average
Rainfall
(inches)2
0.02 0 0.12 0.6 1.68 2.55 16.14
Average
Temp (F) 3
61.28 62.09 62.48 61.15 57.55 53.7 57.8
1 E t o data from CIMIS (20) 2 Average rainfall data from S an L uis O bispo County Public Works Volunteer Precipitation
Gauge Stat ion (AG Corp Yard #177.1) www.slocountywater.org/weather (y ea rs 19 66 -20 10 )
3 Average temperature data from Western Regional Climate Center
http://www.wrcc.dri.e du (y ea rs 1949 -20 10 )
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -1 11/18/2011
3.0 W ater Supply Sources
The City has a variety of water sources including groundwater, local surface water, and ponded
storm water used for groundwater recharge, irrigation and construction water. The City has
completed multiple stud ies of potential supplemental water supply sources including an
extension of the Nacimiento Pipeline, desalination, recycled water, and State Water Project
water from the County . These studies are discussed further in Section 3.4 , Section 6.16 , and
Section 6.17 . Other potential sources of water include water transfer agreements as discussed
in Section 3.4.1 . The following tables outline the Ci ty’s current and planned water supplies for
the next 20 years.
Water Code Section 10631
10631. A plan shall be adopted in accordance with this chapter and shall do all of the following:
(b) Identify and quantify, to the extent practicable, the exis ting and planned sources
of water available to the supplier over the same five -year increments described in
subdivision (a). If groundwater is identified as an existing or planned source of water available to
the supplier, all of the following information shall be included
in the plan:
(1) A copy of any groundwater management plan adopted by the urban water
supplier, including plans adopted pursuant to Part 2.75 (commencing with
Section 10750), or any other specific authorization for groundwater
management .
(2) A description of any groundwater basin or basins from which the urban water
supplier pumps groundwater. For those basins for which a court or the board
has adjudicated the rights to pump groundwater, a copy of the order or decree
adopted by the cour t or the board and a description of the amount of
groundwater the urban water supplier has the legal right to pump under the
order or decree. For basins that have not been adjudicated, information as to
whether the department has identified the basin or ba sins as overdrafted or
has projected that the basin will become overdrafted if present management
conditions continue, in the most current official departmental bulletin that
characterizes the condition of the groundwater basin, and a detailed
description of the efforts being undertaken by the urban water supplier to
eliminate the long -term overdraft condition.
(3) A detailed description and analysis of the location, amount, and sufficiency
of groundwater pumped by the urban water supplier for the past fiv e years.
The description and analysis shall be based on information that is reasonably
available, including, but not limited to, historic use records.
(4) A detailed description and analysis of the amount and location of
groundwater that is projected to b e pumped by the urban water supplier. The
description and analysis shall be based on information that is reasonably
available, including, but not limited to, historic use records.
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -2 11/18/2011
Table 3 -1 . Historical Water Supply – AF Y
Water Supply Sources 1980 1985 1990 1995 2000 2005
Groundwater – Santa
Maria Groundwater Basin 1,2 0 2 1,20 2 1 ,202 1 ,202 1 ,202 1,2 02
Groundwater – Pismo
Formation 0 0 0 8 0 8 0 80
County of San Luis Obispo
Lopez Reservoir Project 2,290 2,290 2,290 2,290 2,290 2,290
Surplus Lopez Project
Water 600 700 910 500 0
Oceano Community
Services District 100
TOTAL 3,490 4,090 4,192 4,472 4,062 3,758
Table 3 -2 . Current and Projected Water Supply – AF Y
Water Supply Sources 2010 2015 2020 2025 2030
Groundwater – Santa
Maria Groundwater Basin 1,323 1,323 1,323 1,323 1,323
Groundwater – Pismo
Formation 1 80 200 200 200 200
County of San Luis Obispo
Lopez Reservoir Project 2,290 2,290 2,290 2,290 2,290
Oceano Community
Services District 2 100 100
TOTAL 3,793 3,913 3,813 3,813 3,813
1 Assumes 80 AFY of g roundwater from Well No. 9, 80 AFY from Well No. 10 , and 40 AFY from Well No.
11 will be available as a reliable source of supply from 2015 through 2030. 2 Assumes that the remaining three years of the five year contract of 100 AFY with OCSD will be utili zed
in 2014, 2015, and 2016.
3.1 R esource Maximization and Import Minimization
The City is committed to reducing the necessity to import water and maximize the available local
resources. A big part of maximizing available resources is developing an effective w ater
conservation program. The City has maintained a non -revenue water average of 4.9% of gross
water use. Residents can participate in water efficiency programs, like the plumbing retrofit
program , the Smart Irrigation Controller program , and the Cash for Grass program . In the
plumbing retrofit program, residents can request high efficiency toilets, showerheads, faucet
aerators, and pressure regulators funded by the City. Smart -irrigation controllers are also
available to residents, which decrease the wate r use needed to irrigate the property. The City
residents can also receive $150 dollars by upgrading their current washing machine to a high -
efficiency washing machine. Finally, the City offers 50 cents per square foot to replace lawn with
native vegetatio n or artificial turf .
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -3 11/18/2011
Along with water efficiency programs, the City has been operating a successful storm water
recycling program at the Arroyo Grande Sports Complex. The City has reduced their water
demand by about 100 AFY irrigating 45 acres of grass and field. Additionally, the City recently
conducted a study to utilize recycled wastewater. The City uses no recycled wastewater;
however the study outlined potential recycled water usage that would reduce potable water
needs by 2 01 AFY. The same study a lso outlined a storm water reclamation program that would
reduce water needs by an additional 43 AFY.
3.2 S urface Water - Lopez Reservoir
Lopez Dam and Reservoir were planned, designed, and constructed under the auspices of the
San Luis Obispo County Flood Co ntrol and Water Conservation District (SLOFCWCD). The
Dam and Reservoir were completed in 1970 ; the primary purpose of the reservoir is to provide
water supply for contracting communities within the County Flood Control Zone No. 3 , however
there are many o ther important benefits of the project includ ing recreation, flood control, and
regulated release for Arroyo Grande Basin groundwater recharge. The Lopez Reservoir has a
capacity of approximately 49,388 acre -feet. The Lopez Dam is 1,120 feet in length and has a
vertical height of 166 feet. A steel transmission main , ranging in diameter from 20 -inch to 30 -
inch, carries untreated water from the dam to the 844 acre -foot Lopez terminal reservoir at the 6
MGD 1 Lopez Water Treatment Plant (WTP ). Treated water i s conveyed from the Lopez WTP to
water contractors in the Five Cities area (including Arroyo Grande, Grover Beach, Oceano,
Pismo Beach, and Avila Beach) via the Lopez Pipeline (12).
1 The Zone 3 2010 UWMP states that the capacity of the Lopez WTP is 6 MGD (12). According to Lopez WTP
operators the maximum design capacity of the WTP is 6.7 MGD (38).
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -4 11/18/2011
Figure 3 -1 . Lopez Reservoir Water Distribution System
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -5 11/18/2011
Safe Yield
The current s afe y ield of Lopez Reservoir is 8,730 AFY , which reflects the sustainable water
supply during a drought. The s afe y ield is derived from two historical studies: Lopez Proj ect
Hydrology Review, conducted in June 1962, and the Hydrologic Balance of Arroyo Grande
Groundwater Basin, conducted in November 1962. The reservoir is operated to stay within the
s afe y ield. As previously noted, over half of the project’s s afe y ield (4,530 AFY ) has been
apportioned by agreements to contract agencies (see Table 3 -3 ). The remaining 4,200 AFY is
reserved for downstream releases. The s afe y ield is currently being re -evaluated as part of an
ongoing study to determine the feasibility of raising the dam spillway with an inflatable weir. If
the Safe Yield is increased, the City will increase its entitlement.
Lopez WTP
Because of the bodily -contact recreation use, public health officials required the installation of a
t erminal reservoir between Lopez Dam and the Lopez WTP . T his reservoir provides a
theoretical detention time of over 30 days for 844 acre -feet of storage. Untreated w ater is drawn
from the intake tower of the terminal dam and passed through an influent pipe line to the 6 MGD 1
treatment plant.
The Lopez WTP includes chemical pretreatment, dissolved air floatation, membrane
micro filtration, chlorine dioxide disinfection , and chloramination for distribution system residual .
The current average daily flow is a pproximately 4.0 MGD. Major infrastructure is designed with
a maximum capacity of 6 .7 MGD 1 .
Lopez Distribution System
Water is distributed to the various agencies through the Lopez Distribution System, which
extends from the treatment facility to Port San Luis. The distribution system conveys a blend of
treated water from the Lopez Reservoir and the State Water Project to the communities of
Arroyo Grande, Grover Beach, Pismo Beach, Oceano, and County Service Area (CSA) 12. The
pipeline is approximately 17.6 miles long with various turnouts to the contracting agencies. The
turnouts are sized to meet corresponding contract requirements. T he distribution line consists of
concrete mortar lined and coated steel p ipe which i s 33 inches in diameter from the Lopez
Treatment Plant to Edna Road, 30 inches to Brisco Road, 18 inches from Grover Beach to Vista
Del Mar, and 14 inches to El Portal.
The operation and maintenance of the dam, treatment plant, and water conveyance system are
the responsibility of SLOFCWCD.
1 The Zone 3 2010 UWMP states that the capacity of the Lopez WTP is 6 MGD (12). According to Lopez WTP
operators the maximum design capacity of the WTP is 6.7 MGD.
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -6 11/18/2011
Table 3 -3 . Lopez Treatment and Distribution System Contract Entitlements 1
Water Contractor Lopez WTP Water Supply Annual
Entitlement (AFY)
Arroyo Grande 2 ,290
Oceano CSD 303
Grover Beach 800
Pismo Beac h 896
Avila Valley MWC 12
San Miguelito MWC 0
Avila Beach CSD 68
Port San Luis 100
Other CSA 12 Customers 61
TOTAL 4 ,530
1 Entitlements are b ased on the current estimated safe yield. Entitlements may change if the
safe yield changes.
Operating Agr eements
Several agreements establish policy for the operation of the Lopez system and actions of the
member agencies. A brief description of the existing agreements follows:
1. Agreement for the construction and operation of the Lopez Reservoir, 1969, set forth the
project's capital cost distribution to the member agencies.
2. Downstream water rights agreement, 1983, established water entitlements for adjacent and
downstream water users (See Table 5 -3 ).
Arroyo Grande Lope z Entitlement
The City is contracted to receive 2 ,290 acre -feet of water per year from the Lopez Reservoir.
The City’s allocation accounts for approximately 50.55 percent of the available water from
Lopez.
Surplus Entitlement
During years when less than 4,200 AFY is required to be released for downstream flows,
surplus supply is available. The surplus is offered to Contract Agencies including the City.
3.3 G roundwater
Prior to 1970, the City’s water supply was derived solely from groundwater pumping from the
Arroyo Grande Plain of the Tri -Cities Mesa (AGP -TCM) groundwater sub -basin of the Santa
Maria Valley Groundw ater Basin. In 1966, the City entered into an agreement with the
SLOFCWCD to receive a yearly allocation of 2,290 acre -feet of additional water from the Lopez
2010 Urban Water Management Plan Final Draft
3.0 Water Sup ply Sources
City of Arroyo Grande 3 -7 11/18/2011
Reservoir Project, as described above. Currently, the City pumps from two different
groundwater basins: the Santa Maria Valley Groundwater Basin and the Pismo Formation
outside of the NCMA boundary , which is referred to as the Pismo Formation th roughout this
UWMP . Tab le 3 -4 and Table 3 -5 show the historical and projected groundwater pumping for
each groundwater source. Table 3 -6 shows current groundwater supplies.
Tab le 3 -4 . Historical Groundwater Pumping (AFY)
Basin Names 2006 2007 2008 2009 2010
Groundwater –
Santa Maria
Groundwater Basin
1,025 1,256 1,096 799 539
Groundwater –
Pismo Formation 0 16 67 80 70
Total gro undwater pumped 1,025 1,272 1,164 879 610
Percent of total
water supply 31% 35% 33% 27% 21%
Table 3 -5 . Projected Groundwater Pumping (AFY)
Basin Names 2015 2020 2025 2030
Groundwater –
Santa Maria
Ground water Basin
798 497 599 686
Groundwater –
Pismo Formation 200 200 200 200
Total groundwater pumped 998 697 799 886
Percent of total
water supply 30% 23% 26% 28%
Table 3 -6 . Current (2010) Groundwater Supp ly
Basin Name AF Y
Santa Maria G roundwater Basin 1,323
Pismo Formation 160
TOTAL 1,483
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -8 11/18/2011
W ater used for agriculture within the City limits is produced from privately -owned wells and from
riparian diversions. The City does not have any agricultural connec tions. According to the 2002
DWR report on Water Resources of the Arroyo Grande – Nipomo Mesa Area , the owners of
these private agricultural water wells produce approximately 40 percent of the water extracted
from the AGP -TCM sub -basin. The major divers ions of surface water occur during irrigation of
lands adjacent to the Arroyo Grande Creek. The Lopez Project is obligated to discharge up to
4,200 acre -feet of untreated surface water into Arroyo Grande Creek during non -spill periods.
The purpose of this release is to maintain groundwater levels in the wells downstream of the
dam and to satisfy downstream vested water rights. Agricultural groundwater pumping rates are
expected to remain relatively constant or decrease slightly with the use of advanced wate ring
technology in the future.
3.3.1 Santa Maria Valley Groundwater Basin
Four urban agencies including the City, the City of Grover Beach, the City of Pismo Beach, and
the Oceano Community Services District , known as the Northern Cities, currently extract wat er
from the Santa Maria Valley Groundwater Basin. Additional basin uses include agricultur e, local
landowners, and subsurface flow to the Pacific Ocean.
The Northern Cities as well as local land owners, the County of San Luis Obispo, and the
SLOFCWCD hav e worked together to manage local surface water and groundwater resources
since the late 1970s. A yearly basin extraction was established based on a 1979 Groundwater
Study performed by the Department of Water Resources. According to the 1979 Groundwater
S tudy, the Safe Yield of the Arroyo Grande Groundwater Basin is 9,500 acre -feet per year. The
above mentioned entities entered into an agreement in 1983 regarding safe well extractions
from the basin. This agreement is often referred to as the “Gentleman’s Agreement”.
In 2002, an Agreement Regarding Management of the Arroyo Grande Groundwater Basin
(Groundwater Management Agreement) was adopted by the Northern Cities and other parties
(see A ppendix B ) that superseded the 1983 Gent lemen’s Agreement. The Groundwater
Management Agreement specifie d division of safe yield of the basin. The City’s entitlement from
the Arroyo Grande Groundwater Basin wa s established at 1,202 AFY by the Groundwater
Management Agreement . Per the Groundwater Management Agreement, this entitlement has
been increased to 1,323 AFY based on the conversion of irrigated agricultural lands to urban
use (21).
In 2005, the Groundwater Management A greement was incorporated in the the Sant a Maria
Valley Groundwater Basin Adjudication. The Superior Court of California, County of Santa Clara
then adopted the Judgment in its Judgment After Trial on January 25, 2008. The Judgment is
attached as A ppendix A . The Judgment requires stipulating parties to comply with each and
every term of the Judgment , which includes areas of continuing jurisdiction, groundwater
monitoring, reporting, and the technical oversight c ommittee. The management area of the
Northern Cities is defin ed in the Judgment as the Northern Cities Management Area (NCMA).
Fig ure 3 -2 shows the location of the Santa Maria Groundwater Basin Adjudication boundar y and
management areas . The NCMA Technical Group (NCMA TG) is the technical o versight
committee that oversees groundwater monitoring and reporting for the NCMA. The NCMA TG
prepares an annual report to collect and analyze data relating to land and water uses within the
basin, sources of supply, and groundwater conditions.
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -9 11/18/2011
Fig ure 3 -2 . Santa Maria Groundwater Basin Adjudication Boundaries
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -10 11/18/2011
Table 3 -7 . Santa Maria Groundwater Basin Division of Safe Yield 1
Applied Irrigation 5,300
Sub surface flow to Ocean 200
City of Arroyo Grande 1 ,323 1
City of Grover Beach 1 ,407 1
City of Pismo Beach 700
Oceano CSD 900
TOTAL 9,830
1 Source: Groundwater Management Agreement (see A ppendix B ) Per the Ground water Management
Agreement, th e entitlement has been increased to 1,323 AFY from 1,202 AFY for the City and 1,407 AFY
from 1,198 AFY for Grover Beach based on the conversion of irrigated agricultural lands to urban use (21).
Figure 3 -3 shows the City’s well system for pumping groundwater from the Arroyo Grande
Groundwater Basin.
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -11 11/18/2011
Figure 3 -3 . City well locations associated with the Arroyo Grande Gr oundwater Basin
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -12 11/18/2011
3.3.2 Pismo Formation
The Pismo Formation is a distinct deep aquifer at the northeastern section of the City, identified
in water wells along Oak Park Boulevard on the south, at Paseo Ladera Lane to the west, and
along James Way to the east. Cur rently, the City pumps groundwater from Well No. 9 and Well
No. 10 , which are capable of extracting approximately 90 AFY each if operated 100% of the
time , but are assumed to extract 80 AFY each assuming required operational downtime . Both
well s receive tr eatment for iron , manganese and hydrogen sulfide prior to discharge into the
system. Well No. 11 is assumed to be operational by 2015 . Well No. 11 is capable of extracting
approximately 45 AFY if operated 100% of the time, but is assumed to extract 40 AFY assuming
required operational downtime. Water supply from the Pismo Formation is not subject to the
Groundwater Management Agreement for the Arroyo Grande Groundwater Basin. The Pismo
Formation is not adjudicated and has not been identified as overdrafted or projected to be
overdrafted by DWR. In 2003, Cleath & Associates completed a groundwater source
assessment for the Oak Park area, which covers the same aquifer as the Pismo Formation. The
groundwater yield for the Oak Park area was estimated to be appro ximately 540 AFY (22). The
City exercises an appropriative right to put the water supply from the Pismo Formation to
reasonable and beneficial use. The City’s appropriative right allows it to pump available
groundwater surplus to the needs of all existing overlying rights in the b asin .
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -13 11/18/2011
Figure 3 -4 . City W ell L ocations A ssociated with the Pismo Formation
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -14 11/18/2011
3.4 S upplemental Water Supply Sources
The City has completed multiple stud ies of potential supplemental water supply sources
including an extension of the Nacimiento Pipeline, desalination, and recycled water. Based on
the results of these studies, an extension of the Nacimiento Pipeline and desalination are not
feasible or cost -effective at this time or within the timeline of this UWMP. Based on the recycled
water studies, the City determined recycled water is not currently cost -effective. The City plans
to pursue grant funding to make recycled water cost -effective as described in Section 6.16 . In
order to meet total projected water use, as well as offset potential future water shortages due to
drought or disaster, the City is considering the following supplemental water supplies .
3.4.1 Transfers/Exchanges
Oceano Community Service District (OCSD): In August 2005, the City entered into a two -year
agreement with the OCSD to provide 100 AFY. The City never purchased water under this
agreement. In January 2009, the City renewed the contract with OCSD for a 5 -yea r period. The
supply from OCSD is intended to provide sufficient time to develop other supplemental water
supply alternatives. The City has submitted a proposal to OCSD to establish a permanent
purchase agreement.
Surplus water from Lopez: Historically, the City and other contracted agencies ha ve received
surplus water from Lopez depending upon yearly requirements for downstream release. The
SLOFCWCD - Zone 3 monitors the potential for surplus water availability consistent with the
water supply agreement.
Lopez Reservoir Spillway Raising: In 2008/2009, the contract a gencies of the Lopez Reservoir
conducted a study and evaluation to consider raising the spillway elevation of Lopez Reservoir,
as a means of increasing safe yield in the reservoir and thus in creasing water supply
entitlements to the contract a gencies. By raising the spillway a few feet, the overall capacity of
the reservoir increases significantly. The increased capacity will correlate to a greater
entitlement of the water supply that can be d istributed to the City and the surrounding contract
agencies. The project study examines raising the spillway of Lopez D am by 3 to 5 feet. This
would increase gross reservoir storage capacity by a maximum of 2,850 -4,750 acre -feet. A nnual
average yield is e stimated to be increased from 671 to 1,371 acre -feet . However, based on
evaluation of historic drought years (1986 -1996), the average yield disbursed over 11 years
would provide an estimated safe yield from 25 9 -432 AFY (12). Table 3 -8 shows the maximum
Water Code Section 10631
10631. A plan shall be adopted in accordance wit h this chapter and shall do all of the following:
(h) Include a description of all water supply projects and water supply programs that may be
undertaken by the urban water supplier to meet the total projected wate r use as established
pursuant to subdivis ion (a) of Section 10635. The urban water supplier shall include a detailed
description of expected future projects and programs, other than the demand management
programs identified pursuant to paragraph (1) of subdivision (f), that the urban water suppli er may
implement to increase the amount of the water supply available to the urban water supplier in
average, single -dry, and multiple -dry water years. The description shall identify specific projects and
include a description of the i ncrease in water supp ly that is expected to be available from each
project. T he description shall include an estimate with regard to the implementation timeline for
each project or program.
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -15 11/18/2011
storage capacity, average yield, and safe yield for raising the spillway by 3, 4, and 5 feet. The
next phase of this study is currently under way and is expected to be completed later this year.
Table 3 -8 . Lopez Reservoir Spillway Raise Capacities and Yields
Raised Spillway Height
3 Feet 4 Feet 5 Feet
Maximum Storage Capacity
(acre -feet)
2,850 3,800 4,750
Average Yield (acre -feet)1 671 -916 834 -1,166 974 -1,371
Safe Yield (AFY) 259 346 432
1 Ranges are based on three different scenarios analyzed over historical conditions from 1969 -
2004. Source: (23)
Supplemental State Project Water via the Coastal Branch and Lopez Pipel ines : SLOFCWCD is
in the process of complet ing a hydraulic stud y to determine if additional capacity exists in the
Central Coa st Water Authority (CCWA) State Water Pipeline for supplemental water deliveries
to CCWA subscribe rs, including Contract Agencies (served via the Lopez Pipeline). The
hydraulic study modeled the entire CCWA pipeline delivery system , plus the Lopez pipeline . The
study has not been finalized, and is still under review (12), however it is anticipated that th e
results of this study will be used as a starting point for the SLOFCWCD and CCWA to enter into
negotiations to consider utilization of the County’s excess State Water Project entitlement, and
could provide an opportunity for the City to purchase a tempor ary, permanent and/or drought
buffer allocation from the project.
Additional Storm Water Reclamation: A detention basin currently exists at the Wal -Mart Site
near the intersection of West Branch Street and Camino Mercado , which according to staff,
holds water year -round due to storm water inflow. The year -round storage volume is currently
unknown; however the approximate volume of the basin is 6.4 acre -feet (9). The Recycled
Water Distribution System Conceptual Plan Technica l Memorandum recommends conducting a
feasibility study for the storm water reclamation project. If the storm water is deemed a viable
source of water, it would potentially offset potable water demand by approximately 43 AFY (9).
2010 Urban Water Management Plan Final Draft
3.0 Water Supply Sources
City of Arroyo Grande 3 -16 11/18/2011
3.4.2 Desalination
In January 2006 the report entitled Water Supply Study: Desalination (19) was prepared to
evaluate the feasibility of obtaining an additional 750 AFY of potable water for the City from
seawater desa lination. The report was prepared with the assumption that two neighboring water
agencies, the City of Grover Beach and the Oceano Community Services District, would
collaborate to determine if a seawater desalination plant would suit the supplemental wate r
needs of each community.
Based on the 20 -year life cycle cost analysis, the cost per acre -foot of desalination water would
be approximately $2675/ A cre F oot . This value includes a 20% contingency, and all capital
costs were multiplied by a factor of 1 .4 to account for soft costs. While a desalination facility
would involve a more complicated permitting process than other supplemental water sources, it
is one of the few water supply sources that are completely drought -proof. A desalination facility
has the benefit of being able to run continuously, twenty -four hours per day, seven days per
week for constant supply regardless of water shortages throughout the area.
Based on th e information presented in the study , the City does not plan on pursuing
desa lination immediately as a supply source. The City does not quantify any projected
desalinated water supply in this UWMP. However, as technology becomes more affordable and
as the process of implementing a desalination facility becomes more viable and cost -effective ,
the City may consider desalination as a potential supply source in the future.
Water Code Section 10631
10631. A plan shall be adopted in accordance with this chapte r and shall do all of the
following:
(i) Describe the opportunities for development of desalinated water, including, but
not limited to, ocean water, brackish water, and groundwater, as a long -term
supply.
2010 Urban Water Management Plan Final Draft
4 .0 Water Supply Reliability
City of Arroyo Grande 4 -1 11/18/2011
4.0 W ater Supply Reliability
4.1 L opez R e servoir
T he Lopez Reservoir is considered to be a very reliable source of water supply . The annual safe
yield of the reservoir i s 8,730 AFY as described in Section 3.2 . 4,530 AFY of the reservoir’s safe
yield is apportioned to contract agencies. The remaining 4,200 AFY of safe yield is reserved for
downstream releases to maintain stream flows and ground water recharge downstream. I n years
when less water is required to be released downstream in the Arroyo Grande Creek, additional
water (known as surplus water) may be available fo r sale to contracting agencies. Table 4 -1
outlines the annual safe yield based on this information.
Table 4 -1 . Lopez Reservoir Safe Yield
Demand from Reservoir :
Downstream Release 4 ,200
Contract Agencies 4 ,530
Annual Safe Yield 8 ,730
Dur ing the longest drought years on record in the history of Lopez Reservoir operation ,
SLOFCWCD delivered full allocations to contract agencies (24). During multiple dry years
SLOFCWCD anticipates, “based on historical expe rience… that it can meet its current contract
obligation of 4,530 AFY ” (12). Table 4 -2 and Table 4 -3 show the historic years and conditions
for average, single dry, and multipl e dry water years.
Water Code Section 10631
10631. A plan shall be adopted in accordance with this chapter and shall do all of the following:
(c) (1) Describe the reliability of the water supply and vulnerability to seasonal or
climatic shortage, to the extent practicable, and provide data for each of the
following:
(A ) An average water year.
(B) A single dry water year.
(C) Multiple dry water years.
(2) For any water source that may not be available at a consistent level of use,
given specific legal, environmental, water quality, or climatic factors,
describe plans to supplement or replace that source with alternative sources
or water demand management measures, to the extent practicable.
2010 Urban Water Management Plan Final Draft
4.0 Water Supply Reliability
City of Arroyo Grande 4 -2 11/18/2011
Table 4 -2 . Lopez Reservoir Average, Single Dry, and Multiple Dry Water Years 1
Water Year Type Base Years
Average Water Year 1991/ 1992 2
Single -Dry Water Year 1989/ 1990 3
Multiple -D ry Water Years 1969/ 1970, 1970/1971, and 1971/1972 4
1 Table adapted from the Zone 3 2010 UWMP (24) 2 Average precipitation between 1968/69 and 2009/10 is 19.1 inches. The
water year that most closely matches the av erage is 1991/92 with 19.0 inches
of rain. 3 The single driest year is 1989/90 with only 9.1 inches of rain.
4 Multiple dry water years is represented by 1969/70, 1970/71 , and 1971/72,
which had a combined rainfall of 33.1 inches.
Table 4 -3 . Lopez Reservoir Historic Conditions 1
Average/Normal Water Year
1991/1992
Single Dry Water Year
1989/ 1990
Multiple Dry Water Years 3
Year 1 1969/1970 Year 2 1970/1971 Y ear 3 1971/1972
4,530 AFY 2 4,530 4,530 4,53 0 4,530
Percent of Average/
Normal Year
100 100 100 100
1 Table adapted from the Zone 3 2010 UWMP (24)
2 The actual delivery for 1991/92 was 5,025 AFY. However, the contracted amount is 4,530 AFY. 3 As indicated earl ier, in the history of operati on of Lopez Reservoir, contract agencies have always
received water deman d requested up to full contract allocations.
Some other factors that result in inconsistency of Lopez Reservoir supply are shown in Table
4 -4 . SLOFCWCD must maintain adequate downstream releases for groundwater recharge,
agricultural uses , and protection of steelhead, red -legged frogs, and other environmentally
sensitive biota. SLOFCWCD has prepared a draft Habitat Conservation P lan (HCP) for the
Lopez Dam project to comply with the Endangered Species Act. Zone 3 operations on the
Lopez Reservoir require an incidental take authorization for covered activities while providing
enhanced habitat conditions and protection for both red -legged frogs and s teelhead.
In addition to the HCP, SLOFCWCD has prepared an Interim Downstream Release Schedule
(IDRS), which includes a Low Reservoir Response Plan (LRRP). The LRRP describes a
methodology to assess near -term reservoir levels and actions that could be taken to mitigate the
impacts of low reservoir levels of 20,000 acre -feet or less .
2010 Urban Water Management Plan Final Draft
4.0 Water Supply Reliability
City of Arroyo Grande 4 -3 11/18/2011
Table 4 -4 . Factors Resulting in Inconsistency of Lopez Reservoir Supply 1
Water
Supply Sources
Specific
So urce
Name
Limitation
Quantification (AFY)
Legal
(AFY)
Environmental
(AFY)
Water
Quality (AFY)
Climatic
(AFY)
Zone 3 Lopez
Reservoir
4,530 4,530 0 0 0
Additional Information Based on historical records, the only limiting factor to the contract agencies'
w ater supply is based on their contracted amounts, which are tied to the safe
yield of Lopez Reservoir.
1 Table adapted from the Zone 3 2010 UWMP (24)
4.2 G roundwater
According to the Department of Water Resources report p repared in 2002, the Arroyo Grande
Groundwater Basin is a stable and reliable supply . In 2007, t he Water Balance Study for
Northern Cities Area provide d a n updated analysis of the safe yield of the basin and sugges t ed
that no immediate adjustment to the ur ban allotment of 4,000 AFY wa s necessary (17).
In 2008, the groundwater level in the north -central portion of the NCMA was 10 feet below sea
level (25). There was potential for seawater intrusion in the NCMA because the area below sea
level appeared to extend to the coast (17). In 2009, elevated Chloride l ev els detected at sentry
wells indicated ev idence of seawater intrusion . According to t he NCMA 2010 Annual Monitorin g
Report , the ground water elevation ha s risen from 10 feet below sea level in the north -central
portion of the NCMA in 2008, to five feet above sea level in October 2009 (26). Even though the
ground water elevation has risen sin ce 2008, “there remains an apparent depression in the so -
called ‘pumping trough’ ” (26).
By implementing an integrated, regional approach to reduce groundwater pumping, the
Northern Cities were able to decrease groundwater p umping by 2,300 AFY or 37% from 2008 to
2010, achieve increased groundwater levels, and observe the seawater wedge retreating
offshore as evidenced by improved water quality in coastal sentry wells. The s uccessful
management strategies implemented included : 1) increased surface water use through delivery
of surplus supplies; 2) expanded conservation p rograms and customer education; 3)
negotiations to secure an emergency allocation of additional State Water Project supplies; 4)
hydraulic evaluation and maint enance of the regional conveyance infrastructure; 5) increased
groundwater monitoring; and 6) improved regional cooperation.
Building on this success, the Northern Cities have several ongoing and planned initiatives to
ensure long -term sustainability of supplies. Ongoing and future initiatives include: 1) evaluation
of a spillway raise project at Lopez dam to increase sustainable yield of local surface water
supplies and provide flood control benefits; 2) development of a groundwater model for the
Santa Maria Groundwater basin; 3) pursuit of additional permanent and emergency allocations
of State Water Project supplies; 4) enhanced conjunctive use of the groundwater basin; 5)
regional recycled water projects and potential seawater intrusion barrier; and 6 ) coordination
with regional flood control projects to benefit from enhanced seasonal groundwater recharge.
2010 Urban Water Management Plan Final Draft
4.0 Water Supply Reliability
City of Arroyo Grande 4 -4 11/18/2011
The Pismo Formation utilized by the City is thought to be relatively large . In 2003, Cleath &
Associates completed a groundwater source assessment for the Oak Park area, which covers
the same aquifer as the Pismo Formation. The groundwater yield for the Oak Park area was
estimated to be approximately 540 AFY (22). I n over 15 years of production, there has been
consistent delivery without impact to groundwater levels. However, as described in Section 4.2 ,
water from Well s No. 9 , 10, and 11 require s treatment in order to comply with Water Quality
Standards. Section 7.0 discusses water quality impacts on the City’s system.
4.3 Water Supply Reliability Analysis
The City has relied on surface water and groundwater sources for the past 35 -year period.
Some factors that affect supply reliability are legal and climatic as shown in Table 4 -5 . The legal
factors include the adjudication of the Santa Maria Groundwater Basin and the c ontractual
obligations of the Lopez Reservoir Project and OCSD Agreement. Some environmental factors
include the Endangered Sp ecies Act incidental take authorization requirements for steelhead
and red -legged frogs downstream from the Lopez Reservoir. For more information, see Section
4.1 . Some climatic factors include extended drought conditions that could affect availability of
Lopez Reservoir water, OCSD water, and Santa Maria Groundwater Basin water. Table 4 -6
shows the average, single dry, and multiple dry years supply availability based on historical
hydrologic conditions .
The conjunctive use of the groundwater basins and surface water supplies provide s an effective
management strategy, which increases the overall reliability of all the resources to meet current
and future water demands. Based on the information availa ble at this time, it is calculated that
the City currently has a safe yield estimate of 3 ,7 7 3 AFY . H owever, the addition of Well 11 by
2015 is projected to contribute at least an additional 40 AFY and the three years left on the
contract with OCSD for 10 0 AFY will be used as needed (see Section 3.4 for more information).
A breakdown of this value, along with a 20 -year projected safe yield estimate can be found in
Table 4 -7 .
Table 4 -5 . Other Factors Affecting Supply
Water Supply Sources Legal Environmental Water Quality Climatic
Groundwater:
Arroyo Grande
Basin
X X
Groundwater:
Pismo Formation X X
Lopez Reservoir
Water Entitlement X X
OC SD Agreement X X
Surplus Lopez
Water X X
2010 Urban Water Management Plan Final Draft
4.0 Water Supply Reliability
City of Arroyo Grande 4 -5 11/18/2011
Table 4 -6 . Average, Single Dry, and Multiple Dry Years
Water Supply
Sources 1
Average /
Normal Water Year
Single Dry
Water Year
Multiple Dry Water Years
Year 1 Year 2 Year 3
Groundwater: Arroyo
Grande Basin 1,323 1,323 1,323 1,323 1,323
Groundwater: Pismo
Formation 160 160 160 160 160
Lopez Reservoir
Water Entitlement 2,290 2,290 2,290 2,290 2,290
OCSD Agreement 2 0 0 0 0 0
Surplus Lopez Wa ter 0 0 0 0 0
Total Water Supply 3,773 3,773 3,773 3,773 3,773
% of Normal 100% 100% 100% 100% 100%
1 The basis of water supply for an average year is 19 5 7 . A single dry weather year occurred in 1989,
where the total precipitation measured 5 .5 inches. A multiple dry year period occurred from 19 8 8 through
1990 (27). 2 The City has a contract with OCSD for 100 AFY for five years. The City has not purchased water for
three of those years. It is assumed that the remaining three y ears will be used during dry years; however
there may be multiple dry years after the next three dry years when the OCSD supply is not available.
Thus, the OCSD supply is not shown in this table.
Table 4 -7 . Arroyo Grande Projected Supply Reliability (AFY)
Year 2010 2015 2020 2025 2030
Lopez Reservoir 2,290 2,290 2,290 2,290 2,290
Groundwater: Arroyo Grande Basin 1,323 1,323 1,323 1,323 1,323
Groundwater: Pismo Formation 80 200 200 200 200
OCSD Agreement 1 100 100 0 0 0
Total 2 3,793 3,913 3,813 3,813 3,813
1 It is assumed t he City will amend its five -year contract with OCSD to use its remaining 3 years of annual
purchases of 100 AFY in 2014, 2015, and 2016 . 2 The basis of water supply for an average year is 19 5 7 . A single dry weather year occurred in 1989,
where the total precipitation measured 5 .5 inches. A multiple dry year period occurred from 1988 through
1990 (27).
2010 Urban Water Management Plan Final Draft
4.0 Water Supply Reliability
City of Arroyo Grande 4 -6 11/18/2011
4.3.1 T hree -Year Worst Case Water Supply
During periods of ext ended drought, the City could conceivably receive a reduced surface water
allocation from the Lopez Project. However, current reservoir levels will allow the normal
allocation to be obtained over the next three years.
Table 4 -8 . Minimum Available Water Supply (AFY)
Source Three -Year Worst -Case Supply
2011 2012 2013
Groundwater: Arroyo Grande Basin 1,323 1,323 1,323
Groundwater: Pismo Formation 1 160 160 160
Lopez Reservoir Water Entitlement 2,290 2,290 2,290
OCSD Agreement 2 100 100 100
Surplus Lopez Water 0 0 0
TOTAL 3,873 3,873 3,873
1 Assumes that 8 0 AFY will be available by 2011 from Well No. 10.
2 Assumes that the remaining three years of the five year contract of 100 AFY with OCSD will be ut ilized
during the next three driest three years.
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -7 11/18/2011
5.0 W ater Use
Water Code Section 10631
10631. A plan shall be adopted in accordance with this chapter and shall do all of the following:
(e) (1) Quantify, to the extent records are available, past and current water use, over
the same five -year increments described in subdivision (a), and projected
water use, identifying the uses among water use sectors, including, but not
necessarily limited to, all of the following uses:
(A) Single -family residential.
(B) Multifamily.
(C) Commercial.
(D) Industrial.
(E) Institutional and governmental.
(F) Landscape.
(G) Sales to other agencies.
(H) Saline water intrusion barriers, groundwater recharge, or conju nctive use,
or any combination thereof.
(I) Agricultural.
(2) The water use projections shall be in the same five -year increments described
in subdivision (a).
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -8 11/18/2011
5.1 H istorical Water Use
Table 5 -1 outlines overall historical water use for the City from 1987 to 20 10 .
Table 5 -1 . Hi storical Water Demand
YEAR TOTAL PRODUCTION (AFY )
TOTAL METERED CONSUMPTION (AFY )
NRW (AFY ) NRW (%) ESTIMATED POPULATION 1
PRODUCTION PER CAPITA (gpcd)
TOTAL RAINFALL (in)2
1987 2,891 2,830 61 2.1% N/A N/A 9.7
1988 3,027 2,997 30 1.0% 13,750 197 13.5
1989 2,938 2,785 153 5.2% 14,090 186 5.5
1990 2,922 2,755 167 5.7% 15,150 172 5.6
1991 2,665 2,484 181 6.8% 14,600 163 20.4
1992 2,662 2,533 129 4.8% 14,650 162 14.9
1993 2,747 2,600 147 5.4% 15,070 163 16.7
1994 2,702 2,487 215 8.0% 15,146 159 12.5
1995 2,628 2,585 43 1.6% 15,500 151 20.9
1996 2,795 2,739 56 2.0% 15,495 161 28.3
1997 3,087 3,021 66 2.1% 15,495 178 13.0
1998 2,766 2,567 199 7.2% 15,776 157 27.3
1999 3,173 2,983 190 6.0% 16,007 177 12.6
2000 3,384 3,231 153 4.5 % 15,851 191 18.5
2001 3,303 3,210 93 2.8% 16,115 183 19.7
2002 3,503 3,353 150 4.3% 16,294 192 10.5
2003 3,517 3,458 59 1.7% 16,623 189 10.9
2004 3,594 3,490 104 2.9% 16,637 193 13.7
2005 3,415 3,204 210 6.2% 16,682 183 17.7
2006 3,324 3,037 287 8.6 % 16,669 178 19.9
2007 3,590 3,272 317 8.8% 16,859 190 8.2
2008 3,513 3,373 140 4.0% 17,136 183 14.6
2009 3,256 3,063 193 5.9% 17,080 170 11.6
2010 2,956 2,782 174 5.9% 16,901 156 32.6
1 Source: DWR Public Water System Statistics Reports (1994 -2010) a nd the City’s 2005 UWMP (1987 -1993).
2 Source: City of Arroyo Grande Corp Yard Gauge #177.1 (1987 -2010)
After 1990, the City began tracking water use according to customer type. Table 5 -2 and Table
5 -3 outline the City’s historical water use by specific category for 2005 and 2010 .
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -9 11/18/2011
Table 5 -2 . Historical Water Use by Category 2005 (AFY)
2005
Metered
Not Metered
Total
Water use sectors # of
Conn ections Volume # of
Connections Volume Volume
Single family 5,577 2,308 0 0 2,308
Multi -family 107 288 0 0 288
Commercial 388 385 0 0 385
Industrial 0 0 0 0 0
Institutional/ governmental 105 32 0 0 32
Landscape 46 192 0 0 192
Agriculture 0 0 0 0 0
Other 0 0 0 0 0
Total 6,223 3,205 0 0 3,205
Table 5 -3 . Historical Water Use by Category 2010 (AFY)
20 10
Metered
Not Metered
Total
Water use sectors # of
Connections Volume # of
Connections Volu me Volume
Single family 5,801 2,031 0 0 2,031
Multi -family 107 278 0 0 278
Commercial 398 278 0 0 278
Industrial 0 0 0 0 0
Institutional/ governmental 49 84 0 0 84
Landscape 118 111 0 0 111
Agriculture 0 0 0 0 0
Other 0 0 0 0 0
Total 6,473 2,782 0 0 2,782
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -10 11/18/2011
5.2 C ustomer Types
The following is a brief description of the various water customer types found within the City.
5.2.1 Residential Sector
Residential water use accounts for 8 3% of the total water consumption in the City. In 20 10 , the
average use for ea ch single family residence was 312 gallons per day. The average residential
(single and multiple family) per capita use, excluding other water use categories, has decreased
by approximately 10% from 2000 to 2010 .
In accordance with the City’s General Plan Update, the population of the City is expected to
increase to 20,000 over the next twenty to twenty five years. When compared to the existing
residential areas, it is anticipated that future growth will be redistributed to the City’s mixed -use
and hi gher density residential areas. Based on project submittals over the past two years, as
well as projected development, the recent and foreseeable trend for new residential
development is in the form of higher density, mixed use infill and redevelopment, cl ustered
subdivision, small -lot planned unit development and condominiums. As a result, conservation
efforts are expected to reduce per capita usage. Projected residential water use can be found in
Table 5 -5 , Table 5 -6 , and Table 5 -7 .
5.2.2 Commercial Sector
In 2001, the City re -designated a significant portion of the City’s commercial corridors from
general commercial to mixed use, allowing for the potential increase in multi -family and single
family planned unit development density in these areas. The City has a variety of existing
commercial and mixed use land uses including the following general areas:
The Arroyo Grande Village – Village Core Downtown and Village Mixed Use districts.
The Village area has a small -town, rustic nature and includes such commercial uses as
antique and novelty shops, restaurants, coffee houses, professional offices, and other
small retail operations and allows for residential use.
Highway 101 and E. Grand Ave. Corridor - Gateway Mixed Use/Fair Oaks Mixed
Use/Highway Mixed Use districts. This area includes larger retail installations for
general shopping and commercial needs and allows for a variety of higher density
residential uses.
Halcyon Road – Office Mixed Use district. This area has predominantly medical -related
businesses due to the proximity to Arroyo Grande Hospital and allows for a mix of office
and residential use.
Traffic Way – Traffic Way Mixed use district – This area has predominantly auto -re lated
and service commercial uses.
El Camino Real – Miscellaneous fabrication and small production facilities, and a
hardware store.
Five Cities Center – This area includes large retail operations for regional shopping.
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -11 11/18/2011
5.2.3 Industrial Sector
There are current ly no industrial water connections in the City system. The City does not have
any vacant land zoned for industrial use.
5.2.4 Institutional/Government Sector
The City ’s institutional/government sector consists primarily of local government, elementary
schools, a middle school and high school, and a performing arts center. W ater use is not
estimated to increase significantly for the institutional /government sector.
5.2.5 Agricultural Sector
All agricultural water within the City limits is provided by private wells. Th e City places a high
value on maintaining agricultural land uses within and immediately adjacent to the City and as a
result, it is expected that agricultural groundwater pumping within the City will remain fairly
constant over the next 20 years. However, potential agricultural conversions outside the City as
well as modified irrigation practices may cause a decrease in the amount of water pumped for
irrigation.
5.2.6 Low -Income
Changes to the California Water Code section 10631.1 since 2005 require demand projec tions
to include projected water use for single -family and multi -family residential housing needed for
lower income households. Low -income households are defined as households making less than
80% of mean income within a given geographic area of the state adjusted for family size and
revised annually.
The San Luis Obispo Council of Governments Regional Housing Needs Plan (10) identifies 14 1
low and very low income housing units needed for the City to meet its share of low incom e
housing units from 2007 through 2015 . The estimated residential per connection water demand
in 2010 wa s 0.39 AFY. Using the 2010 residential per connection demand, 55.11 AFY will be
needed to supply these projected lower income housing units. Water deman ds for these units
are included in future water demand projecti ons for single family and multi -family residential
connections listed in the Section 5.2 .
5.3 P er Capita Water Use
The calculation of SB7 bas e daily and target per cap ita water use is discussed in detail in
Appendix E . Table 5 -4 shows the base daily , compliance, interim target, and target per capita
water use for the City . Figure 5 -1 displays the base daily and targets as well as historical and
projected per capita water use. Projections incorporate ongoing and future water conservation
efforts to reflect a reduced per capita usage as required by SB7.
Table 5 -4 . Base daily , Compliance, Interim Target, and Target Water Use
Parameter Water Use (gpcd)
Base Daily Per Capita Water Use 186
2010 Daily Per Capita Water Use 156
2015 Interim Urban Water Use Target 167
2020 Urban Water U se Target 149
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -12 11/18/2011
Figure 5 -1 . Historical, Current, and Projected Per Capita Water Use
5.4 P rojected Water Use
According to the General Plan update (October 2001) and as amended by the Housing Element
(2003 and 20 05), the anticipated build -out population of the City is 20,000 residents as
described in Section 2.2 . In order to appropriately prepare for adequate water supplies for future
residents of the City, the estimated projected wate r demands must be determined.
Demand projections were developed by applying the following methodology:
1. Calculate SB7 Base daily and Targets. The base daily , compliance, interim target, and
target per capita water use for the City’s service area were cal culated in compliance with
SB7 requirements. Appendix E describes how these per capita numbers were
calculated.
2. Estimate population growth rates. Population projections and annual growth rates
were calculated base d on SLOCOG’s population projections for the City through 2040 in
its San Luis Obispo County 2040 Population, Housing & Employment Forecast (11).
3. Estimate 2010 population. The 2010 estimate is based upon 2010 census data . The
Census population is adjusted by factoring in an allotment of 2.4 persons per residential
connection located within City limits not served by the City and connections outside of
City Limits that are served by the City.
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -13 11/18/2011
4. Develop population projectio ns through 2030. Annual growth rates calculated in step
2 are applied to the 2010 population to calculate annual population estimates through
2030 .
5. Develop total demand projections. T he Interim Target gpcd is applied to the projected
population in 2015 to estimate demand. T he Target gpcd is applied to the estimated
projected population in 2020, 2025 and 2030 to estimate demand. It is assumed that the
low gpcd experienced in 2010 is a result of multiple temporary factors, such as the
economy, wet year hydrol ogic conditions, and others , in addition to successful
conservation efforts by the City . To account for th e temporary factors, it is assumed that
the 2011 gpcd will be equal to the five -year historical average gpcd from 2006 -2010.
Per capita demands for t he years 2012 -2014 are then estimated based on a straight line
interpolation to the 2015 interim target , and reflect ongoing water conservation efforts by
the City.
Each water use sector is projected to grow at the same annual growth rate as the population ,
with consideration of the reductions in per capita demand through 2020 as described above .
Projected water demand for 20 15 to 20 30 can be found in Table 5 -5 , Table 5 -6 , and Table 5 -7 .
Table 5 -5 . Projected Water Use by Category 2015 (AFY)
2015
Metered
Not Metered
Total
Water use sectors # of
Connections Volume # of
Connections Volume Volume
Single family 6,025 2,280 0 0 2,280
Multi -family 111 312 0 0 312
Commercial 413 312 0 0 312
Industrial 0 0 0 0 0
Institutional/ governmental 51 94 0 0 94
Landscape 123 125 0 0 125
Agriculture 0 0 0 0 0
Other 0 0 0 0 0
Total 6,723 3,123 0 0 3,123
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -14 11/18/2011
Table 5 -6 . Projected Water Use by Category 2020 (AFY)
2020
Metered
Not Metered
Total
Water use sectors # of
Connections Volume # of
Connections Volume Volume
Single family 6,159 2,072 0 0 2,072
Multi -family 114 284 0 0 284
Commercial 423 284 0 0 284
Industrial 0 0 0 0 0
Institutional/ governmental 52 85 0 0 85
Landscape 125 113 0 0 113
Agriculture 0 0 0 0 0
Other 0 0 0 0 0
Total 6,872 2,838 0 0 2,838
Table 5 -7 . Project ed Water Use by Category 2025 & 2030 (AFY)
2025 2030
Metered
Not Metered
Water use sectors # of
Connections Volume # of
Connections Volume
Single family 6,368 2,142 6,548 2,203
Multi -family 117 294 121 302
Commercial 437 293 449 302
Industri al 0 0 0 0
Institutional/ governmental 54 88 55 91
Landscape 130 117 133 121
Agriculture 0 0 0 0
Other 0 0 0 0
Total 7,105 2,934 7,306 3,017
Figure 5 -2 represents the division of water use by category in 2010 .
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -15 11/18/2011
Figure 5 -2 . Water Use by Sector
5.5 N on -Revenue Water Use
Between the years 19 94 and 20 10 , non -revenue water averaged 4 .9 %. It is assumed that the
percentage of non -revenue water from 2010 through 2030 will be 5% of gross water use. Table
5 -8 shows historical and projected non -revenue water use.
Table 5 -8 . Non -Revenue Water - AFY
Water use 2005 2010 2015 2020 2025 2030
Non -revenue water
(NRW ) 210 1 73 164 149 154 159
5.6 T otal Water Use
The historical and projected total water use including customer deliveries and NRW is shown in
Table 5 -9 .
Table 5 -9 . Total Water Use - AFY
Water use 2005 2010 2015 2020 2025 2030
Total Water
Deliveries 3,205 2,782 3,123 2,838 2,934 3,017
Non -r evenue water
(NRW) 210 173 164 149 154 159
Total Water Use 3,416 2,956 3,288 2,987 3,089 3,176
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -16 11/18/2011
5.7 W ater Shortage Contingency Plan
Following the adoption o f the May 2001 Urban Water Management Plan, the City adopted a
water conservation program (see A ppendix C ) in May 2003 , which directed preparation of a
water shortage contingency analysis, in compliance with State Water Code Secti on 10632. The
Mandatory Water Conservation Measures were updated and adopted in May 2011. The
following is a description of the City’s conservation program.
Water Supply Conditions
The City implements mandatory conservation measures at all times, except d uring critical water
supply conditions. During critical supply conditions the City Council may adopt a resolution
Water Code Section 10632
10632. The plan shall provide an urban water shortage contingency an alysis which
includes each of the following elements which are within the authority of the urban
water supplier:
(a) Stages of action to be undertaken by the urban water supplier in response to
water supply shortages, including up to a 50 percent reductio n in water supply,
and an outline of specific water supply conditions which are applicable to each
stage.
(b) An estimate of the minimum water supply available during each of the next three
water years based on the driest three -year historic sequence for the agency's
water supply.
(c) Actions to be undertaken by the urban water supplier to prepare for, and
implement during, a catastrophic interruption of water supplies including, but not
limited to, a regional power outage, an earthquake, or other disaste r.
(d) Additional, mandatory prohibitions against specific water use practices during
water shortages, including, but not limited to, prohibiting the use of potable water
for street cleaning.
(e) Consumption reduction methods in the most restrictive stag es. Each urban water
supplier may use any type of consumption reduction methods in its water
shortage contingency analysis that would reduce water use, are appropriate for its
area, and have the ability to achieve a water use reduction consistent with up t o a
50 percent reduction in water supply.
(f) Penalties or charges for excessive use, where applicable.
(g) An analysis of the impacts of each of the actions and conditions described in
subdivisions (a) to (f), inclusive, on the revenues and expenditures of the urban
water supplier, and proposed measures to overcome those impacts, such as the
development of reserves and rate adjustments.
(h) A draft water shortage contingency resolution or ordinance.
(i) A mechanism for determining actual reductions in water use pursuant to the
urban water shortage contingency analysis.
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -17 11/18/2011
declaring a critical water supply condition, which would determine additional mandatory
conservation measures . A catastrophic loss of greater than 50 percent of the City’s water supply
would result in a critical water supply condition and subsequent measures w ould be taken as
described in Chapter 13.05.040 of the Municipal Code. The current water supply stages and
conditions are shown in Table 5 -10 . Mandatory conservation measures can be viewed in
Chapter 13.05 of the City’s Municipal Code posted at www.municode.com .
Table 5 -10 . Wate r Rationing Stages and Conditions
Stage No. Water Supply Conditions % Shortage
1 Normal 0%
2 Critical 50 %
The following water conservation requirements are effective at all times, except during critical
water supply conditions as outlined in Section 13.05.040 of the City’s Municipal Code. Violations
of the municipal code shown below are considered waste and an unreasonable use of water.
Penalties for noncompliance are listed in Sections 13.05.050 and 13.05.060 of the City’s
Municipal Code.
13.05.030 - Water conservation requirements
A. Use of Water which results in excessive gutter runoff is prohibited.
B. Outdoor Water Use - Except Irrigation.
1. No water shall be used for cleaning driveways, patios, parking lots, sidewalks,
streets or other such use except w here necessary to protect public health and
safety.
2. Outdoor water use for washing vehicles shall be attended and have hand -
controlled watering devices.
C. Outdoor Irrigation.
1. Outdoor irrigation is prohibited between the hours of ten a.m. and four p.m.
2. Irriga tion of private and public landscaping, turf areas and gardens is permitted at
even -numbered addresses only on Mondays and Thursdays and at odd -
numbered addresses only on Tuesdays and Fridays. No irrigation of private and
public landscaping, turf areas and gardens is permitted on Wednesdays.
Irrigation is permitted at all addresses on Saturdays and Sundays however, in all
cases customers are directed to use no more water than necessary to maintain
landscaping.
D. Emptying and refilling swimming pools and comm ercial spas is prohibited except to
prevent structural damage and/or to provide for the public health and safety.
E. Use of potable water for soil compaction or dust control purposes in construction
activities is prohibited unless specifically approved by th e City.
13.05.040 – Critical water supply condition
A. A critical water supply condition is defined as consuming one hundred (100) percent of
the annually available water supply. The city council may adopt a resolution declaring a
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -18 11/18/2011
critical water supply cond ition, which would determine additional mandatory water
conservation measures in effect at any particular time within the city.
B. The following water restrictions and measures shall be in effect during critical water
supply conditions:
1. Outdoor irrigation of private or public landscaping, turf areas and gardens using
potable water is prohibited.
2. Outdoor water use for washing vehicles is prohibited except at a public car wash
facility.
3. The city council may also impose any water -rationing requirements as it dee ms
appropriate to protect public health, safety, welfare, comfort and convenience.
C. Upon adoption of the required resolution, the restrictions and measures identified in the
chapter shall take effect immediately.
Table 5 -11 . Consumption Reduction Methods for Critical Supply Stage
Consumption Reduction Methods Stage when Method
Takes Effect
Projected Reduction
(%)
Outdoor Irrigation of Private or Public Landscaping, turf areas and
gardens are prohibited .
2 4 8%
Outdoor water use for washing vehicles is prohibited except at a
public car wash . Use of potable water for compaction or dust
control purposes in construction activities is prohibited. Emptying
and refilling swimming pools and commercial spas is prohib ited
except to prevent structural damage and/or to provide for the public
health and safety. No water shall be used for cleaning driveways,
patios, parking lots, sidewalks, streets or other such use except
where necessary to protect the public health and s afety. Use of
water, which results in excessive gutter runoff, is prohibited
2 2%
R esidential water use accounts for 8 3 % of the City’s total water consumption. Based on sanitary
sewer collection system flows, the City estimates that approximately 60% of residential water
use is for outdoor/irrigation purposes. In the event of a water shortage, including up to a 50
percent reduction in water supply, the City would declare a Critical Water Supply Condition.
