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About Our Water System

Our Distribution System

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Map shows Marin Water District's water system, including the Russian River in the north.

 

View enlarged PDF of the map

Chartered in 1912, Marin Water is California’s first and the oldest municipal water district. We are proud to provide locally sourced water to more than 191,000 customers in central and southern Marin County.

About 75% of our water supply originates from rainfall on 22,000 acres of our protected Mt. Tamalpais watershed and in the grassy hills of west Marin. Rainfall from the watershed flows into the District’s seven reservoirs. The water is treated at our treatment plants and then travels through our extensive distribution system, including 908 miles of pipes, 130 storage tanks and 97 pump stations before making its way to your home or business. The District also supplements its water supply with water from the Sonoma County Water Agency, 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, and it is naturally filtered through 80 feet of sand beds adjacent to the river. It then goes through a treatment process and is blended with the District’s reservoir water within its distribution system.

 

Learn about our District's commitment to water quality

 

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steam on mount tamalpais

22k

Acres of Watershed
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Alpine Dam in Spring

7

Reservoirs
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Bon Tempe Treatment Plant Aerial

3

Treatment Plants
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pump station at sunset

97

Pump Stations
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Storage Tank on Hill

130

Storage Tanks
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pipe with construction in background

908

Miles of Pipeline
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water quality lab with beaker

115k

Water Quality Tests per Year
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glass of water under faucet

191k

Customers Served

Storage & Treatment

Learn more about our water supply storage
and treatment facilities at our dedicated page.

Visit Here