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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
3/26/2023 13.63
Same Week in 2022 18.39
Supply Source:  
          Reservoirs 12.92
          Same Week in 2022 7.51
          Russian River 0.71
          Same Week in 2022 10.88



Rainfall at Lake Lagunitas (average annual rainfall is 52.65 inches) Inches
7/01/2022 - 3/26/2023 70.01
Same period last year 43.64
Average year-to-date 45.68
Rainfall for last 24 hours 0.00

Summary:  Current rainfall (70.01 inches) is 153.26% of the average rainfall (45.68 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 3/26/2023 79,520 99.94%
Storage for this date last year 72,800 91.50%
Average storage for this date 72,732 91.41%

Summary:  Current storage (79,520 AF) is 109.33% of the average storage (72,732 AF) for this date.

Reservoir Diversion Data

By Reservoir: