Sonoma County Water Agency

The mission of the Sonoma County Water Agency is to effectively manage the water resources in our care for the benefit of people and the environment through resource and environmental stewardship, technical innovation, and responsible fiscal management. 

Water Supply

We manage and maintain a water transmission system that provides naturally filtered Russian River water to nine cities and special districts that in turn delivers drinking water to more than 600,000 residents in portions of Sonoma and Marin counties.  You receive your drinking water and water bill from your local city or water district.

Flood Protection

Providing flood protection for our community is important. Over the years we have partnered with federal agencies to help build and manage a variety of flood protection projects, including Warm Springs Dam, Spring Lake, Coyote Valley Dam, Matanzas Creek Reservoir, Piner Creek Reservoir, Brush Creek Middle Fork Reservoir and Spring Creek Reservoir.  The Water Agency also manages a proactive stream maintenance program that maintains more than 80 miles of creeks throughout our service area.


In 1995 the Water Agency assumed responsibility from the County of Sonoma for managing the county sanitation zones and districts, which provide wastewater collection and treatment, and recycled water distribution and disposal services for approximately 22,000 residences and businesses.  The zones include Airport/Larkfield/Wikiup, Geyserville, Penngrove and Sea Ranch.  The sanitation districts include the Occidental, Russian River, Sonoma Valley, and South Park County Sanitation Districts.

Recycled Water

Recycled water is cleaned wastewater from homes and businesses. Water from sinks, toilets and indoor plumbing goes to a treatment facility. Advanced treatment processes are used to remove bacteria and pollutants. Treated wastewater undergoes extensive testing to ensure that it meets strict standards set by the California Department of Health Services.


The Water Agency is involved in a number of programs and initiatives to study the groundwater resources of the region through the Santa Rosa Plain Groundwater Program, the Sonoma Valley Groundwater Program, the Stormwater/Groundwater Recharge Program, and the Salt and Nutrient Management Plans.


Contact Sonoma County Water Agency

Grant Davis
General Manager
404 Aviation Boulevard
Santa Rosa, California  95403
Phone: 707-526-5370
Fax: 707-544-6123


Service Area

Services provided in:
  • Sonoma County, California

Related Success Stories for Sonoma County Water Agency

Salt Pond Restoration in San Francisco Bay
Restoration of 25,000 wetland acres at salt ponds around San Francisco Bay, with additional benefits from flood management, public access, and recreation.