1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
April 20, 2026
April 20, 2026, 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 351,300 360,360 9,060 97.5% 63.6%
Cherry 264,500 273,345 8,845 96.8% -
Eleanor 25,750 27,100 1,350 95.0% -
Water Bank 570,000 570,000 0 100.0% 98.6%
Total Tuolumne Storage 1,211,550 1,230,805 19,255 98.4% - Local System
Calaveras 61,340 96,670 35,330 63.5% -
San Antonio 44,564 53,266 8,702 83.7% -
Crystal Springs 45,960 68,953 22,993 66.7% -
San Andreas 16,261 18,675 2,414 87.1% -
Pilarcitos 1,910 3,125 1,215 61.1% -
Total Local Storage 170,035 240,689 70,654 70.6% -
Total System Storage 1,381,585 1,471,494 89,909 93.9% 80.7% Total without water bank 811,585 901,494 89,909 90.0% - Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
April 19, 2026
12-Month Median Total: 30.92 inches
Current Year Total: 27.20 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of April 19, 2026
12-Month Median Total: 23.35 inches
Current Year Total: 23.84 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 10
California Precipitation Forecast
11 Upcountry Precipitation Forecast
Total Deliveries
12