Current Sources

The residents of southern and central Marin are served by a unique water supply system. The district obtains 75 percent of the water consumed annually from rainfall collected in seven reservoirs in Marin. Five of the reservoirs are on the Mount Tamalpais Watershed and the other two are located in West Marin. The remaining 25 percent of our water comes from the Russian River in Sonoma County under a contract with the Sonoma County Water Agency.

1 - One acre foot is 325,851 gallons, enough water to cover one acre (about the size of a football field) to a depth of one foot.
2 - Enlarged in 1924 and 1941.
3 - Enlarged in 1982.

For current reservoir storage levels, select the most recent PDF or Microsoft® Word document below. (Click here for archives of past reports.)

Call 415-945-1533 for a recorded message of our weekly rainfall and reservoir storage information.

We started importing water from the Russian River under a contract to augment local supplies in the mid-1970s. District voters approved a bond measure in 1992 to increase incrementally the quantity of water from the Russian River, improving the reliability of this important water source.

This water originates at Lake Mendocino in Mendocino County and flows 55 miles down the Russian River to the Wohler Pump Station. Along the way the flow is augmented by releases from Warm Springs Dam, the contractual source of our water. At Wohler, located 8 miles northwest of Santa Rosa, water is removed from the river using a below-ground collection and filtration system. The water is disinfected and transported to customers in Sonoma and Marin counties.