Under this condition, water use for irrigation wou ld be prohibited, which would result in
approximately a 49.8 percent decrease in water consumption. Combined with the additional
restrictions imposed during this condition, the City expects that the water consumption could be
reduced by 50 percent while s till providing for customer’s health and sanitary needs.
Minimum Available Water Supply
Section 5.7 discusses the analysis of the minimum available water supply projections for the
next three years. As will be discussed in the next section, the City could receive a reduced
Lopez surface water allocation in the event of a drought; however, current reservoir levels will
allow for normal allocation for the next three years. Based on Lopez availability, and the
reliability of groun dwater supplies, the minimum available supply is estimated in Table 5 -12 .
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -19 11/18/2011
Table 5 -12 . Minimum Available Water Supply
Source Three -Year Worst -Case Supply
2011 2012 2013
Groundwate r: Arroyo Grande Basin 1,323 1,323 1,323
Groundwater: Pismo Formation 1 160 160 160
Lopez Reservoir Water Entitlement 2,290 2,290 2,290
OCSD Agreement 2 100 100 100
Surplus Lopez Water 0 0 0
TOTAL 3,873 3,873 3,873
1 Assumes that 8 0 AFY will be avail able by 2011 from Well No. 10.
2 Assumes that the remaining three years of the five year contract of 100 AFY with OCSD will be utilized
during the driest three years.
Catastrophic Water Supply Interruption
In the event of a sudden and catastrophic loss of water supply, the City has written an
Emergency Response Plan (ERP ) (28) to guide the City ’s employees during disasters such as
earthquakes, floods, wild land fires, dam failures , and terrorism. In addition to the emergency
r esponse guidelines established for City personnel, the Plan includes a Memorandum of
Understanding between cities within San Luis Obispo County to offer assistance as available to
neighboring cities during time of disaster.
The ERP contains detailed actio n items to the following list of events that might result in a
drastic loss in supply.
1. Structural Damage from an Explosive Device
2. Power Outage
3. Natural Event (Flood)
4. Natural Event (Winter Storm)
5. Natural Event (Hurricane/Tropical Storm)
6. Natural Event (Eart hquake)
In the event of a power outage, the City ’s response strategy is to first determine if the reason for
the outage is local to the plant or regional, then estimate the time to return power. This will
provide the City with the significance of the situa tion and will help assess the need to secure
additional fuel for generators. The treatment process would be operated to minimize the effects
of the power loss. The problem should be remedied as quickly as possible, however, if the
supply cannot be returned and an eventual loss of supply occurs, customers shall be notified of
how to proceed.
The first response in the event of an earthquake is to perform a system audit to determine the
extent of damage to utilities, piping, and processes. This audit will al low the City to concentrate
staff and resources on issues that need to be addressed immediately. Additional staff will be
required for sampling, analysis, equipment repair, manual equipment and process operation,
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -20 11/18/2011
and communication. A report of the damage w ill be issued to the Incident Commander followed
by a list of supplies that are necessary for repairs.
In the event of an emergency that interrupts use of a surface water source, the City will be able
to provide an average flow of 300 gallons per capita per day from the City well water.
Penalties or Charges for Excessive Use
In March 2006, a tiered water rate structure w as implemented to discourage excessive water
use. Please refer to Section 6.11 for more information about the City’s conservation rates .
Chapter 13.05 of the City’s Municipal Code outlines penalties for noncompliance with excessive
use during the four water supply conditions discussed previously. Violation of any provision of
Chapter 13.05 may result in termi nation of water service until such violation is corrected, and
until penalties are paid in full and will be subject to the following administrative procedure:
1. Written notice to the alleged offender, including the furnishing of informational material
and a dvice where appropriate;
2. Recovery of all city staff costs, including overhead, for any second or greater offense
within any one -year period;
3. Additional civil administrative penalties for any third or greater offense within any one -
year period;
4. The right to appeal first to the utility billing adjustment committee and then to the city
council
In addition to, and completely separate from, the civil enforcement provisions of the ordinance
codified in Chapter 13.05 , any person who knowingly and willfully violate s the pro visions of
Chapter 13.05 shall be guilty of a criminal misdemeanor as provided in the general penalty
provisions of this code. All previous attempts by the city to obtain compliance by the defendant
may be introduced as evidence of the offender's knowledge and willfulness.
Revenue and Expenditure Impacts
The intent of the restrictions enforced under each of the Water Supply Conditions is to reduce
water consumption. The City recognizes that as a result of the reduced water consumption
under all co nditions besides a Normal Water Supply Condition, revenue from water sales will
decline. It is possible that during a Critical Water Supply Condition, revenues could be reduced
by as much as 50 percent. While revenues may decline, operations and maintenanc e costs will
not decline because of reduced water consumption.
The City’s current rates are set to provide for a reserve fund as well as coverage of 60 days of
operations and maintenance expense. In the case of a prolonged reduction of water revenues,
the City could offset reduced revenues (up to a 50 percent reduction) with available fund
balances, for a period of two years assuming no change in operating and capital expenditures.
In the case of an extended Critical Water Supply Condition, the City could delay capital
improvements (both routine and non -routine) to reduce expenses, enabling the offset of reduced
revenues for a period of three years. Should a critical water shortage extend beyond three
years, the consideration of a rate increase would be req uired.
Mechanism for Determining Water Use Reduction
Potable water production figures are recorded daily at the City Corporation Yard. The daily data
is compiled into monthly reports and sent to the State Department of Public Health and annual
2010 Urban Water Management Plan Final Draft
5.0 Water Use
City of Arroyo Grande 5 -21 11/18/2011
reports sen t to the California Department of Water Resources and San Luis Obispo County. The
City also maintains copies of all reports prepared. These reports can be used to compare
monthly and annual water consumption to determine the efficiency of implemented water
conservation measures. If the City determines that the desired level of water conservation is not
being reached, additional conservation measures can be implemented with the direction of City
Council.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -1 11/18/2011
6.0 W ater Conservation
The City implemented a phase d water conservation program, including demand management
measures (DMM s ), in 2003. It is the goal of the City to reduce the per capita water use to 1 49
gpcd by 2020 . In 20 10 , per capita water use was 1 56 gpcd . Continued implementation of DMMs
will be moni tored by City staff to determine future impacts on per capita water use.
Water Code Section 10631
10631. A plan shall be adopted in accordance with this chapter and shall do all of the following:
(f) Provide a description of the supplier's water demand mana gement measures. This
description shall include all of the following:
(1) A description of each water demand management measure that is currently
being implemented, or scheduled for implementation, including the steps
necessary to implement any proposed measures, including, but not limited to,
all of the following:
(A) Water survey programs for single -family residential and multifamily
residential customers.
(B) Residential plumbing retrofit.
(C) System water audits, leak detection, and repair.
(D) Meter ing with commodity rates for all new connections and retrofit of
existing connections.
(E) Large landscape conservation programs and incentives.
(F) High -efficiency washing machine rebate programs.
(G) Public information programs.
(H) School education prog rams.
(I) Conservation programs for commercial, industrial, and institutional
accounts.
(J) Wholesale agency programs.
(K) Conservation pricing.
(L) Water conservation coordinator.
(M) Water waste prohibition.
(N) Residential ultra -low -flush toilet replace ment programs.
(2) A schedule of implementation for all water demand management measures
proposed or described in the plan.
(3) A description of the methods, if any, that the supplier will use to evaluate the
effectiveness of water demand management meas ures implemented or
described under the plan.
(4) An estimate, if available, of existing conservation savings on water use
within the supplier's service area, and the effect of the savings on the
supplier's ability to further reduce demand.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -2 11/18/2011
The Water Conservation Program consists of plumbing retrofit, irrigation system assessment,
enforcement of City water conservation regulations, washing machine rebates, public
info rmation and education programs , and irrigation system improvements or landscape
modifications.
6.1 W ater Survey Programs for Single -Family Residential and Multi -
Family Residential Customers
City staff provides leak detection information and assistance to res idents. S taff monitors meter
readings for discrepancies or variations in historic use and will inform and assist residents of
potential leaks. Staff also routinely performs leak detection surveys upon request. The City’s
website includes up -to -date informa tion on the City’s water conservation programs and
residents are encouraged to contact the City for questions regarding water use.
A service request database is maintained regarding the number of residents assisted and the
number of surveys performed. I t is estimated that twenty -five leaks are detected per year for
residential connections.
The City does imple ment an irrigation water audit s urvey program , a turf replacement program,
and a smart irrigation controller program which are discussed in furth er detail in S ection 6.5 .
6.2 R esidential Plumbing Retrofit
The first phase of the City’s Water Conservation Program includes the Plumbing Retrofit
Program, which was implemented in 2004. Program marketing includes retrofit reques t forms
sent to all single -family homes built prior to 1992. In addition , City staff door -tagged each
property that did not respond to the survey. Furthermore, announcements were sent in the
City’s utility bills, on the City’s website , and in the City’s qu arterly newsletter the Stagecoach
Express .
The City has a contracted plumber to retrofit fixtures for residents. The City provides labor and
materials for replacement of toilets, showerheads, faucet aerators, and pressure regulators that
are installed o r adjusted as required. The City currently has satisfied the 75% saturation
requirement for single -family and multi -family housing units . Funding for the Plumbing Retrofit
Program is derived from the City’s Water Neutralization Fund, which has been develop ed to
offset increased water use by allowing a developer to pay in lieu fees instead of performing
plumbing retrofits for toilets. Table 6 -1 includes statistics for the evaluation of the plumbing
retrofit program.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -3 11/18/2011
Table 6 -1 . Cost and Savings of Water Saving Devices
2004 -2011 Total Cost ($) Savings (AFY)
Number of showerheads
Installed 1 1,732 $ 17,320 10.68
Number of Aerators
Installed 2 3,790 $ 18,950 6.3 7
Number o f pressure
regulators Installed 3 355 $ 42,600 n/a
Number of Ultra Low
Flow Toilets Installed 4 4,011 $ 902,475 139.26
Program Costs, Staff
Time, and Labor N/A $ 53,735 N/A
TOTAL EXPENDITURES $ 1,035,080 ACTUAL WATER SAVINGS 156
1 Cost assumed to be $10 per showerhead. Savings Assumed to be 5.5 gallons per day. Source: (29)
2 Cost assumed to be $5 per aerator. Savings Assumed to be 1.5 gallons per day. Source: (29)
3 Cost assumed to be $12 0 per regulator. Savings are not estimated because regulators are only installed
to support other water saving devices. 4 Cost assumed to be $22 5 p er toilet. Savings assumed to be 31 gallons per day. Sour ce: (30)
In 2005 the City adopted an ordinance for a mandatory plumbing retrofit program applicable to
the resale of property. These regulations can be found in Chapter 13.06 of the City’s Municipal
Code.
6.3 D istribution System Water Audits and Leak Detection Repair
The City accounts for water production and consumption and reports results to the California
Department of Water Resources each year. The City maintains an on -going program of meter
testing and replacement that trac k s the age and testing frequency of each city meter. Water for
flushing operations and other maintenance procedures is also estimated and recorded.
Between the years 19 94 and 20 10 , non -revenue water has averaged 4 .9 %. Additionally, the
City repairs all water main and service leaks upon notification or detection. The City also uses
ultrasonic leak detectors to survey water mains and services. In conjunction with this DMM, the
City has an ongoing funded Capital Improvement Program that replaces older wate r mains and
services.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -4 11/18/2011
6.4 M etering with Commodity Rates and Retrofit of Existing
Connections
All water service connections to the City are metered, and billing is proportional to volume of
use. The City currently has 6,473 connections.
6.5 L arge Landscape W ater Conservation Programs and Incentives
This DMM was implemented in January 2009. The City has 1 18 dedicated irrigation water
meters. Currently, these irrigation meters do not have water budgets. As a financial incentive to
install an irrigation water me ter, the meter is not subject to City sewer charges.
Large landscape users within the City include the Lucia Mar unified School District, seven parks,
a sports complex, and the Arroyo Grande District Cemetery. Following the 1985 UWMP, the
City identifie d the Soto Sports Complex as a significant irrigation water user and proceeded with
a storm water reclamation project for irrigation of the site, as described in Section 6.17 . This
storm water project has resulted in a decrease in water use by 100 AFY. Currently, the Lucia
Mar Unified School District is the largest irrigation customer with an average consumption of
approximately 30 AFY .
As part of the City’s Water Conservation Program, the City will provide assistance on impr oving
water irrigation efficiency and modifications, such as the replacement of sprinkler irrigation with
drip irrigation. Additionally, the City will provide financial incentives by supplying irrigation
system assessments for the top water users. The City has provided irrigation audits and
recommendations to the following high volume users: Wildwood Ranch Home Owners
Association, Strother Park, Rancho Grande Park, Arroyo Grande Cemetery District, Saint
Patrick’s Church, Saint Patrick’s School, Sunrise Terr ace Home Owners Association, Lucia Mar
Unified School District Paulding School and Ocean View School, Vista Del Mar Home Owners
Association, the 5 -Cities Center, and the K -Mart Shopping Center.
The City is currently finalizing a new landscape ordinance . Currently, all new development
projects are required to mitigate for water impacts by providing native and drought resistant
landscaping, installing irrigation systems that are automated, and including low flow head and
drip irrigation, and limiting use of landscaping which uses high water demand.
The City currently implements a Smart Irrigation Controller Program and Cash for Grass Rebate
Program. As part of the Smart Irrigation Controller Program, the City surveys and completes an
irrigation audit repo rt for each customer who requests a smart irrigation controller. Since
inception of the Smart Irrigation Controller Program in 2009, the City has completed 48
residential and 11 commercial/institutional surveys. The City issues the appropriate type of
irri gation controller based on the individual situation. The City also provides turf inspections and
rebates for qualified customers. Since 2009, the City has inspected and issued rebates to 129
customers for 2,605,734 square feet of grass replaced . Based on a n audit of the first 38
properties to complete the Cash for Grass Program, estimated water demand reduction equals
18 gallons per square foot per year . Based on the savings of 18 gallons/square foot the District
estimates it saves approximately 8 AFY.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -5 11/18/2011
6.6 H ig h -Efficiency Washing Machine Rebates Program
The City has implemented this DMM since January 2009. The City currently provides rebates
for high -efficiency washing machines to its customers. Rebates are based on a tiered list of
qualifying models and are se t at $100 for Tier 2 washing machines and $150 for Tier 3 washing
machines. The tiered rate system is concurrent with Pacific Gas and Electric’s (PG&E) rating
system (see www.waterenergysavings.com ). In con junction with this effort, PG&E and Southern
Gas Company both currently offer rebates of up to $75 for installation of a high -efficiency
washing machine. Table 6 -2 shows the number of rebates to date.
Table 6 -2 . Washing Machine Rebates
Washing Machine Tier Rebate Amount # of Rebates Total Rebates
Distributed
2 $ 100 9 $900
3 $ 150 62 $9 ,300
Table 6 -3 shows the estimated annual water savin gs for the washing machine rebates
distributed to date.
Table 6 -3 . High -Efficiency Washing Machine Water Savings
# of Rebates
Conventional Unit
Annual Water
Consumption
(gal/year)1
Energy Star Unit
Annual Water
Consumption
(gal/year)1
Annual Water
Consumption
Savings (gal/year)
71 12,179 5,637 464,482
1 Source: Energy Star Clothes Washer Calculator (31). Note that Energy Star qualified washing machines
do not always meet Tier 2 and Tier 3 specifications as required to qualify for a rebate. Thus, the
estimated water savings for a Tier 2 or 3 could be greater.
6.7 P ublic Information
The City has a forum to promote water conservation in its newsletter entitled “The Stage Coach
Express .” The newsletter provides an opportunity to inform the public on conservation efforts,
retrofit opportunities, and new City conservation policies. In 2004 and 2005, the City sent out
informational brochures on water conservation with utility bills, shown b elow in Figure 6 -1 and
Figure 6 -2 .
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -6 11/18/2011
Figure 6 -1 . Water Conservation Brochure
Figure 6 -2 . Water Conservation Brochure Continued
The City is developing a landscape design tool on its website using GardenSoft software, which
will allow customers to design their landscapes using water conserving plants.
The City put on a Sustainable Landscape Seminar Series (2009), which focused on sustainable
landscape principles and water conservation. These seminars were repeated on the local public
access channel and are still available at the library.
All water bills sh ow water usage in comparison to the previous year ’s usage. The City’s website
includes up -to -date information on the City’s public outreach efforts . Other opportunities for
public involvement will occur as an integral part of this Plan. The City will conti nue to implement
this demand management measure to keep the public aware of the importance of conservation.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -7 11/18/2011
6.8 S chool Education
The City has budgeted $5,000 to implement a school education program for the 2011 -2012 and
2012 -2013 fiscal year.
Implementati on shall consist of at least the following actions:
Implement a school education program to promote water conservation and water
conservation related benefits.
Programs include working with school districts and private schools in the City’s
service area t o provide instructional assistance, educational materials, and
classroom presentations that identify urban, agricultural, and environmental issues
and conditions in the local watershed. Education materials shall meet the state
e ducation framework requirem ents and grade appropriate materials shall be
distributed to grade levels K -3, 4 -6, 7 -8 and high school.
Document number of school presentations made during reporting period.
Document number and type of curriculum materials developed and/or provided by
the City, including confirmation that curriculum materials meet state education
framework requirements and are grade -level appropriate.
Document number of students reached/session.
Document number of in -service presentations or teacher’s workshops conducted
d uring reporting period.
Develop annual budget for school education programs related to conservation.
6.9 C onservation Programs for Commercial, Industrial and
Institutional Accounts
Currently, the City has 4 47 commercial and institutional accounts that represe nt approximately
1 3 % of the City’s total water use . Retrofitting is performed by developers in order to offset water
use anticipated with new commercial or residential construction. This process is applied as a
mitigation measure during the planning proce ss. In June 1997, the City was able to further its
efforts toward implementation of this demand management measure as a result of water
neutralization for a 44 -acre commercial development. The mitigation measure for the project
indicated that the developer should implement a retrofit program to offset 48 AFY of water use.
As part of this effort, the City identified the top 20% of water users in the residential and
commercial sectors. This identification process was facilitated by a computer database
contain ing categorized metered use data. Retrofitting efforts continue as a priority as new
development continues. The capabilities of the water use data will allow the City to update the
list of top water users in conjunction with the retrofit process. Since mos t of the commercial and
institutional water accounts have now been retrofitted, the City allows developers to pay an in
lieu fee to offset water impacts. This fee has provided revenue for the City’s water
neutralization fund. The City will continue to imp lement this demand management measure for
all new developments.
