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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 Update (6.4.24) - Reservoirs remain above average levels

Reservoir storage started water year at high historical levels and remained above average through winter months due to conservation, wet weather, and the District's operational strategy, including maximizing purchases of Sonoma Water supplemental water in the late summer and early fall. 

Despite current healthy reservoir supplies, Marin Water recognizes that drought will continue to be a regular occurrence in California. Therefore, the District is using this gift of time to continue working to strengthen our water supply resiliency, focusing on projects that will improve and expand our existing storage while also working to develop new supplies so that we are better positioned to weather future periods of extended drought. 

Building water supply resiliency also requires community effort, and the District encourage customers to continue to embrace the water saving practices learned and implemented in the past few years as a daily habit, whether the community is experiencing a year of heavy rain or times of drought.

Water Production

Week EndingAverage Million Gallons Per Day
Same Week in 202322.27
Supply Source: 
Same Week in 202310.25
Russian River4.06
Same Week in 202312.02

Additional resource: Annual Customer Water Usage Data 


Rainfall at Lake Lagunitas (average annual rainfall is 52.65 inches)Inches
7/01/2023 - 6/12/202462.23
Same period last year76.96
Average year-to-date52.02
Rainfall for last 24 hours0.00

Summary:  Current rainfall (62.23 inches) is 119.63% of the average rainfall (52.02 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 6/12/202476,19995.77%
Storage for this date last year77,62997.57%
Average storage for this date68,37785.94%

Summary:  Current storage (76,199 AF) is 111.44% of the average storage (68,377 AF) for this date.

Reservoir Diversion Data

By Reservoir: