GSP Annual Report
4-011.01 SANTA MONICA
2024 (OCT. 2023 - SEP. 2024)
Single Annual Report
GSP Annual Report Information Comments
03/31/2025 1:39 PM
2024 (OCT. 2023 - SEP. 2024)
Single Annual Report
A Groundwater Extraction
Total Groundwater Extractions (AF)
5,377
Water Use Sectors
5,242
0
0
0
0
0
135
Groundwater production for remediation of groundwater contamination zone.
B Groundwater Extraction Methods
Meters
3,009
Direct
90-100 %
Municipal water use is metered
Accuracy varies between meters, but meters are calibrated
Electrical Records
0
Land Use
2,233
Estimate
70-80 %
Golf course evapotranspiration based on irrigated acreage, with the exception of one golf course where extractions are metered
Based on previous studies and uncertainty in the water use consumption factor
Groundwater Model
0
Other
135
Estimate
50-60 %
Estimated groundwater pumped for remediation of contamination in the southern part of the subbasin from playa vista groundwater monitoring reports
Based on reported volumes in groundwater monitoring reports and extrapolated volumes for the third quarter of 2024 (last three months of water year 2024) for which measured data were not available at the time the water year 2024 annual report was prepared
C Surface Water Supply
Total Surface Water Supply (AF)
61,314
Methods Used to Determine
The total imported water used is estimated as the per capita water demand minus the groundwater extracted for M&I use. Groundwater extraction volumes were reported by the City of Santa Monica. Per capita water use is based on the weighted average per capita water use reported by the Los Angeles Department of Water and Power (LADWP), the City of Santa Monica, Golden State Water Company, and the City of Beverly Hills.
Water Source Types
0
0
0
0
0
0
0
61,314
LA Aqueduct and MWD, the distribution between the two sources is unknown
D Total Water Use
Total Water Use (AF)
66,742
Methods Used to Determine
Total water use is the combination of reported groundwater extractions, estimated groundwater extractions, and estimated imported water use.
Water Source Types
5,377
61,314
51
0
0
Water Use Sectors
66,607
0
0
0
0
0
135
Groundwater extracted for remediation of groundwater contamination.
E Change in Storage
Method used to calculate change in storage
Change in storage estimates were calculated for each principal aquifer in the Subbasin using the Los Angeles Coastal Plain Groundwater Model (LACPGM) developed by the United States Geological Survey.
F Monitoring Network Module
G PMA Module
PMA Implementation Updates Implementation Update Export (CSV) PMA Export (CSV)
| PMA ID | PMA Name | Lead GSA | Status | # Updates during WY |
|---|---|---|---|---|
| 4-011.01_PMA_1 | Adjust Groundwater Production As-Needed to Meet Water Level and/or Seawater Intrusion Objectives | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_2 | Impose Replenishment or Imported Water Purchase/Pumping Offset Fee | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_3 | Develop a Salt Nutrient Management Plan for the Subbasin | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_4 | Develop a Groundwater Allocation for the Subbasin | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_5 | Increase Water Conservation | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_6 | Increase Recycled Water Production for Non-Potable and Potable Reuse | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_7 | Recharge Local Groundwater Aquifers | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_8 | Production Efficiency Enhancement at Arcadia WTP | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_9 | Install Additional Monitoring Wells | Santa Monica Basin GSA | Submitted | 0 |
| 4-011.01_PMA_10 | Conduct Additional Investigations and/or Technical Studies | Santa Monica Basin GSA | Submitted | 0 |
