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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
11/30/2022 16.36
Same Week in 2021 14.24
Supply Source:  
          Reservoirs 11.56
          Same Week in 2021 2.76
          Russian River 4.80
          Same Week in 2021 11.48


Rainfall at Lake Lagunitas (average annual rainfall is 52.65 inches) Inches
7/01/2022 - 11/30/2022 4.06
Same period last year 22.85
Average year-to-date 9.67
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 (4.06 inches) is 41.99% of the average rainfall (9.67 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 11/29/2022 53,750 67.55%
Storage for this date last year 45,847 57.62%
Average storage for this date 52,581 66.08%

Current storage (54,750 AF) is 102.22% of the average storage (52,581 AF) for this date.