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Water Watch

Clear water wave

Current Reservoir Levels and Recorded Rainfall Data

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. Please note: Data on this page is typically updated M-F, with the exception of District-observed holidays. Data may occasionally be delayed in posting. 

Supply Status Winter Update - Reservoirs remain above average levels

The total water storage in Marin Water’s seven drinking water reservoirs remains well above average for this time of year, and recent and forecasted rainstorms will likely help continue that trend. Marin Water has been able to maintain high local storage levels the past two years primarily from receiving above average rainfall in both the 2023 and 2024 water years, combined with conservation and operational strategies put in place to bolster the District’s water supply resiliency following the 2021 local water shortage emergency. Despite current healthy reservoir supplies, Marin Water recognizes that drought will continue to be a regular occurrence in California and so our work to implement our Water Supply Roadmap remains ongoing. The Roadmap identifies potential projects that will improve and expand existing storage while also outlining opportunities to develop new supplies so that the District is better positioned to weather future periods of extended drought.

Water Production

Week EndingAverage Million Gallons Per Day
04/10/202514.32
Same Week in 202414.01
Supply Source: 
Reservoirs13.75
Same Week in 202413.35
Russian River0.57
Same Week in 20240.66
  


Additional resource: Annual Customer Water Usage Data 
 

Rainfall

Rainfall at Lake Lagunitas (average annual rainfall is 52.65 inches)Inches
7/01/2024 - 04/10/202552.99
Same period last year58.25
Average year-to-date48.03
Rainfall for last 24 hours0.00

Summary:  Current rainfall (52.99 inches) is 110.33% of the average rainfall (48.03 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 04/10/202579,566100.00%
Storage for this date last year79,56099.99%
Average storage for this date71,24389.54%

Summary:  Current storage (79,566 AF) is 111.68% of the average (71,243 AF) for this date.

Reservoir Diversion Data

By Reservoir: