Water Source

Cedar River Watershed in WinterBellevue's drinking water is acquired through the Cascade Water Alliance, an association of water districts and cities, including Bellevue, which serves as a regional water supply agency and wholesale water provider. 

  • Cascade purchases water from Seattle and provides it to Bellevue and other members in a cost-effective and environmentally sensitive way.
  • The water comes from the protected watersheds of the Cedar and South Fork Tolt rivers in the Cascade Mountains, and meets or exceeds state and federal water quality requirements.
  • Seven municipalities and water districts in King County are members of the Cascade Water Alliance.

Cascade purchased Lake Tapps in east Pierce County in 2009, and the state issued Cascade the official water rights to develop a drinking water supply. Cascade likely won't develop Lake Tapps for decades, but it is there as a valuable resource for the region when needed. See Cascade Water Planning.

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