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Water Watch

Clear water wave

Water Watch

About 75% of the District's water supply originates from rainfall on our Mt. Tamalpais watershed and in the grassy hills of west Marin, flowing into the District’s seven reservoirs. 

The District also supplements its supply with water from the Sonoma County Water Agency (SCWA), which comes from the Russian River system in Sonoma County. The Russian River water supply originates from rainfall that flows into Lake Sonoma and Lake Mendocino.

Learn more about our water supply, reservoir levels, and recent rainfall in the tables below. 

Water Production

Week Ending Average Million
Gallons Per Day
05/26/2022 22.03
Same Week in 2021 23.38
Supply Source:  
          Reservoirs 10.29
          Same Week in 2021
          Russian River 11.74
          Same Week in 2021 8.52


Rainfall at Lake Lagunitas (average annual rainfall is 52.65 inches) Inches
7/01/2021 - 05/26/2022 48.93
Same period last year 20.62
Average year-to-date 51.64
Rainfall for last 24 hours 0.00

For daily rainfall totals for this fiscal year to date, please refer to Rainfall & Reservoir Data - Current Fiscal Year.

Current rainfall (48.93 inches) is 94.75% of the average rainfall (51.64 inches) for this date.

Reservoir Storage

Alpine, Bon Tempe, Kent, Lagunitas, Nicasio, Phoenix & Soulajule Reservoirs
(total capacity 79,566 acre-feet)
Acre-feet % of Capacity
Storage as of 05/26/2022 70,445 88.54%
Storage for this date last year 38,000 47.76%
Average storage for this date 70,020 88.00%

Current storage (70,445 AF) is 100.61% of the average storage (70,020 AF) for this date.