6.10 W holesale Agency Programs
The City is not a wholesaler provider, and hence wholesale agency programs are not
applicable.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -8 11/18/2011
6.11 C onservation Pricing
T he City is implementing a conservation water rat e structure based upon the Water and
Wastewater Financial Plan and Rate Study (16). The intent of the conservation rate structure is
to reduce residential water consumption per account. The tiered (inclining block) structure is
designed to allow single -family and multi -family residential customers to continue to use the
average consumption at nearly the same price but encourage those customers that use water
above the average to conserve water through higher price signals. Table 6 -4 , Table 6 -5 , and
Table 6 -6 include the rate structure and the billing rates for different levels of water use.
Table 6 -4 . Wate r Rates and Service Charges
Inside City Outside City
Meter
Size
FY 09 -
10
FY 10 -
11
FY 11 -
12
FY 12 -
13
FY 13 -
14
FY 09 -
10
FY 10 -
11
FY 11 -
12
FY 12 -
13
FY 13 -
14
Inches $
/month $ /month $ /month $ /month $ /month $ /month $ /month $ /month $ /month $ /month
5/8 $5.35 $5.45 $5.55 $5.65 $5.75 $6.69 $6.81 $6.94 $7.06 $7.19
3/4 $5.35 $5.45 $5.55 $5.65 $5.75 $6.69 $6.81 $6.94 $7.06 $7.19
1 $6.35 $6.50 $6.65 $6.75 $6.90 $7.94 $8.13 $8.31 $8.44 $8.63
1 -1/2 $7.60 $7.80 $8.05 $8.30 $8.55 $9.50 $9.75 $10.06 $10.38 $10.69
2 $11.10 $11.55 $12.00 $12.50 $13.00 $13.88 $14.44 $15.00 $15.63 $16.25
3 $36.95 $38.95 $41.05 $43.30 $45.65 $46.19 $48.69 $51.31 $54.13 $57.06
4 $46.45 $49.05 $51 .80 $54.70 $57.75 $58.06 $61.31 $64.75 $68.38 $72.19
6 $68.80 $72.75 $76.90 $81.30 $85.95 $86.00 $90.94 $96.13 $101.63 $107.44
8 $95.40 $100.55 $106.00 $111.70 $117.75 $119.25 $125.69 $132.50 $139.63 $147.19
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -9 11/18/2011
Table 6 -5 . Volume Charges
Inside City
Outside City
FY 09 -10 FY 10 -11 FY 11 -12 FY 12 -13 FY 13 -14
FY 09 -10 FY 10 -11 FY 11 -12 FY 12 -13 FY 13 -14
Customer Class $ /Ccf $ /Ccf $ /Ccf $ /Ccf $ /Ccf
$ /Ccf $ /Ccf $ /Ccf $ /Ccf $ /Ccf
Single Family First 12 Ccf /
bi -month $1.44 $1.78 $2.21 $2.72 $3.37 $1.80 $2.23 $2.76 $3.40 $4.21
Next 20 Ccf /
bi -month $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.06 $3.78 $4.68
Next 32 Ccf /
bi -month $1.81 $2.24 $2.77 $3.41 $4.23 $2.26 $2.80 $3.46 $4.26 $5.29
Over 64 Ccf /
bi -month $2.19 $2.71 $3.36 $4.14 $5.12 $2.74 $3.39 $4.20 $5.18 $6.40
Multi -Family
First 12 C cf /
bi -month $1.44 $1.78 $2.21 $2.72 $3.37 $1.80 $2.23 $2.76 $3.40 $4.21
Next 6 Ccf / bi -
month $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.06 $3.78 $4.68
Next 12 Ccf /
bi -month $1.81 $2.24 $2.77 $3.41 $4.23 $2.26 $2.8 0 $3.46 $4.26 $5.29
Over 30 Ccf /
bi -month $2.19 $2.71 $3.36 $4.14 $5.12 $2.74 $3.39 $4.20 $5.18 $6.40
Business $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.06 $3.78 $4.68
Church $1.60 $1.98 $2.45 $3.02 $3.7 4 $2.00 $2.48 $3.06 $3.78 $4.68
School $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.06 $3.78 $4.68
Hospital $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.06 $3.78 $4.68
Irrigation $1.76 $2.18 $2.70 $3.32 $4.11 $2.20 $2 .73 $3.38 $4.15 $5.14
Motel $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.06 $3.78 $4.68
Convalescent
Homes $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.06 $3.78 $4.68
Other $1.60 $1.98 $2.45 $3.02 $3.74 $2.00 $2.48 $3.0 6 $3.78 $4.68
Water Wheeling $1.29 $1.29 $1.29 $1.29 $1.29
Hydrant $11.27 $13.52 $16.22 $19.46 $23.35
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -10 11/18/2011
Table 6 -6 . Fire Protection Charges
Hydrant Size FY 09 -10 FY 10 -11 FY 1 1 -12 FY 12 -13 FY 13 -14
Inches $ /month $ /month $ /month $ /month $ /month
1 -½ $2.20 $2.25 $2.30 $2.35 $2.40
2 $2.20 $2.25 $2.30 $2.35 $2.40
3 $6.55 $6.70 $6.85 $7.00 $7.15
4 $13.15 $13.40 $13.65 $13.95 $14.25
6 $36.55 $37 .30 $38.05 $38.80 $39.60
8 $76.75 $78.30 $79.90 $81.50 $83.15
10 $131.55 $134.20 $136.90 $139.70 $142.50
In addition to the tiered water rate structure, the City has been billing sewer charges according
to volume of water used as shown b elow.
Table 6 -7 . Sewer Rates and Service Charges
Customer
Class FY 09 -10
FY 10 -11
FY 11 -12
FY 12 -13
FY 13 -14
Inside
City
Outside
City
Inside
City
Outside
City
Inside
City
Outside
City
Inside
Ci ty
Outside
City
Inside
City
Outside
City
All
Customers $2.20 $2.75 $2.25 $2.81 $2.30 $2.88 $2.35 $2.94 $2.40 $3.00
Volume Charge - $ per hundred
cubic feet
Single Family $0.43 $0.54 $0.47 $0.59 $0.52 $0.65 $0.59 $0.74 $0.67 $0.84
Multi Family $0.58 $0.73 $0.62 $0.78 $0.71 $0.89 $0.82 $1.03 $0.94 $1.18
Business $0.77 $0.96 $0.98 $1.23 $1.08 $1.35 $1.19 $1.49 $1.32 $1.65
Church $0.77 $0.96 $0.98 $1.23 $1.08 $1.35 $1.19 $1.49 $1.32 $1.65
School $0.77 $0.96 $0.98 $1.23 $1.08 $1.35 $1.19 $1.49 $1.32 $1.65
Hospital $0.77 $0.96 $0.98 $1.23 $1.08 $1.35 $1.19 $1.49 $1.32 $1.65
Motel $0.77 $0.96 $0.98 $1.23 $1.08 $1.35 $1.19 $1.49 $1.32 $1.65
Convalescent
Homes $0.77 $0.96 $0.98 $1.23 $1.08 $1.35 $1.19 $1.49 $1.32 $1.65
Other $0.77 $0.96 $0.98 $1.23 $1.08 $1.35 $1.19 $1.49 $1.32 $1.65
City staff will measure the effectiv eness of the water and sewer rate programs by comparing
usage data annually.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -11 11/18/2011
6.12 W ater Conservation Coordinator
The City has implemented this DMM since August 2008. T he City currently employs a part -time
conservation coordinator. The responsibilities of the c onservation coordinator include organizing
public outreach events; informing the public of water news through pamphlets, brochures, bill
inserts, and newspaper articles; keeping the City’s water conservation web page up -to -date;
and implementing the conser vation programs discusses throughout S ection 6.0 . The City plans
to continue implementing this DMM.
6.13 W ater Waste Prohibition
Currently, Title 13 of the City’s Municipal Code makes i t unlawful for any person to willfully or
negligently waste water (please refer to S ection 5.7 ).
6.14 R esidential Ultra -Low Flush Toilet Replacement Programs
The City administers this DMM as part of the residential plumbing retrofit program described in
S ection 6.2 .
6.15 E valuation of Demand Management Measures
Method Used to Evaluate Effectiveness
The City will evaluate the implemented DMM’s or Best Management Practices (BMPs) using the
California Urban Water Conservation Coun cil ’s procedures outlined in their Memorandum of
Understanding .
The City has estimated the savings from the plumbing retrofit program by analyzing the water
usage for an entire year before and post -retro fit. Based on the 200 homes surveyed, the City
esti mates that an average 10,000 gallons are saved each year per customer account. The
Water Code Section 10631
(g) An evaluation of each water demand management measure listed in paragraph (1)
of subdivision (f) that is not currently being implemented or scheduled for
implementation. In the course of the evaluation, first consideration shall be given
to water demand management measures, or combination of measures, that offer
lower incremental costs than expanded or additional water supplies. This
evaluation shall do all of the following:
(1) Take into account economic and noneconomic factors, includin g
environmental, social, health, customer impact, and technological factors.
(2) Include a cost -benefit analysis, identifying total benefits and total costs.
(3) Include a description of funding available to implement any planned water
supply project tha t would provide water at a higher unit cost.
(4) Include a description of the water supplier's legal authority to implement the
measure and efforts to work with other relevant agencies to ensure the
implementation of the measure and to share the cost of implementation.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -12 11/18/2011
overall goal of the city is to reduce the per capita water use to 1 49 gpcd, a 4.5% reduction goal
from 156 gpcd in 20 10 . In addition to the use of methods to evaluate effect iveness discussed
with each DMM described previously, t he City will measure the effectiveness of each
implemented DMM by measuring the overall reduction in per capita water use .
Estimates of Water Savings
T he C ity plans to estimate water savings from th e implemented DMMs in accordance with
accepted practices. Each individual DMM section contains descriptions and estimates of water
savings to the extent practicable.
6.15.1 Demand Management Measures Implementation
The City has implemented or is planning to im plement all applicable demand management
measures as part of the Water Conservation Program. Additional staffing for a Water
Conservation Coordinator may be required to fully implement DMMs as described in the City’s
Water Conservation Program.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -13 11/18/2011
6.16 R ecycl ed Water Plan
6.16.1 Wastewater Collection and Treatment
The South San Luis Obispo County Sanitation District (SSLOCSD) collect s , treat s , and
dispos es of wastewater for the communities of Arroyo Grande, Oceano, and Grover Beach.
The total population served by the SSLOCSD is approximately 3 8 ,424 persons , producing an
average daily flow of 2.9 million gallons of wastewater per day (32). Table 6 -8 summarizes the
volume of wastewater collected in 2005, 2010, and t he amount projected to be collected through
2030. Projected wastewater volumes are based on historical per capita wastewater generation
of 64 gallons per capita per day (33).
Water Code Section 10633
10633. The plan shall provide, to the extent available, information on recycled water
and its potential for use as a water source in the service area of the urban water supplier. The
preparation of the plan sha ll be coordinated with local water,
wastewater, groundwater, and planning agencies that operate within the supplier's
service area, and shall include all of the following:
(a) A description of the wastewater collection and treatment systems in the supplie r's
service area, including a quantification of the amount of wastewater collected and
treated and the methods of wastewater disposal.
(b) A description of the quantity of treated wastewater that meets recycled water
standards, is being discharged, and is otherwise available for use in a recycled
water project.
(c) A description of the recycled water currently being used in the supplier's service
area, including, but not limited to, the type, place, and quantity of use.
(d) A description and quantificati on of the potential uses of recycled water,
including, but not limited to, agricultural irrigation, landscape irrigation, wildlife
habitat enhancement, wetlands, industrial reuse, groundwater recharge, indirect
potable reuse, and other appropriate uses, an d a determination with regard to the
technical and economic feasibility of serving those uses.
(e) The projected use of recycled water within the supplier's service area at the end
of 5, 10, 15, and 20 years, and a description of the actual use of recycle d water in
comparison to uses previously projected pursuant to this subdivision.
(f) A description of actions, including financial incentives, which may be taken to
encourage the use of recycled water, and the projected results of these actions in
terms o f acre -feet of recycled water used per year.
(g) A plan for optimizing the use of recycled water in the supplier's service area,
including actions to facilitate the installation of dual distribution systems, to
promote recirculating uses, to facilitate th e increased use of treated wastewater
that meets recycled water standards, and to overcome any obstacles to achieving
that increased use.
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -14 11/18/2011
Table 6 -8 . Wastewater collected and treated in the service area (AFY)
Type of Wastewater 2005 2010 2015 2020 2025 2030
Wastewater collected &
treated in service area 1,197 1,213 1,255 1,295 1,338 1,376
Volume that meets recycled
water standard 1 1,197 1,2 13 1,255 1,295 1,338 1,376
1 SSLOCSD currently produces secondary recycled water that is defined by Title 22 as “Disinfected
Secondary -23 Recycled Water.” However, all effluent is discharged to the Pacific Ocean.
As of 2008, SSLOCSD received on average 2.88 mgd, and a little less than half of the total
flows were from the City. Wastewater influent is first passed through an in -channel screen to
remove large debris. After debris removal, wastewater flows through two clarifiers and then into
a single fixe d film reactor for secondary treatment. Wastewater effluent from the fixed film
reactor then flows to secondary clarification to remove any sloughed off bacterial film. Finally,
the treated wastewater is disinfected with sodium hypochlorite before being di scharged to the
Ocean. Table 6 -9 quantifies all treated wastewater that is discharged to the ocean.
Table 6 -9 . Wastewater disposal methods and treatment level (AFY)
Method of Dispo sal Treatment Level 2010 2015 2020 2025 2030
Ocean Outfall Secondary 1,213 1,255 1,295 1,338 1,376
6.16.2 Potential Recycled Water Demands
The City is currently considering a recycled water program and plans to pursue recycled water
in the future. The followin g recycled water studies have been completed with the goal of
identifying potential recycled water projects, which would benefit the City:
- Water Recycling Progress Report , Prepared for South San Luis Obispo County
Sanitation District, Prepared by John L. Wallace & Associates, February 20 0 1
- Recycled Water Distribution System Conceptual Plan - South San Luis Obispo County
Sanitation District WWTP Technical Memorandum , Prepared by the Wallace Group,
June 2010
- Recycled Water Distribution System Conceptual Plan - City of Pismo Beach WWTP
Technical Memorandum , Prepared by the Wallace Group, June 2010
- Water Recycling Update report , Prepared for South San Luis Obispo Sanitation District,
Prepared by the Wallace Group, January 2009
South San Luis Obispo County Sanitat ion District (SSLOCSD) Opportunities
The June 2010 SSLOCSD WWTP Technical Memorandum listed previously identif ied and
evaluate d recycled water opportunities for the City. One near -term opportunity outlined in the
report was to use Disinfected Secondary -23 Recycled Water (Secondary -23) effluent to irrigate
the Arroyo Grande Cemetery and Caltrans median along Highway 101. The amount of water
that could be saved annually from using Secondary -23 effluent on the Cemetery and Caltrans
2010 Urban Water Management Plan Final Draft
6.0 Water Co nservation
City of Arroyo Grande 6 -15 11/18/2011
median is 41.9 AFY and 15.7 AF Y respectively. However, while Caltrans prefers to use non -
potable water for landscaping, current policy allows only tertiary treated water for irrigation.
Future negotiations will commence to determine if Caltrans can accept SSLOCSD Secondary -
23 water.
Also discussed in the study was the potential for future recycled water use if the SSLOCSD
WWTP were upgraded to provide tertiary treatment . By providing tertiary treatment , recycled
water use would no longer be limited to cemeteries, restricted access g olf courses, freeway
landscaping and other uses with limited human interaction . Tertiary treated recycled water that
complies with Title 22 requirements could be applied to public parks, playgrounds, schoolyards,
direct use on food crops, and other uses. T he potential demand for tertiary treated recycled
water within the City’s water service area is 189.7 AFY . The potential sites would include parks,
schools , a sports complex, and a K -Mart Center (8).
The City could collaborate with the SSLOCSD and other interested NCMA agencies to use
secondary effluent for median and cemetery irrigation as described above, and/or participate in
a broader recycled water program if SSLOCSD were to upgrade to tertiary treatment. If
SSLOCSD were t o upgrade its facility to provide tertiary treatment, t he timing and extent of th e
treatment requirement s should be considered concurrently with the development of a recycled
water program .
City of Pismo Beach Wastewater Treatment Plant Opportunities
Th e City of Pismo Beach UWMP states that the City of Pismo Beach is “committed to employ
recycled water as a beneficial resource to protect and reduce consumption of its potable water
resources” and that “the City may begin regional planning efforts regardin g recycled water within
the next five years” (34). The City of Pismo Beach plans to upgrade its WWTP to provide an
anticipated recycled water supply of 1,558 AFY in 2015 (34). This supply is an es timate and has
not been finalized, but provides an idea of the amount of recycled water that could be available.
The City of Pismo Beach UWMP describes that the recycled water not used for irrigation near
the WWTP and in the Price Canyon development area “may be applied towards groundwater
recharge operations” (34). The Pismo Beach WWTP outfall pipeline passes relatively close by
the City. If the City of Pismo Beach were to produce excess recycled water, the City could utilize
the recycled water for irrigation demand, and/or work with interested NCMA agencies to apply
the recycled water for groundwater recharge within the NCMA .
Summary of Potential and Projected Recycled Water Uses and Quantities
Table 6 -10 provides a summary of potential recycled water including the estimated tertiary
demand discussed in the SSLOCSD Opportunities section as well as an estimated potential
from the City of Pismo Beach . Potential recycled water f r om SSLOCSD is assumed to equal a
maximum amount of recycled water use based on average annual demands from 2007 -2009 for
potable water from customer use types that can accept recycled water. P otential sources of
recycled water from the City of Pismo Beach are assumed to equal the amount of recycled
water identified in the Groundwater Recharge line item of Table 4.12 of the City of Pismo Beach
2010 UWMP .
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -16 11/18/2011
Table 6 -10 . Potential Uses and Quantities of Recycled Water (AFY)
User Type T reatment
Level 2010 2015 2020 2025 2030
Agriculture N/A 0 0 0 0 0
Landscape 1 Tertiary 0 189.7 189.7 189.7 189.7
Wildlife
Habitat
N/A 0 0 0 0 0
Wetlands N/A 0 0 0 0 0
Industrial N/A 0 0 0 0 0
Groundwater
Recharge 2
N/A 0 764 901 987 1,129
Other N/A 0 0 0 0 0
1 Assumes a maximum amount of recycled water from SSLOCSD based on average annual demands
from 2007 -2009 for potable water from customer use types that can accept recycled water. 2 Assumes the entire amount of the Groundwater Recharge line item of Table 4.12 of the City of Pismo
Beach 2010 UWMP could be potential ly used by the City.
The City ’s 2005 UWMP did not project any recycled water use for 2010, as shown in Table
6 -11 . The actual recycled water use in 2010 was al so zero for all use types.
Table 6 -11 . 2005 UWMP projections of recycled water use in 2010 and actual recycled water use
in 2010 (AFY)
User Type 200 5 projection for 20 10 20 10 actual use
Agriculture 0 0
Lan dscape 0 0
Wildlife Habitat 0 0
Wetlands 0 0
Industrial 0 0
Groundwater Recharge 0 0
Other 0 0
Although there are opportunities for recycled water use in the future, a specific recycled water
project has not been selected or analyzed in enough detai l to provide a quantifiable projected
supply estimate at the time of the preparation of this UWMP. Table 6 -12 shows the City’s
projected recycled water use through 2030.
