Water Supply

Where Does My Water Come From?

Santa Rosa's primary source of water is from the Russian River supplied by the Sonoma Water (Sonoma County Water Agency). Sonoma Water pumps water that is naturally filtered through rock, sand and gravel from wells about 100 feet below the river bed and provides that water to retail water suppliers, including Santa Rosa, throughout Sonoma County and North Marin. 

Lake Sonoma and Lake Mendocino Storage

Sonoma Water is the local cost-sharing partner for Lake Mendocino and Lake Sonoma, and determines the amount of water to be released from each reservoir when the lake levels are in the water supply pools. The U.S. Army Corps of Engineers determines the amount of water to be released when the lake levels are above the water supply pools and in the flood control pools.

Current Water Storage Levels
To view Water Supply Levels in Lake Sonoma, Lake Mendocino, as well as Rainfall, Weather, and Streamflow Data CLICK HERE

From Source to Tap

A majority of Santa Rosa's drinking water is purchased from Sonoma Water. The remainder of Santa Rosa's water supply is from groundwater wells. Santa Rosa Water a owns and operates two groundwater production wells to supplement water received from the Water Agency.

On average, Santa Rosa uses 6 billion gallons of drinking water each year. This water is delivered to over 53,000 homes and businesses in Santa Rosa (91% are residential and 9% are commercial).

To ensure adequate water supplies are available for current and future water demands under varying water supply conditions, Santa Rosa Water has an aggressive water conservation program and provides recycled water for urban and agricultural irrigation to reduce demands on our precious drinking water.

To learn more about Santa Rosa's water supply select the links below.

Woman drinking a glass of water.

Water Quality

We continually monitor and test our water throughout the distribution system to ensure fresh, safe and clean water is delivered to your tap. Our water consistently meets or exceeds state and federal drinking water standards.

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River with dense trees on both sides.

Water Supply Planning

Santa Rosa is committed to long-term water supply planning to ensure adequate water supplies are available to meet current and future water demands under varying water supply conditions.

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Map of Santa Rosa groundwater.


Santa Rosa is located within the Santa Rosa Plain sub-basin of the Santa Rosa Valley Groundwater Basin. The Santa Rosa Valley Groundwater Basin is one of the largest groundwater basins in the North Coast Hydrologic Region.

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A field being watered by sprinklers.

Recycled Water

Recycled water is wastewater that is highly treated to meet State standards and is reused for urban and agricultural irrigation, as well as sent to Calpine, via the Geysers Pipeline, to recharge the steamfields and produce clean energy.

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Water Meter

Water-Use Efficiency

Residents and Businesses throughout Santa Rosa are saving approximately 1,500,000,000 gallons of water annually through WaterSmart changes. Learn how you can be WaterSmart with our saving tips, tools, and rebates.

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