2025 Urban Water
Management Plan
City of Santa Monica Council
Meeting
June 23, 2026
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Urban Water Management Plan (UWMP)
• Required for every urban water supplier that
provides over 3,000 AF of water annually or
serves 3,000 or more service connections
• Supports long-term water resource planning
• Initially passed in 1983, but has been amended
several times since
• Water Shortage Assessment and Water
Shortage Contingency Plan added in 2020
• No major updates to requirements since 2020
submission cycle
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Water Use Characterization
Historical Water Usage and Population in Santa Monica (2015-2025) Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Water Use Characterization
Historical Water Usage in Santa Monica by Sector (2015-2025) Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Water Use Characterization
2030 2035 2040 2045
Single Family Residential 2,642 2,645 2,649 2,652
Multi-Family Residential 5,708 5,844 5,980 6,117
Commercial and Industrial 2,618 2,566 2,514 2,462
Institutional and Governmental 306 300 294 288
Landscape 759 1,147 1,535 1,924
Other (Fire) 24 36 48 60
Subtotal 12,057 12,539 13,021 13,502
Distribution Loss (5%) 603 627 651 675
Total 12,660 13,166 13,672 14,178
Total w/Additional Conservation 11,240 10,913 10,906 10,631 Projected Water Use in Santa Monica (2030-2045)
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Water Supply and Service Reliability
• Reliability for all scenarios analyzed (i.e., supply surplus) • Assessment period = 2010 through 2020
(data from 2021-2025 not used for assessment)
• Normal Year = average during the 10-year period
• Single-Dry Year = lowest groundwater pumped during
the period
• Multiple-Dry Year (5-year) = running average during the assessment period to determine lowest five consecutive
years
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Water Supply Characterization
• Local groundwater comes from the City's wellfields
(Charnock, Arcadia, and Olympic)
• Imported water supply comes from Metropolitan Water
District of Southern California (MWD) – Colorado River or State Water Project
SOURCE NORMAL YEAR1 SINGLE DRY YEAR AVERAGE FIVE-YEAR
CONSECUTIVE DROUGHT
Local Groundwater 7,121 AFY 5,181 AFY 7,203 AFY
Imported Water Supply 7,406 AFY2 7,406 AFY2 7,406 AFY2
Total 14,527 AFY 12,587 AFY 14,609 AFY
1The normal year is estimated using the average of total water supply available from 2010 through 2020 2Lowest MWD Tier 1 allotment was assumed.
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Water Service Reliability
YEAR TYPE % OF AVERAGE
SUPPLY
GROUNDWATER1
(ACRE-FEET)
IMPORTED
WATER2
(ACRE-FEET)
TOTAL
(ACRE-FEET)
Normal 100% 10,660 7,406 18,066
Single Dry Year 76% 8,102 7,406 15,508
Dry Year 1 96% 10,234 7,406 17,640
Dry Year 2 88% 9,381 7,406 16,787
Dry Year 3 89% 9,487 7,406 16,893
Dry Year 4 90% 9,594 7,406 17,000
Dry Year 5 76% 8,102 7,406 15,508 1 Includes water loss due to treatment process (i.e. reverse osmosis). 2 MWD Tier 1 Allotment was 11,407 AF for 2010-2012, 11,110 AFY for 2013-2014, and 7,406 AFY for 2016- 2020. MWD Tiers no longer exist for current UWMP update.
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Water Shortage Contingency Plan
Water
Shortage
Stage
Shortage
Level
Water Shortage
Condition
Water Use
Restrictions
City-wide Use
Reduction Goal
Stage 1 ≤10% Minimal Voluntary 10%
Stage 2 10-20% Moderate Mandatory 20%
Stage 3 20-30% Significant Mandatory 30%
Stage 4 30-40% Severe Mandatory 40%
Stage 5 40-50% Critical Mandatory 50%
Stage 6 >50% Catastrophic Mandatory >50%
• No major updates since 2020; still 6 stages in water shortage levels • City’s Demand Reduction Actions (Stage 2) remain the same Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
Requested Action and Next Steps
• Request Council to adopt the resolution for the 2025 Urban Water Management Plan and Water Shortage Contingency
Plan
• Submit 2025 Urban Water Master Plan and Water Shortage Contingency Plan to DWR by July 1, 2026
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026
THANK YOU
Item 12-C
June 23, 2026
Item 12-C
June 23, 2026