Bellevue'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 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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450 110th Ave. NE
P.O. Box 90012
Bellevue, WA 98009
Backflow Test Form
Backflow Assembly Testers List
Cedar River Watershed Virtual Tour
Tolt River Watershed Virtual Tour
Regional Water Supply Conditions
Cascade Water Alliance Video