Table 6 -12 . Projected Recycled Water Use
2015 2020 2025 2030
Recycled Water Use 0 0 0 0
2010 Urban Water Management Plan Final Draft
6.0 Water Conservation
City of Arroyo Grande 6 -17 11/18/2011
Participation in a Regional Recycled Water Program
T he City is committed to participating in a regional effort to utilize recycled water, and will
continue to p articipat e in a dialogue between regional agencies interested in a recycled water
program (including but not necessarily limited to the NCMA agencies). Ultimately, the City
envisions working with those agencies to conceptualize , prioritize , fund and implement a
preferre d set of regional recycled water project s that benefit the City, as well as the NCMA as a
whole.
6.17 Storm Water Reclamation
Since 1990, the City has operated the Soto Sports Complex Storm Water Reclamation Project.
This project includes a forty -acre joint use facility, which serves as a collection point for drainage
from a third of the City’s area. Storm water is collected for the subsequent irrigation of a park
and seven athletic fields. The estimated offset of potable water demand is approximately 100
AFY . The system includes drainage water sumps, an irrigation well, two booster pump stations,
an irrigation system, and a construction water fill station.
There is an existing detention basin on the Wal -M art site near the intersection of West Branch
Street a nd Camino Mercado . It is estimated that the basin has an approximate size of 6.4 acre
feet (9). The potential estimated irrigation demand for the Wal -M art site is 42.7 AFY. This
potential project has not been fully developed and would require a detailed hydrologic study.
2010 Urban Water Management Plan Final Draft
7.0 Water Quality Impacts and Water Service Reliability
City of Arroyo Grande 7 -1 11/18/2011
7.0 W ater Quality Impacts and Water Service Reliability
7.1 W ater Quality Impact on Water Reliability
At the present time, one well exceed s the maximum contaminant level for manganese. This well
is treated prior to distribution. Given the City’s use of both surface and groundwater, and the
capability of the water treatment system, the City anticipates meeting SDWA requirements in
the future and that supplies will remain unaffected by water quality impacts.
7.2 W ater Service Reliability
The UWMP Act requires that every urban supplier include an assessment of the reliability of its
future water service to its customers during normal, dry, and multiple -dry water years. This
assessment compares the impact of varied dry y ear conditions on total water supply sources
available to the City with the total projected water supply over the next twenty years in five -year
increments. Projections include data from Table 3 -2 , Table 3 -3 , Table 3 -5 , Table 3 -7 , Section
4.0 , and Table 5 -5 through Table 5 -7 , including historical dry -year rainfall and water d emand.
Water Code Sections 10634 & 10635
10634. The plan shall include information, to the extent practicable, relating to t he
quality of existing sources of water available to the supplier over the same five -year
increments as described in subdivision (a) of Section 10631, and the manner in which
water quality affects water management strategies and supply reliability.
10635.
(a) Every urban water supplier shall include, as part of its urban water management
plan, an assessment of the reliability of its water service to its customers during
normal, dry, and multiple dry water years. This water supply and demand assessment
shal l compare the total water supply sources available to the water
supplier with the total projected water use over the next 20 years, in five -year
increments, for a normal water year, a single dry water year, and multiple dry
water years. The water service r eliability assessment shall be based upon the
information compiled pursuant to Section 10631, including available data from
state, regional, or local agency population projections within the service area of
the urban water supplier.
(b) The urban water su pplier shall provide that portion of its urban water
management plan prepared pursuant to this article to any city or county within
which it provides water supplies no later than 60 days after the submission of its
urban water management plan.
(c) Nothing in this article is intended to create a right or entitlement to water service
or any specific level of water service.
(d) Nothing in this article is intended to change existing law concerning an urban
water supplier's obligation to provide water service to its existing customers or to
any potential future customers.
2010 Urban Water Management Plan Final Draft
7.0 Water Quality Impacts and Water Service Reliability
City of Arroyo Grande 7 -2 11/18/2011
A comparison of projected normal water year demands compared to normal water year supply
is shown on Table 7 -1 .
Table 7 -1 . Supply and Demand - Normal Year (AFY)
2015 2020 2025 2030
Supply Totals 3,913 3,813 3,813 3,813
Demand Totals 3,288 2,987 3,089 3,176
Difference 625 826 724 637
Difference as % of
Supply 16% 22% 19% 17%
Difference as % of
Demand 19% 28% 23% 20%
For projected single -dry year supply and demand comp arisons, no significant change is
anticipated as shown in Table 7 -2 . This data assumes demand reductions based on SB7
requirements .
Table 7 -2 . Supply and Demand - Single Dry Year (AFY )
2015 2020 2025 2030
Supply Totals 3,913 3,813 3,813 3,813
Demand Totals 3,288 2,987 3,089 3,176
Difference 625 826 724 637
Difference as % of
Supply 16% 22% 19% 17%
Difference as % of
Demand 19% 28% 23% 20%
Multiple -dry year projections are sho wn in Table 7 -3 . This data assumes demand reductions
based on SB7 requirements .
2010 Urban Water Management Plan Final Draft
7.0 Water Quality Impacts and Water Service Reliability
City of Arroyo Grande 7 -3 11/18/2011
Table 7 -3 . Supply and Demand - Multiple Dry Years (AFY)
2015 2020 2025 2030
Multiple -dry year
first year supply
Supply totals 3,913 3,813 3,813 3,813
Demand
totals 3,288 2,987 3,089 3,176
Difference 625 826 724 637
Difference as
% of Supply 16% 22% 19% 17%
Difference as
% of Demand 19% 28% 23% 20%
Multiple -dry year
second year
supply
Supply totals 3,913 3,813 3,813 3,813
Demand
totals 3,288 2,987 3,089 3,176
Difference 625 826 724 637
Difference as
% of Supply 16% 22% 19% 17%
Difference as
% of Demand 19% 28% 23% 20%
Multiple -dry year
third year supply
Supply totals 3,913 3,813 3,813 3,813
Demand
totals 3,288 2,987 3,089 3,176
Difference 625 826 724 637
Difference as
% of Supply 16% 22% 19% 17%
Difference as
% of Demand 19% 28% 23% 20%
2010 Urban Water Management Plan Final Draft
8.0 Adoption and Imple mentation
City of Arroyo Grande 8 -1 11/18/2011
8.0 A doption and Implementation
Water Code Section 10640 -10645
10640. Every urban water supplier required to prepare a plan pursuant to this part
shall prepare its plan pursuant to Article 2 (commencing with Section 10630).
The supplier shall likewise periodically review the plan as required by Section 10621,
and any amendments or changes required as a result of that review shall be adopted
pursuant to this article.
10641. An urban water supplier required to prepare a plan may consult with, and obtain comments from, any public agency or state agency or any person who has
special expertise with respect to water demand management methods and techniques.
10642. Each urban water supplier shall encourage the active involvement o f diverse
social, cultural, and economic elements of the population within the service area prior to and during the preparation of the plan. Prior to adopting a plan, the urban water
supplier shall make the plan available for public inspection and shall ho ld a public
hearing thereon. Prior to the hearing, notice of the time and place of hearing shall be
published within the jurisdiction of the publicly owned water supplier pursuant to
Section 6066 of the Government Code. The urban water supplier shall provi de notice
of the time and place of hearing to any city or county within which the supplier
provides water supplies. A privately owned water supplier shall provide an
equivalent notice within its service area. After the hearing, the plan shall be adopted
as prepared or as modified after the hearing.
10643. An urban water supplier shall implement its plan adopted pursuant to this
chapter in accordance with the schedule set forth in its plan.
10644.
(a) An urban water supplier shall submit to the department, the California State Library, and any city or county within which the supplier provides water supplies
a copy of its plan no later than 30 days after adoption. Copies of amendments or
changes to the plans shall be submitted to the department, the Californ ia State
Library, and any city or county within which the supplier provides water supplies
within 30 days after adoption.
(b) The department shall prepare and submit to the Legislature, on or before
December 31, in the years ending in six and one, a repor t summarizing the status
of the plans adopted pursuant to this part. The report prepared by the department
shall identify the exemplary elements of the individual plans. The department shall provide a copy of the report to each urban water supplier that ha s submitted
its plan to the department. The department shall also prepare reports and provide
data for any legislative hearings designed to consider the effectiveness of plans
submitted pursuant to this part.
(c)
(1) For the purpose of identifying the ex emplary elements of the individual
plans, the department shall identify in the report those water demand
management measures adopted and implemented by specific urban water
suppliers, and identified pursuant to Section 10631, that achieve water savings sig nificantly above the levels established by the department to meet
the requirements of Section 10631.5.
(2) The department shall distribute to the panel convened pursuant to
Section 10631.7 the results achieved by the implementation of those water
demand m anagement measures described in paragraph (1).
(3) The department shall make available to the public the standard the
department will use to identify exemplary water demand management
measures.
10645. Not later than 30 days after filing a copy of its pla n with the department, the
urban water supplier and the department shall make the plan available for public
review during normal business hours.
2010 Urban Water Management Plan Final Draft
8.0 Adoption and Implementation
City of Arroyo Grande 8 -2 11/18/2011
8.1 P ublic Meeting Notice
Insert Public Meeting Notice Here
8.2 A doption Resolution
Insert Adoption Resolution Here
2010 Urban Water Management Plan Final Draft
9.0 References
City of Arroyo Grande 9 -1 11/18/2011
9.0 R eferences
1. City of Arroyo Grande Public Works D epartment. City of Arroyo Grande Water Supply
Alternatives Study. August 24, 2004.
2. Water Systems Consulting, Inc. CAPACITY EVALUATION OF THE LOPEZ PIPELINE
FOR DELIVERY OF ADDITIONAL STATE WATER PROJECT SUPPLIES TO THE
NORTHERN CITIES TECHNICAL MEMORAND UM. September 9, 2010.
3. City of Arroyo Grande Community Development Department. City of Arroyo Grande
Housing Element. November 25, 2003.
4. City of Arroyo Grande. Fringe and Urban Area Land Use Element. 2001.
5. City of Arroyo Grande in Association with Water Systems Consulting, Inc. Water
System Master Plan. 2011.
6. California Department of Water Resources. Guidebook to Assist Urban Water Suppliers to
Prepare a 2010 Urban Water Management Plan. March 2011.
7. —. Methodologies for Calculating Baseline a nd Compliance Urban Per Capita Water Use.
February 2011.
8. Steve Tanaka, PE & Valerie Huff, PE. Recycled Water Distribution System Conceptual
Plan - South San Luis Obispo County Sanitation District WWTP. s.l. : Wallace Group, April 2010.
9. City of Arroyo Grande. Recycled Water Distribution System Conceptual Plan Technical
Memorandum. April 2010.
10. San Luis Obispo Council of Governments. Regional Housing Needs Plan. August 2008.
11. Prepared for San Luis Obispo Council of Governments by AECOM Technical
Se rvices. San Luis Obispo County 2040 Population, Housing & Employment Forecast. June 24,
2011.
12. Wallace Group. Zone 3 Urban Water Management Plan 2010 Update. s.l. : San Luis
Obispo County Flood Control and Water Conservation District, June 2011.
13. Car ollo Engineers. Draft San Luis Obispo County Flood Control and Water Conservation
District San Luis Obispo County Master Water Plan. 2011.
14. District, San Luis Obispo County Flood Control and Water Conservation. San Luis
Region Integrated Regional Water Management Plan. July 2007.
15. Wallace Group. Supplemental Water Supply Study Nacimiento Pipeline Extension City of
Arroyo Grande, City of Grover Beach, Oceano Community Services District. January 2006.
16. Tuckfield & Associates. Water and Wastewater Fin ancial Plan and Rate Study. March
2009.
17. Todd Engineers. Water Balance Study for the Northern Cities Area. April 2007.
18. Wallace Group. Water Recycling Update Report Prepared for the South San Luis Obispo
County Sanitation District. January 2009.
19. —. Water Supply Study: Desalination Oceano Community Services District, City of Arroyo
Grande, City of Grover Beach. January 2006.
20. California Irrigation Management Information System. Monthly Average ETo Report.
[Online] July 14, 2011. http://www.cimis .water.ca.gov/cimis/monthlyEToReport.do.
21. Water Systems Consulting, Inc. Agricultural Conversion Credits for Two Parcels Located
in Arroyo Grande Technical Memorandum. March 5, 2010.
22. Cleath & Associates. Ground Water Source Assessment Los Robles Del Mar Project
Pismo Beach. August 2003.
23. URS. Preliminary Program -Level Budget and Schedule for Lopez Reservoir Expansion
Memorandum. November 11, 2008.
24. Wallace Group. Urban Water Management Plan 2010 Update. s.l. : San Luis Obispo
County Flood Contr ol and Water Conservation District, June 2011.
City of Arroyo Grande 9 -2 11/18/2011
25. Todd Engineers. 2009 Annual Monitoring Report, Northern Cities Management Area. April
2010.
26. GEI Consultants, Inc. 2010 Annual Monitoring Report for the Northern Cities Management
Area. April 2011.
27. City of Arroyo Grande. NOAA Pismo Beach Station & Arroyo Grande Corp Yard Gauge
#177.1. 1949 -1986, 1987 -2010.
28. —. Emergency Response Plan.
29. A & N Technical Services, Inc. Draft Revision BMP Cost & Savings Study. March 2005.
30. California Urban Wate r Conservation Council. Resource Center. California Urban Water
Conservation Council. [Online] 2011. [Cited: September 28, 2011.] http://cuwcc.org/smart -
rebate -commercial -high -efficiency -toilet.aspx.
31. Energy Star. Clothes Washer Calculator.xls. [Online]
http://webcache.googleusercontent.com/search?q=cache:SIz_LrWpp1EJ:www.energystar.gov/i
a/business/bulk_purchasing/bpsavings_calc/CalculatorConsumerClothesWasher.xls+departme
nt+of+energy+washing+machine+2009+annual+water+consumption&cd=2&hl=en&ct=clnk&gl=
us .
32. South San Luis Obispo County Sanitation District. sslocsd.org. South San Luis Obispo
County Sanitation District. [Online] October 27, 2008.
http://sslocsd.org/index.php?option=com_content&view=article&id=30&Itemid=130.
33. City of Arroyo Grande. Wast ewater System Master Plan. November 13, 2001.
34. Carollo Engineers, Inc. City of Pismo Beach 2010 Urban Water Management Plan.
September 2011.
35. Economics Research Associates, an AECOM company (ERA). Project Report Update to
Long Range Socio -Economic Pr ojections. August 2, 2010.
36. Unites States Census Bureau. DP -1 Arroyo Grande City 2010 Demographic Profile. 2011.
37. Watts Water Technologies. www.watts.com. Water Safety & Flow Control/ Support.
[Online] 2011. [Cited: August 9, 2011.] http://www.watts.com/pages/faq.asp?catId=64&faqId=7.
38. Kesler, Craig. Chief Operator of the Lopez Water Treatement Plant. Email
Correspondence. July 29, 2011.
A
A ppendix A . Judgment
A. Judgment , Santa Maria Valley Water Conservation District v. City of Santa Maria et al.,
May 15, 2004
JAN 2 5 2008
SUPERIOR COURT OF CALIFORNIA
COUNTY OF SANTA CLARA
SANTA MARIA VALLEY WATER
CONSERVATION DISTRICT,
Plaintiff,
SANTA MARIA GROUNDWATER
LITIGATION
Lead Case No. 1-97-CV-770214
(CONSOLIDATED FOR ALL
PURPOSES)
VS. [Consolidated With Case Numbers:
CITY OF SANTA MARIA, ET AL.. CV 784900; CV 785509; CV 785522;
CV 787150; CV 784921; CV 78551 1;
CV 785936; CV 787151; CV 784926;
Defendants. CV 785515; CV 786791; CV 787152;
1-05-CV-0364101
I I 1 San Luis Obispo County Superior I
AND RELATED CROSS-ACTIONS AND
ACTIONS CONSOLIDATED FOR ALL
PURPOSES
Court Case Nds. 990738 and 990739
JUDGMENT AFTER TRIAL
This matter came on for trial in five separate phases. Following the third phase of trial,
a large number of parties entered into a written stipulation dated June 30, 2005 to resolve their 1 differences and requested that the cow approve the settlement and make its terms binding on 1
them as a part of any final judgment entered in this case. Subsequent to the execution of the
stipulation by the original settling parties, a number of additional parties have agreed to be
I I bound by the stipulation - their signatures are included in the attachments to this judgment. I
Case No. 1-97-CV-770214
Judgment After Trial
The June 30, 2005 Stipulation is attached as Exhibit "1;" and all exhibits to the
,tipulation are separately attached as Exhibits "1A" through "1H". The Stipulating Parties are
ientified on Exhibit "IA." The court approves the Stipulation, orders the Stipulating Parties
nly to comply with each and every term thereof, and incorporates the same herein as though
et forth in full. No non-stipulating party is bound in any way by the stipulation except as the
ourt may otherwise independently adopt as its independent judgment a term or terms that are
le same or similar to such term or provision of the stipulation.
As to all remaining parties, including those who failed to answer or otherwise appear,
le court heard the testimony of witnesses, considered the evidence found to be admissible by
le court, and heard the arguments of counsel. Good cause appearing, the court finds and
rders judgment as follows.
As used in this Judgment, the following terms shall have the meanings herein set forth:
- The groundwater basin described in the Phase I and I1 orders of the court, as
lodified, with attachments and presented in Exhibit "1B".
Defaultinn Parties - All persons or entities listed on Exhibit "3".
Imuorted Water - Water within the Basin received from the State Water Project,
riginating outside the Basin, that absent human intervention would not recharge or be used in
le Basin.
LOG Parties - All persons or entities listed on Exhibit "2:" listed under the subheading
LOG Parties".
Non-Stipulatin~ Parties - All Parties who did not sign the Stipulation, including the
)efaulting Parties and the LOG and Wineman Parties.
Pavties - All parties to the above-referenced action, including Stipulating Parties, Non-
tipulating Parties, and Defaulting Parties.
Public Water Producers - City of Santa Maria, Golden State Water Company, Rural
Vater Company, the "Northern Cities" (collectively the Cities of Arroyo Grande, Pismo
teach, and Grover Beach, and Oceano Community Services District), and the Nipomo
'ommunity Services District.
ase No. 1-97-CV-770214
~dgment After Trial
Return Flows - All water which recharges the Basin after in~tial use, through the use of
percolation ponds and others means, derived from the use and recharge of imported water
delivered through State Water Project facilities.
Stipulating Parties - All Parties who are signatories to the Stipulation.
Stipulation - The Stipulation dated June 30, 2005 and incorporated herein as Exhibit
"1," with each of its Exhibits separately identified and incorporated herein as Exhibits "1A"
through " 1 H".
