Our Customers

Water Supply Customers

Serving over 570,000 residents in Sonoma and Marin counties, the Sonoma County Water Agency is the primary provider of drinking water. The Agency's direct customers are eight cities and special districts in Sonoma and northern Marin Counties to whom we sell water, each of which help make decisions about water supply issues that affect their customers by participating in the Water Advisory Committee. Our customers are:

If your water supplier is not listed above, click here.

Water Supply Agreement of 1974

The 1974 Water Supply Agreement was instrumental in creating the infrastructure that supports our current transmission system to Santa Rosa, Petaluma, Rohnert Park, Sonoma, Cotati, the North Marin Water District, Valley of the Moon Water District, and Forestville Water District. At the end of the sixties, the Agency was faced with meeting the demands that the existing system could not accommodate. The 1974 Agreement for Water Supply allowed for the development of many projects that expanded the transmission system, thereby assuring the contracting communities of a continued water supply.

Water Supply and Transmission System Project

The Water Supply and Transmission System Project (WSTSP) will provide additional water supply and expand the existing transmission system. The WSTSP consists of three separate components which together meet the project objective of providing safe, economical, and reliable water supply to meet the future water supply needs in the Agency's service area. The three components are:

water conservation,
the increased use of the Russian River Project, and
the expansion and revised operation of the existing transmission system.

At present demands of the Agency's customers approach the delivery rates authorized in the 1974 Agreement for Water Supply and the combined diversion and re-diversion limits in the Agency's water right permits. It is imperative that the Agency obtains legal rights to use additional stored water and plan for additional transmission system facilities necessary to meet future demands. Without a plan in the future, communities served by the Agency would eventually be forced to cope with severe water shortages. The benefits of the WSTSP are:

future customer demands would be met by both implementing water conservation measures and providing additional water supply
expansion of the transmission system would improve existing and future system reliability, alleviate existing problems in the system, and enable the Agency to meet increased future delivery rates

Amendment 11

The Agreement for Water Supply and Construction of the Russian River-Cotati Intertie Project between the Sonoma County Water Agency and eight major cities and special districts in Sonoma and Marin counties was executed in 1974 and has been amended eleven times, most recently January 2000. The Eleventh Amended Agreement provides for the financing and construction of the Water Supply and Transmission System facilities required to meet the needs of the contractors.

Sanitation Customers

During a restructuring of the county government in 1995, the Agency assumed responsibility for managing the county's 11 sanitation zones and districts, which provide wastewater treatment, reclamation, and disposal for approximately 22,000 residences and businesses.