1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
September 15, 2025
September 15, 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 294,200 360,360 66,160 81.6% 83.6%
Cherry 243,900 273,345 29,445 89.2% -
Eleanor 20,090 27,100 7,010 74.1% -
Water Bank 570,000 570,000 0 100.0% 99.8%
Total Tuolumne Storage 1,128,190 1,230,805 102,615 91.7% - Local System
Calaveras 71,106 96,670 25,564 73.6% -
San Antonio 48,216 53,266 5,050 90.5% -
Crystal Springs 48,147 68,953 20,806 69.8% -
San Andreas 15,915 18,675 2,760 85.2% -
Pilarcitos 1,784 3,125 1,341 57.1% -
Total Local Storage 185,168 240,689 55,521 76.9% -
Total System Storage 1,313,358 1,471,494 158,136 89.3% 82.1% Total without water bank 743,358 901,494 158,136 82.5% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
September 14, 2025
12-Month Median Total: 30.92 inches
Current Year Total: 29.11 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of September 14, 2025
12-Month Median Total: 23.35 inches
Current Year Total: 22.80 inches
7 Annual Comparison:
Water Available to the City
8 Tuolumne River Water Available
to the City
9 Upcountry
Precipitation
Forecast
10 Bay Area
Precipitation
Forecast
11 Total Deliveries
12