1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
July 20, 2026
July 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 347,400 360,360 12,960 96.4% 97.8%
Cherry 255,600 273,345 17,745 93.5% -
Eleanor 25,650 27,100 1,450 94.6% -
Water Bank 570,000 570,000 0 100.0% 99.9%
Total Tuolumne Storage 1,198,650 1,230,805 32,155 97.4% - Local System
Calaveras 56,658 96,670 40,012 58.6% -
San Antonio 43,790 53,266 9,476 82.2% -
Crystal Springs 43,626 68,953 25,327 63.3% -
San Andreas 16,270 18,675 2,405 87.1% -
Pilarcitos 1,921 3,125 1,204 61.5% -
Total Local Storage 162,265 240,689 78,424 67.4% -
Total System Storage 1,360,915 1,471,494 110,579 92.5% 88.6% Total without water bank 790,915 901,494 110,579 87.7% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
July 19, 2026
12-Month Median Total: 30.92 inches
Current Year Total: 30.43 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of July 19, 2026
12-Month Median Total: 23.35 inches
Current Year Total: 25.98 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 California
Precipitation
Forecast
10 Upcountry
Precipitation
Forecast
11 Total Deliveries
12