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Water Watch

Clear water wave

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
9/21/2023 24.40
Same Week in 2022 21.03
Supply Source:  
          Reservoirs 13.51
          Same Week in 2022 18.27
          Russian River 10.89
          Same Week in 2022 2.76



Rainfall at Lake Lagunitas (average annual rainfall is 52.65 inches) Inches
7/01/2023 - 9/21/2023 0.02
Same period last year 1.49
Average year-to-date 0.50
Rainfall for last 24 hours 0.00

Summary:  Current rainfall (0.02 inches) is 4.00% of the average rainfall (0.50 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 9/21/2023 69,092 86.84%
Storage for this date last year 59,384 74.63%
Average storage for this date 55,800 70.13%

Summary:  Current storage (69,092 AF) is 123.83% of the average storage (55,800 AF) for this date.

Reservoir Diversion Data

By Reservoir: