1 San Francisco Public Utilities Commission
Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
September 2, 2025
September 2, 2025, Reservoir Storage
2 Reservoir
Current
Storage1,2,3
Maximum
Storage4
Available
Capacity
Percent of
Maximum
Storage
Normal
Percent of
Maximum
Storage5
(AF) (AF) (AF)
Tuolumne System
Hetch Hetchy 306,200 360,360 54,160 85.0% 87.2%
Cherry 241,500 273,345 31,845 88.3% -
Eleanor 23,730 27,100 3,370 87.6% -
Water Bank 570,000 570,000 0 100.0% 100.0%
Total Tuolumne Storage 1,141,430 1,230,805 89,375 92.7% - Local System
Calaveras 71,699 96,670 24,971 74.2% -
San Antonio 48,416 53,266 4,850 90.9% -
Crystal Springs 47,560 68,953 21,393 69.0% -
San Andreas 15,472 18,675 3,203 82.8% -
Pilarcitos 1,808 3,125 1,317 57.9% -
Total Local Storage 184,955 240,689 55,734 76.8% -
Total System Storage 1,326,385 1,471,494 145,109 90.1% 83.8% Total without water bank 756,385 901,494 145,109 83.9% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
September 1, 2025
12-Month Median Total: 30.92 inches
Current Year Total: 29.06 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of September 1, 2025
12-Month Median Total: 23.35 inches
Current Year Total: 22.66 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 Tuolumne River Water Available
to the City
10 11
California Precipitation Forecast
12 Upcountry Precipitation Forecast
Total Deliveries
13