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About Us

The Seattle Water Supply System Operating Board represents 17 municipalities, water districts, and the City of Seattle, who partner together to meet State and Federal regulations and bring high quality drinking water to its customers. These 17 municipalities and water districts are known as wholesale customers that have signed full or partial water supply contracts with the City of Seattle until 2061.

The participants of the Seattle Water Supply Operating Board supply water to more than 1.4 million customers in the greater Seattle metropolitan region of King County, including Cascade Water Alliance, and a small portion of Snohomish County. Operating Board participants also work together to use water wisely through the Saving Water Partnership for current and future generations. 

The Water Supply Operating Board By-Laws can be viewed here. View By-Laws (pdf)