Storage Space - The portion of the Basin capable of holding water for subsequent
reasonable and beneficial uses.
W~nernan Parties - All persons or entities listed on Exhibit "2," under the subheading
"Wineman Parties".
The following Exhibits are attached to this Judgment:
1. Exhibit "I, "June 30, 2005 Stipulation and the following exhibits thereto:
a. Exhibit "IA, " list identifying the Stipulating Parties and the parcels of
land bound by the Stipulation.
b. Exhibit "IB, " Phase I and I1 Orders, as modified, with attachments.
c. Exhibit "IC," map of the Basin and boundaries of the three
Management Areas.
d. Exhibit "ID," map identifying those lands as of January I, 2005: 1)
within the boundaries of a municipality or its sphere of influence, or within the process of
inclusion in its sphere of influence; or 2) within the certificated service area of a publicly
regulated utility; and a list of selected parcels that are nearby these boundaries which are
excluded from within these areas.
e. Exhibit "IE, " 2002 Settlement Agreement between the Northern Cities
and Northern Landowners.
f. Exhibit "IF," the agreement among Santa Maria, Golden State and
Guadalupe regarding Twitchell Project and the Twitchell Management Authority.
g. Exhibit "lG," the court's Order Concerning Electronic Service of
Case No. 1-9743-7702 14
Judgment After Trial
'leadings and Electronic Posting of Discovery Documents dated June 27,2000.
h. Exhibit "lH, " the form of memorandum of agreement to be recorded.
2. Exhibit "2, " List of Non-Stipulating LOG and Wineman Parties and recorded
eed numbers of property they owned at the time of trial.
3. Exhibit "3, " List of Defaulting parties.
A declaratory judgment and physical solution are hereby adjudged and decreed
s follows:
1. As of the time of trial, LOG and Wineman Parties owned the real property,
sted by assessor's parcel numbers, as presented in Exhibit 2.
2. The City of Santa Maria and Golden State Water Company are awarded
rescriptive rights to ground water against the non-stipulating parties, which rights shall be
leasured and enforced as described below.
3. The City of Santa Maria and Golden State Water Company have a right to use
le Basin for temporary storage and subsequent recapture of the Return Flows generated from
leir importation of State Water Project water, to the extent that such water adds to the supply
f water in the aquifer and if there is storage space in the aquifer for such return flows,
lcluding all other native sources of water in the aquifer. The City of Santa Maria's Return
lows represent 65 percent of the amount of imported water used by the City. Golden State
Vater Company's Return Flows represent 45 percent of the amount of imported water used by
iolden State in the basin.
4. (a) The Northern Cities have a prior and paramount right to produce 7,300 acre-
:et of water per year from the Northern Cities Area of the Basin; and (b) the Non-Stipulating
arties have no overlying, appropriative, or other right to produce any water supplies in the
Iorthern Cities Area of the Basin.
5. The Groundwater Monitoring Provisions and Management Area Monitoring
rograms contained in the Stipulation, including Sections IV(D) (All Management Areas);
'(B) (Santa Maria Management Area), VI(C) (Nipomo Mesa Management Area), and VII (1)
Vorthern Cities Management Area), inclusive, are independently adopted by the court as
ase No. I -97-CV-7702 14
~dgment After Trial
necessary to manage water production in the basin and are incorporated herein and made terms
of this Judgment. The Non-Stipulating Parties shall participate in, and be bound by. the
applicable Management Area Monitoring Program. Each Non-Stipulating Party also shall
monitor their water production, maintain records thereof, and make the data available to the
court or its designee as may be required by subsequent order of the court.
6. No Party established a pre-Stipulation priority right to any portion of that
increment of augmented groundwater supply within the Basin that derives from the Twitchell
Project's operation.
7. The court determines that there is a reasonable likelihood that drought and
overdraft conditions will occur in the Basin in the foreseeable future that will require the
exercise of the court's equity powers. The court therefore retains jurisdiction to make orders
enforcing the rights of the parties hereto in accordance with the terms of this judgment.
a. Groundwater
I. The overlying rights of the LOG and Wineman Parties shall be
adjusted by amounts lost to the City of Santa Maria and Golden State Water Company by
prescription. The prescriptive rights of the City of Santa Maria and Golden State Water
Company must be measured against the rights of all overlying water producers pumping in the
acquifer as a whole and not just against the LOG and Wineman Parties because adverse
pumping by the said water producers was from the aquifer as a whole and not just against the
non-stipulating parties. The City of Santa Maria established total adverse appropriation of
5100 acre feet per year and Golden State Water Company established adverse appropriation of
1900 acre feet a year, measured against all usufructuary rights within the Santa Maria Basin.
The City of Santa Maria and Goldcn State Water Company having waived the right to seek
prescription against the other stipulating parties, may only assert such rights against the non
stipulating parties in a proportionate quantity. To demonstrate the limited right acquired by
the City of Santa Maria and Golden State Water Company, by way of example, if the
cumulative usufructuary rights of the LOG and Wineman Parties were 1,000 acre-feet and the
cumulative usufructuary rights of all other overlying groundwater right holders within the
5
Case No. 1-97-CV-770214
Judgment After Trial
Basin were 100,000 acre-feet, the City of Santa Maria and Golden State Water Company
would each be entitled to enforce 1% of their total prescriptive right against the LOG and
Wineman Parties. That is, Golden State Water Company could assert a prescriptive right of
19 annual acre-feet, and the City of Santa Maria 51 annual acre-feet, cumulatively against the
LOG and Wineman Parties, each on a proportionate basis as to each LOG and Wineman
Party's individual use.
ii. The Defaulting Parties failed to appear at trial and prove any
usuhctuary water rights. The rights of the Defaulting Parties, if any, are subject to the
prescriptive rights of the City of Santa Maria and Golden State Water Company, as well as the
other rights of said parties as established herein.
b. Imported Water
The City of Santa Maria and Golden State Water Company shall have rights to Return
Flows in the amount provided above.
c. Northern Cities
The rights of all Parties in the Northern Cities Management Area shall be governed as
described above on page 4, lines 21 to 24.
8. The LOG and Wineman Parties have failed to sustain the burden of proof in
their action to quiet title to the quantity of their ground water rights as overlying owners. All
other LOG and Wineman party causes of action having been dismissed, judgment is hereby
entered in favor of the Public Water Producers as to the quiet title causes of action brought by
the LOG and the Wineman Parties. Legal title to said real property is vested in the Log and
Wineman Parties and was not in dispute in this action.
9. Each and every Party, their officers, agents, employees, successors and assigns,
are enjoined and restrained from exercising the rights and obligations provided through this
Judgment in a manner inconsistent with the express provisions of this Judgment.
10. Except upon further order of the court. each and every Party and its officers,
agents, employees, successors and assigns, is enjoined and restrained from transporting
groundwater to areas outside the Basin, except for those uses in existence as of the date of this
6
Case No. 1-97-CV-7702 14
Judgment After Trial
Judgment; provided, however. that groundwater may be delivered for use outside the Basin as
long as the wastewater generated by that use of water is discharged within the Basin, or
agricultural return flows resulting from that use return to the Basin.
11. Jurisdiction, power and authority over the Stipulating Parties as between one
another are governed exclusively by the Stipulation. The court retains and reserves
jurisdiction as set forth in this Paragraph over all parties hereto. The court shall make such
further or supplemental orders as may be necessary or appropriate regarding interpretation and
enforcement of all aspects of this Judgment, as well as clarifications or amendments to the
Judgment consistent with the law.
12. Any party that seeks the court's exercise of reserved jurisdiction shall file a
noticed motion with the court. Any noticed motion shall be made pursuant to the court's
Order Concerning Electronic Service of Pleadings and Electronic Posting of Discovery
Documents dated June 27,2000.
13. The court shall exercise de novo review in all proceedings. The actions or
decisions of any Party, the Monitoring Parties, the TMA, or the Management Area Engineer
shall have no heightened evidentiary weight in any proceedings before the court.
14. As long as the court's electronic filing system remains available, all court
filings shall be made pursuant to court's Order Concerning Electronic Service of Pleadings
and Electronic Posting of Discovery Documents dated June 27, 2000, or any subsequent
superseding order. If the court's electronic filing system is eliminated and not replaced, the
Parties shall promptly establish a substitute electronic filing system and abide by the same
rules as contained in the court's Order.
15. Nothing in this Judgment shall be interpreted as relieving any Party of its
responsibilities to comply with state or federal laws for the protection of water quality or the
provisions of any permits, standards, requirements, or order promulgated thereunder.
16. Each Party shall designate the name, address and e-mail address, if any, to be
used for purposes of all subsequent notices and service by a designation to be filed within
thirty days after entry of this Judgment. This designation may be changed from time to time
7
Case No. 1-97-CV-770214
Judgment After Trial
)y filing a written notice with the court. Any Party desiring to be relieved of receiving notices
nay file a waiver of notice on a form approved by the court. The court shall maintain at all
imes a current list of Parties to whom notices are to be sent and their addresses for purposes
)f service. The court shall also maintain a full current list of names, addresses, and e-mail
rddresses of all Parties or their successors, as filed herein. Copies of such lists shall be
wailable to any Person. If no designation is made, a Party's designee shall be deemed to be, in
rder of priority: i) the Party's attorney of record; ii) if the Party does not have an attorney of
ecord, the Party itself at the address specified.
17. All real property owned by the Parties within the Basin is subject to this
ludgment. The Judgment will be binding upon and inure to the benefit of each Party and their
espective heirs, executors, administrators, trustees, successors, assigns, and agents. Any
)arty, or executor of a deceased party, who transfers property that is subject to this judgment
;hall notify any transferee thereof of this judgment and shall ensure that the judgment is
ecorded in the line of title of said property. This Judgment shall not bind the Parties that
:ease to own property within the Basin, and cease to use groundwater. Within sixty days
ollowing entry of this Judgment, the City of Santa Maria, in cooperation with the San Luis
Ibispo entities and Golden State, shall record in the Office of the County Reporter in Santa
3arbara and San Luis Obispo Counties, a notice of entry of Judgment.
The Clerk shall enter this Judgment.
SO ORDERED, ADJUDGED, AND DECREED.
>ate& January 25,2008
Juqge $the Superior Court
:ase No. 1-97-CV-770214
udgment After Trial
B
A ppendix B . Management Agreement
B. Management Agreement, City of Arroyo Grande, Pismo Beach, Grover Beac h, 2002
C
A ppendix C . Water Conservation Program
C. City of Arroyo Grande, Municipal Code Chapter 13.05, Water Conservation Program,
Adopted May 13, 2003, Amended 2005
D
A ppendix D . Agency Notification and Coordination
E
Appendix E . Per Capita Water Use Memo
City of Arroyo Grande 2010 Urban Water Management Plan Update
Baseline Daily Per capita Water Use and Target Water Use - Draft
Date: 9/30/2011
To: Thomas Korman , P.E. Phone: (805) 473 -5464
City of Arroyo Grande
PO Box 550
1375 Ash Street
Arroyo Grande, CA 93421
CC: Michael Linn; Teresa McClish; Shane Taylor
Prepared by: Spencer Waterman
Reviewed by: Joshua Reynolds, P.E., Jeffery Szytel, P.E.
Project : City of Arroyo Grande 2010 Urban Water Management Plan Update
SUBJECT: BASELINE DAILY PER C APITA WATER USE AND TARGET WATER USE - DRAFT
This memorandum presents the procedure used by the City of Arroyo Grande (City) to meet the requirements of
Senate Bill x 7 -7 (SB7) as defined in t he Water Conservation Act of 2009 and incorporated into Division 6 of the
California Water Code, commencing w ith Section 10608 of Part 2.55.
Background
On November 10, 2009, Governor Arnold Schwarzenegger signed Senate Bill x 7 -7 into law. The legislation
requires all water suppliers to achieve a reduction in per capita water use of 20% by December 31, 2020, with an
interim target of 10% reduction by December 31, 2015. The legislation requires each urban water supplier to
develop, and include in its U rban W ater M anagement P lans (UWMPs), estimates of: 1) baseline daily per capita
water use; 2) daily per capita wa ter use target ; 3) daily per capita water use interim target ; 4) compliance daily
per capita water use ; and 5) confirmation that the target meets the minimum water use reduction requirement .
The UWMP must also include bases for determining the estimates, with references to supporting data.
However, SB 7 did not include a detailed description of the allowable methodologies for determining the
required values. Instead, it required California Department of Water Resources (DWR) to develop appropriate
methodo logies and criteria, and to make them available to water suppliers no later than October 1, 2010. In
consideration of this delay, the bill extended the deadline for adoption of the 2010 UWMP to July 1, 2011.
In connection with preparation of the 2010 UWMP update, the City hired Water Systems Consulting, Inc. (WSC)
to develop the required estimates described by S B 7. WSC applied methodologies consistent with those
described in the Methodologies for Calculating Baseline and Compliance Urban Per Capita Water Use guidebook
(Methodologies Guidebook). The procedure used to develop the required SB7 estimates includes the following
basic steps:
9/30/2011
city of arroyo grande_per capita water use memo.docx
1. Calculate baseline water use, which is the average gross daily water use per capita , reported in gallons
per capita per day , based on gross water use and service area population for a continuous 10 -year
period ending no earlier than December 31, 2004 .
2. Calculate the urban water use target using one of the four methods described below
3. Che ck and confirm targets using a selected five -year running average ending no earlier than December
31, 2007 and no later than December 31, 2010.
4. Calculate the interim urban water use target (equal to the average of the baseline and confirmed urban
water us e target)
5. Calculate the compliance daily per capita water use (equal to the gross daily water use per capita during
the final year of the reporting pe riod (i.e. 2010 ))
DWR allows the urban water supplier to choose one of four different methods to calcula te the urban water use
target in Step 2 above.
Method 1 involves calculating the target based on 80% of baseline daily per capita water use and the
interim target based on 90% of the baseline daily per capita water use.
Method 2 involves calculating the per capita daily water use by using the sum of performance standards
applied to indoor residential use, landscaped area water use, and commercial, industrial, and
institutional uses.
Method 3 calculates the water use target as 95% of the applicable state hydrologic region target as
stated in the 20x2020 Water Conservation Plan . The City ’s service area is located in the Central Coast
hydrologic region number 3 as defined in the State’s 20x2020 Water Conservation Plan .
Method 4 is an approach developed by DWR to estimate water savings factors associated with
implementation of various conservation measures. The water savings factors are used to calculate water
use targets. Appendix A and Appendix B show the input and calculation spreadsheets for Method 4.
Gross Water Use
SB 7 defines g ross water use as:
“The total volume of water, whether treated or untreated, entering the distribution system of an urban
retail water supplier, excluding all of the following: (1) Recycled water that is delivered within the service
area of an urban retail water supplier or its urban wholesale water supplier; (2) The net volume of water
that the urban retail water supplier places into long -term storage; (3) The volume of water the urban
retail water supplier conveys for use by another urban water supplier.; (4) The volume of water delivered
for agric ultural use, except as otherwise provided in subdivision (f) of Section 10608.24.”
9/30/2011
city of arroyo grande_per capita water use memo.docx
Groundwater and surface water are the only sources of water for the City . From 199 5 through present , the City
has not stored any water long -term or sold any water to other agencies . Therefore, g ross water use is calculated
as the sum of the City’s total surface water purchases and groundwater production .
Population
The first step in determining the service area population involves establishing the service area boundary and the
customers served within that boundary. WSC worked with City Staff to establish the location of customer
connections outside of City limits served by the City and connections within the City limits not served by the
City. WSC then plotted these connections as points in a map using Geographical Information Systems (GIS)
software. The points contain spatial data linked to a geodatabase with information about each connection.
Figure 1 shows the connections located within City limits served by Oceano Community Services District (OCSD),
connections located outside of City limits served by the City, and connections that will be served by the City in
the future.
9/30/2011
city of arroyo grande_per capita water use memo.docx
Figure 1 . City of Arroyo Grande Water Service Area
9/30/2011
city of arroyo grande_per capita water use memo.docx
To estimate the total population served by the City, WSC subtracted the population within City limits served by
OCSD and added the population outside of City limits served by the City to the 2010 Census popul ation.
Table 1 . Water Service Area Population
Population Area Source 2010
Connections
2010
Population
City Limits Census n/a 17,252
Inside City Limits Served by OCSD Water City Staff & Land Use Element 137 1 329 2
Inside City Limits Served by City Water Calculation (City Limits Census Pop.
minus Pop. Served by OCSD)
n/a 16,923
Outside City Limits Served by City Water City Staff & Land Use Element 9 1 22 2
Total Water Service Area Calculation (Inside City Limits Pop.
plus Outside City Limits Pop.)
n/a 16,945
1 The connections were identified and provided by City Staff.
2 Assumes a persons per residential connection factor of 2.4.
City Staff estimate the service area population each year for the Department of Water Resources Public Water
System Statistics report (DWR reports). The methodology used by City staff to calculate service area population
is very similar to the methodology WSC used to develop its 2010 population estimate. City Staff calculate the
service area population by applying 2.4 persons per household to the number of residential connections served
by OCSD in each year and subtracting that population from the City limi ts population. The population estimated
in the 2010 DWR report is 16,901, a difference of 0.3% from WSC’s estimate of 16,945.
Historical Population
Since census data is not available for interim years between 2000 and 2010, historical population is assume d to
be the same as the estimated service area population presented in the DWR reports for 1994 -2010. Using the
DWR report population estimates allows for consistency between documents and eliminates conflicting
historical records of connection conditions for each year from 1994 through 2010. Figure 2 shows the historical
population as reported in the DWR reports.
9/30/2011
city of arroyo grande_per capita water use memo.docx
Figure 2 . Historical Population
Projected Population
The San Luis Obispo Council of Governments (SLOCOG) develops population projections for San Luis Obispo
County and the cities and communities within the County. SLOCOG projects the population for the City through
20 40 in its San Luis Obispo County 2040 Population, Housing & Employment Forecast (1). The projections are
based on a comprehensive study of historical population trends for California and the County, short -term and
long -term p opulation reports, economic conditions, and consultation with planners from the County. The report
presents three growth scenarios: low, m id , and high. For the purposes of projecting population, WSC used the
mid growth scenario population projections from SLOCOG’s report to develop annual growth rates through
2030. The annual growth rates are applied to the 2010 population to yield the projected populations shown in
Table 2 . The build -out population, defined as the maximum population that can occur considering the zoning
and land use designations of the current General Plan, is established at 20,000 persons based on the City’s
General Plan Housing Element.
Table 2 . Service Area Population Projections
2010 2015 2020 2025 2030
Population 16,901 17,553 17,943 18,552 19,077
Annual Growth
Rate %
n/a 0.76% 0.44% 0.67% 0.56%
9/30/2011
city of arroyo grande_per capita water use memo.docx
Baseline Per Capita Water Use
WSC calculated per capita water use using gross water use values and the population estimates shown in Table
3 . The annual per capita water use value w as averaged across 10 -year period s ranging from 199 5 -200 4 through
2001 -2010 . Figure 3 shows the historical population estimates, along with the annual per capita water use for
the years 1995 through 2010
Table 3 . Baseline Daily Per Capita Water Use
Calenda
r Year
Distribution System
Population
Daily
System
Gross
Water Use
(mgd)
Annual
Daily Per
Capita
Water Use
(gpcd)
10 year
running
average
(gpcd)
1995 15,500 2 151 1996 15,495 2 161 1997 15,495 3 178 1998 15,776 2 157 1999 16,007 3 177
2000 15,851 3 191 2001 16,115 3 183 2002 16,294 3 192 2003 16,623 3 189 2004 16,637 3 193 177
2005 16,682 3 183 180
2006 16,669 3 178 182
2007 16,859 3 190 183
2008 17,136 3 183 186
2009 17,080 3 170 185
2010 16,901 3 156 182
Base line Daily Per Capita Water Use 186
9/30/2011
city of arroyo grande_per capita water use memo.docx
Figure 3 . Population and Historical Per Capita Water Use
Water Use Targets
The baseline daily per capita water use is used to calculate the urban water use target and the interim urban
water use target. The per capita water use target and interim target estimates are calculated using Method 1,
Method 3, and Method 4 from the Methodologies Guidebook . Method 2 was not used due to a lack of available
data. Table 4 shows the estimated daily per capita water use targets for each method analyzed .
Table 4 . Daily Per Capita Water Use Targets
Calculation Method Water Use
Target
(gpcd)
Method 1: 80% of Baseline Per Capita
Water Use 149
Method 2: Performance Standards Not
calculated
Method 3: 95% of Regional Target 117
Method 4: DWR Approach 148
Selected Urban Water Use Target 149
Minimum Water Use Reduction Requirements
The sele cted target must be l ess than 95% of a selected five -year running average ending no earlier than
December 31, 2007 and ending no later than December 31, 2010 per the requirements of California Water Code
Section 10608.22. Table 5 s h ows the minimum water use reduction based on five -year running averages. Table
9/30/2011
city of arroyo grande_per capita water use memo.docx
6 shows the confirm ation that the selected target meet s the minimum water use reduction. Table 7 shows t he
final baseline, compliance, interim target, and target per capita water use. Table 8 shows the status of meeting
the interim target and target based on current comp liance per capita water use. Figure 4 shows the past, current
and projected per capita water use for the Los Angele s County District.
The projected gpcd for interim years between 2010 and 2015 w as calculated uniquely. It is assumed that the low
gpcd experienced in 2010 is a result of multiple temporary factors , such as the economy, wet year hydrologic
conditions , and others . To account for this artificial ly low gpcd it is assumed that the 2011 gpcd will be equal to
the five -year historical average gpcd from 2006 -2010 . The interim years between 2011 and 2015 were
calculated through linear interpolation between the five -year historical average gpcd and the i nterim target
water use . Lastly, the interim years between 2015 and 2020 were calculated through linear interpolation
between the interim target water use and target water use . The values shown will be reported in the City’s 2010
UWMP.
Table 5 . Minimum Water Use Reduction
Calendar
Year
Distribution System
Population
Daily System
Gross Water
Use (mgd)
Annual
Daily Per
Capita
Water
Use
(gpcd)
5 year
running
average
2003 16,623 3 189
2004 16,637 3 193
2005 16,682 3 183
2006 16,669 3 178
2007 16,859 3 190 187
2008 17,136 3 183 185
2009 17,080 3 170 181
2010 16,901 3 156 175
5 -yr Base line Daily Per Capita Water Use 187
Table 6 . Target Confirmation
Selected Urban Water Use Target (gpcd) 149
95% of 5 -year Base Daily Per Capita Water Use (gpcd) 177
Selected Urban Water Use Target < 95% of 5 -year Base GPCD Yes
Confirmed Urban Water Use Target , 2020 (gpcd) 149
9/30/2011
city of arroyo grande_per capita water use memo.docx
Table 7 . Baseline, Compliance, Interim Target, and Target Water Use
Parameter Water Use
(gpcd)
Baseline Daily Per Capita Water Use 186
2010 Daily Per Capita Water Use 156
2015 Interim Urban Water Use Target 167
2020 Urban Water Use Target 149
Table 8 . Water Use Reduction Status
Water Use Reduction (on gpcd basis) % Reduction 1
Achieved by 2010 16.0%
Needed to meet 2015 target -7.1%
Needed to meet 2020 target 4.8%
1 A n egative % means the compliance is currently lower than the target.
Figure 4 . Historical, Current, and Project Per Capita Water Use
9/30/2011
city of arroyo grande_per capita water use memo.docx
Appendix A . User Input - Method 4
9/30/2011
city of arroyo grande_per capita water use memo.docx
Appendix B . Calculator -Method 4
F
Appendix F . DWR Review Checklist
No. UWMP r equirement a
C alif. W ater
C ode r eference Additional c larification UWMP l o cation
PLAN PREPARATION
4 Coordinate the preparation of its plan with other appropriate agencies in
the area, including other water suppliers that share a common source,
water management agencies, and relevant public agencies, to the extent
practicable.
10620(d)(2) Section 1.2.1
6 Notify, at least 60 days prior to the public hearing on the plan required by
Section 10642, any city or county within which the supplier provides water
that the urban water supplier will be reviewi ng the plan and considering
amendments or changes to the plan. Any city or county receiving the
notice may be consulted and provide comments.
10621(b) Section 1.2 ;
A ppendix D
7 Provide supp orting documentation that the UWMP or any amendments to,
or changes in, have been adopted as described in Section 10640 et seq.
10621(c) Section 1.2.3 ;
Section 8.0
54 Provide supporting documentat ion that the urban water management plan
has been or will be provided to any city or county within which it provides
water, no later than 60 days after the submission of this urban water
management plan.
10635(b) Section 1.2
55 Provide supporting documentation that the water supplier has encouraged
active involvement of diverse social, cultural, and economic elements of
the population within the service area prior to and during the preparation
of the plan.
10642 Section 1.2.2 ;
Section 8.1
56 Provide supporting documentation that the urban water supplier made the
plan available for public inspection and held a public hearing about the
plan. For public agencies, the hea ring notice is to be provided pursuant to
Section 6066 of the Government Code. The water supplier is to provide
the time and place of the hearing to any city or county within which the
supplier provides water. Privately -owned water suppliers shall provide an
equivalent notice within its service area.
10642 Section 8.2 ;
Section 1.2 ;
Section 1.2.2
57 Provide supporting documentation that the plan has been adopted as
prepa red or modified.
10642 Section 1.2.3 ;
Section 8.2
58 Provide supporting documentation as to how the water supplier plans to
implement its plan.
10643 Section 8.0
F
No. UWMP r equirement a
C alif. W ater
C ode r eference Additional c larification UWMP l o cation
59 Provide supporting documentation that, in addition to submittal to DWR,
the urban water supplier has submitted this UWMP to the California State
Library and any city or county within which the supplier provides water
supplies a copy of its plan no later th an 30 days after adoption. This also
includes amendments or changes.
10644(a) Section 1.2 ;
Section 8.0
60 Provide supporting documentation that, not later than 30 days after filing a
copy of its p lan with the department, the urban water supplier has or will
make the plan available for public review during normal business hours
10645 Section 1.2 ;
Section 1.2.2
SYSTEM DESCRIPTION
8 Describe the water supplier service area. 10631(a) Section 2.1
9 Describe the climate and other demographic factors of the service area of
the supplier
10631(a) Section 2.2
10 Indicate the current popu lation of the service area 10631(a) Provide the most recent
population data possible. Use
the method described in
―Baseline Daily Per Capita
Water Use.‖ See Section M .
Section 2.2
11 Provide population projections for 2015, 2 020, 2025, and 2030, based on
data from State, regional, or local service area population projections.
10631(a) 2035 and 2040 can also be
provided to support consistency
with Water Supply Assessments
and Written Verification of
Water Supply documents.
Sec tion 2.2
12 Describe other demographic factors affecting the supplier‘s water
management planning.
10631(a) Section 2.2
SYSTEM DEMANDS
1 Provide baseline daily per capita water use, urban water use target,
interim urban water use target, and compliance daily per capita water use,
along with the bases for determining those estimates, including
references to supporting data.
10608.20(e) Section 5.3 ;
Section Appendix
E
2 Wholesalers: Include an assessment of present and proposed future
measures, programs, and policies to help achieve the water use
reductions. Retailers: Conduct at least one public hearing that includes
general discussion of t he urban retail water supplier‘s implementation plan
for complying with the Water Conservation Bill of 2009.
10608.36
10608.26(a)
Retailers and wholesalers have
slightly different requirements
Section 1.2 ;
Section 8.1
F
No. UWMP r equirement a
C alif. W ater
C ode r eference Additional c larification UWMP l o cation
3 Report progress in meeting urban water use targets using the
standardized form.
10608.40 N/A
25 Quantify past, current, and projected water use, identifying the uses
among water use sectors, for the following: (A) single -family r esidential,
(B) multifamily, (C) commercial, (D) industrial, (E) institutional and
governmental, (F) landscape, (G) sales to other agencies, (H) saline
water intrusion barriers, groundwater recharge, conjunctive use, and (I)
agriculture.
10631(e)(1) Consid er ‗past‘ to be 2005,
present to be 2010, and
projected to be 2015, 2020,
2025, and 2030. Provide
numbers for each category for
each of these years.
Section 5.1 ;
Section 5.4
33 Provide documentatio n that either the retail agency provided the
wholesale agency with water use projections for at least 20 years, if the
UWMP agency is a retail agency, OR, if a wholesale agency, it provided
its urban retail customers with future planned and existing water source
available to it from the wholesale agency during the required water -year
types
10631(k) Average year, single dry year,
multiple dry years for 2015,
2020, 2025, and 2030.
Section 1.2.1 ;
A ppendix D
34 Include projected water use for single -family and multifamily residential
housing needed for lower income households, as identified in the housing
element of any city, county, or city and county in the service area of the
supplier.
10631.1 (a) Section 5.2.6
SYSTEM SUPPLIES
13 Identify and quantify the existing and planned sources of water available
for 2015, 2020, 2025, and 2030.
10631(b) The ‗existing‘ water sources
should be for the same year as
the ―current population‖ in line
10. 2035 and 2040 can also be
provided.
Section 3.0
14 Indicate whether groundwater is an existing or planned source of water
available to the supplier. If yes, then complete 15 through 21 of the
UWMP Chec klist. If no, then indicate ―not applicable‖ in lines 15 through
21 under the UWMP location column.
10631(b) Source classifications are:
surface water, groundwater,
recycled water, storm water,
desalinated sea water,
desalinated brackish
groundwater, and other.
Section 3.3
15 Indicate whether a groundwater management plan been adopted by the
water supplier or if there is any other specific authorization for
groundwater management. Include a copy of the plan or authorization.
1 0631(b)(1) Section 3.3
16 Describe the groundwater basin. 10631(b)(2) Section 3.3
17 Indicate whether the groundwater basin is adjudicated? Include a copy of
the court order or decree.
10631(b)(2) Section 3.3 ;
A ppendix A
F
No. UWMP r equirement a
C alif. W ater
C ode r eference Additional c larification UWMP l o cation
18 Describe the amount of groundwater the urban water supplier has the
legal right to pump under the order or decree. If the basin is not
adjudicated, indicate ―n ot applicable‖ in the UWMP location column.
10631(b)(2) Section 3.3
19 For groundwater basins that are not adjudicated, provide information as to
whether DWR has identified the basin or basins as overdrafted or has
projected that the basin will become overdrafted if present management
conditions continue, in the most current official departmental bulletin that
characterizes the condition of the groundwater basin, and a detailed
description of the efforts being undertaken by th e urban water supplier to
eliminate the long -term overdraft condition. If the basin is adjudicated,
indicate ―not applicable‖ in the UWMP location column.
10631(b)(2) Section 3.3.2
20 Provide a detailed description and analy sis of the location, amount, and
sufficiency of groundwater pumped by the urban water supplier for the
past five years
10631(b)(3) Section 3.3
21 Provide a detailed description and analysis of the amount and location of
groun dwater that is projected to be pumped.
10631(b)(4) Provide projections for 2015,
2020, 2025, and 2030.
Section 3.3
24 Describe the opportunities for exchanges or transfers of water on a short -
term or long -term basis.
10631(d) Section 3.4.1
30 Include a detailed description of all water supply projects and programs
that may be undertaken by the water supplier to address water supply
reliability in average, single -dry, and multiple -dry years, exclud ing demand
management programs addressed in (f)(1). Include specific projects,
describe water supply impacts, and provide a timeline for each project.
10631(h) Section 3.4 ;
Section 3.4.1
31 Descri be desalinated water project opportunities for long -term supply,
including, but not limited to, ocean water, brackish water, and
groundwater.
10631(i) Section 3.4.2
44 Provide information on recycled water and its potential for use as a water
source in the service area of the urban water supplier. Coordinate with
local water, wastewater, groundwater, and planning agencies that operate
within the supplier's service area.
10633 Section 6.16
45 Des cribe the wastewater collection and treatment systems in the
supplier's service area, including a quantification of the amount of
wastewater collected and treated and the methods of wastewater
disposal.
10633(a) Section 0
F
No. UWMP r equirement a
C alif. W ater
C ode r eference Additional c larification UWMP l o cation
46 Describe the quantity of treated wastewater that meets recycled water
standards, is being discharged, and is otherwise available for use in a
recycled water project.
10633(b) Section 6.16
47 Describe the recycled water curren tly being used in the supplier's service
area, including, but not limited to, the type, place, and quantity of use.
10633(c) Section 6.16
48 Describe and quantify the potential uses of recycled water, including, but
not limit ed to, agricultural irrigation, landscape irrigation, wildlife habitat
enhancement, wetlands, industrial reuse, groundwater recharge, indirect
potable reuse, and other appropriate uses, and a determination with
regard to the technical and economic feasibil ity of serving those uses.
10633(d) Section 6.16.2
49 The projected use of recycled water within the supplier's service area at
the end of 5, 10, 15, and 20 years, and a description of the actual use of
recycled water in comp arison to uses previously projected.
10633(e) Section 6.16.2
50 Describe the actions, including financial incentives, which may be taken to
encourage the use of recycled water, and the projected results of these
actions in te rms of acre -feet of recycled water used per year.
10633(f) Section 6 .16
51 Provide a plan for optimizing the use of recycled water in the supplier's
service area, including actions to facilitate the installation of dual
distr ibution systems, to promote recirculating uses, to facilitate the
increased use of treated wastewater that meets recycled water standards,
and to overcome any obstacles to achieving that increased use.
10633(g) Section 6.16
W ATER SHORTAGE RELIABILITY AND WATER SHORTAGE CONTINGENCY PLANNING b
5 Describe water management tools and options to maximize resources
and minimize the need to import water from other regions.
10620(f) Section 3.1 3.1
22 Describe the reliability of the water supply and vulnerability to seasonal or
climatic shortage and provide data for (A) an average water year, (B) a
single dry water year, and (C) multiple dry water years.
10631(c)(1) Section 4.0
23 For any water source that may not be available at a consistent level of
use - given specific legal, environmental, water quality, or climatic factors
- describe plans to supplement or replace that source with alternative
sources or water demand management measures, to the extent
practicable.
10631(c)(2) Section 4.0
35 Provide an urban water shortage contingency analysis that specifies
stages of action, including up to a 50 -percent water suppl y reduction, and
an outline of specific water supply conditions at each stage
10632(a) Section 5.7
F
No. UWMP r equirement a
C alif. W ater
C ode r eference Additional c larification UWMP l o cation
36 Provide an estimate of the minimum water supply available during each of
the next three water years based on the driest thr ee -year historic
sequence for the agency's water supply.
10632(b) Section 4.3.1 ;
Section 5.7
37 Identify actions to be undertaken by the urban water supplier to prepare
for, and implement during, a catastrophic interruption of water supplies
including, but not limited to, a regional power outage, an earthquake, or
other disaster.
10632(c) Section 5.7
38 Identify additional, mandatory prohibitions against specific wate r use
practices during water shortages, including, but not limited to, prohibiting
the use of potable water for street cleaning.
10632(d) Section 5.7
39 Specify consumption reduction methods in the most restrictive stages.
Ea ch urban water supplier may use any type of consumption reduction
methods in its water shortage contingency analysis that would reduce
water use, are appropriate for its area, and have the ability to achieve a
water use reduction consistent with up to a 50 percent reduction in water
supply.
10632(e) Section 5.7
40 Indicated penalties or charges for excessive use, where applicable. 10632(f) Section 5.7
41 Provide an analysis of the impacts of each of the actions and conditions
described in subdivisions (a) to (f), inclusive, on the revenues and
expenditures of the urban water supplier, and proposed measures to
overcome those impacts, such as the development of reserves and rate
adjustments.
10632(g) Section 5.7
42 Provide a draft water shortage contingency resolution or ordinance. 10632(h) Section 5.7
43 Indicate a mechanism for determining actual reductions in water use
pursuant to the urban water shortage contingency analysis.
10632(i) Section 5.7
52 Provide information, to the extent practicable, relating to the quality of
existing sources of water available to the supplier over the same five -year
increme nts, and the manner in which water quality affects water
management strategies and supply reliability
10634 For years 2010, 2015, 2020,
2025, and 2030
Section 7.0
F
No. UWMP r equirement a
C alif. W ater
C ode r eference Additional c larification UWMP l o cation
53 Assess the water supply reliability during normal, dry, and multiple dry
water years by comparing the total water supply sources available to the
water supplier with the total projected water use over the next 20 years, in
five -year increments, for a normal water year, a single dry water year, and
multiple dry wate r years. Base the assessment on the information
compiled under Section 10631, including available data from state,
regional, or local agency population projections within the service area of
the urban water supplier.
10635(a) Section 5.7
D EMAND M ANAGEMENT M EASURES
26 Describe how each water demand management measures is being
implemented or scheduled for implementation. Use the list provided.
10631(f)(1) Discuss each DMM, even if it is
not currently or planned for
implementa tion. Provide any
appropriate schedules.
Section 6.15
27 Describe the methods the supplier uses to evaluate the effectiveness of
DMMs implemented or described in the UWMP.
10631(f)(3) Section 6.15
28 Provide an estimate, if available, of existing conservation savings on
water use within the supplier's service area, and the effect of the savings
on the ability to further reduce demand.
10631(f)(4) Section 6.15
29 Eva luate each water demand management measure that is not currently
being implemented or scheduled for implementation. The evaluation
should include economic and non -economic factors, cost -benefit analysis,
available funding, and the water suppliers' legal au thority to implement the
work.
10631(g) See 10631(g) for additional
wording.
Section 6.15
32 Include the annual reports submitted to meet the Section 6.2
requirements, if a member of the CUWCC and signer of the December
10, 2 008 MOU.
10631(j) Signers of the MOU that submit
the annual reports are deemed
compliant with Items 28 and 29.
N/A
P.O. Box 4255
San Luis Obispo, CA 93403