HomeMy WebLinkAboutCC 2025-08-12_11.a. 2024 NCMA Annual Report_PP PresentationNCMA 2024 Annual Report
Ag Representatives Meeting
GSI Water Solutions, Inc.
July 24, 2025
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Presentation Overview
Introduction
Goal: Coordination with Ag Reps
2024 Hydrology (Precipitation and Evapotranspiration)
2024 Water Use
Groundwater Basin Conditions
Key Findings
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Santa Maria Groundwater Basin (SMGB)
Three management areas:
Northern Cities Management Area
(NCMA)
Nipomo Mesa Management Area
(NMMA)
Santa Maria Valley Management Area (SMVMA)
Court ordered monitoring program and Annual Report (Santa Maria Groundwater Basin Adjudication)
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prepared pursuant to the requirements of the 2005 Stipulation for the Santa Maria Groundwater Basin Adjudication (2005 Stipulation) and the January 25, 2008 Judgment After Trial (2008
Judgment).
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Northern Cities Management Area
City of Arroyo Grande
City of Pismo Beach
City of Grover Beach
Oceano Community Services District
Private Users
Agricultural Irrigation
Rural Use
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2024 Hydrology
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Average annual rainfall –
15.6 inches
Rainfall in 2024: 15.42 inches
Above average rainfall in
4 of 12 months
ETo1 exceeded rainfall in 5 of 12 months
1 – Reference Evapotranspiration (ETo) recorded at Nipomo CIMIS Station
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NCMA Agricultural Land in 2024
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Estimated Agricultural Pumpage in 2024
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NCMA Pumpage from SMGB in 2024
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NCMA Total Water Use in 2024
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Historical NCMA Production/Delivery
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No figure like this in 2024 annual report
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Locations of Monitoring Wells
5 coastal well clusters
15 wells total
Deep Well Index:
Average of water levels in 3 coastal wells:
(24B03, 30F03, and 30N02)
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Groundwater
Levels
Spring 2024
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Yellow Contours:
Alluvial Aquifer (Cienega Valley)
Blue Contours:
Deep Aquifer System
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Groundwater
Levels
Fall 2024
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Yellow Contours:
Alluvial Aquifer (Cienega Valley)
Blue Contours:
Deep Aquifer System
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Historical Deep Well Index
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Deep Well Index at end of 2024 was 11.5 ft, 4 feet higher than threshold value.
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Key Findings
Total 2024 NCMA Water Use – 7,783 AF
(7,403 AF in 2023)
Lopez Lake – 4,173 AF (3,493 AF in 2023)
State Water Project – 661 AF
(1,213 AF in 2023)
Groundwater – 2,949 AF (2,697 AF in 2023)
Other Groundwater – 0 AF
(0 AF in 2023)
Total Urban Water Use – 5,356 AF
(second lowest in 20 years!)
Total Agricultural Irrigation – 2,307 AF
Groundwater pumping is 31% of 9,500 AFY safe yield
Estimated increase of 530 AF of groundwater in storage (April 2023 to April 2024)
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Questions?
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