Skip to main content

About Our Water System

Return to Capital Improvement Program

Our Distribution System

 

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 percent 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 (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, 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.

 

Read The Annual Water Quality Report

Your Water's Journey from Source to Tap

It all starts with a raindrop on the Mount Tamalpais Watershed. Learn more about the complex local system your water travels through to ensure it is clean, safe and delivered to your tap every time you need it. 

Our Water Service Operation at a Glance

Image
steam on mount tamalpais

22k

Acres of Watershed
Image
Alpine Dam in Spring

7

Reservoirs
Image
Bon Tempe Treatment Plant Aerial

3

Treatment Plants
Image
pump station at sunset

97

Pump Stations
Image
Storage Tank on Hill

130

Storage Tanks
Image
pipe with construction in background

908

Miles of Pipeline
Image
water quality lab with beaker

115k

Water Quality Tests per Year
Image
glass of water under faucet

191k

Customers Served

Water Supply

For more information about our water supply visit our Water Watch Page.

Visit Here