Skip to main content

West Point Treatment Plant

West Point Treatment Plant

West Point, located next to Discovery Park in Seattle, is part of King County’s regional wastewater treatment system. West Point began operations in 1966.

Aerial photo of the West Point Treatment Plant looking south with City of Seattle downtown in the distance

West Point treats wastewater from homes and businesses in Seattle, Shoreline, north Lake Washington, north King County and parts of south Snohomish County. Seattle’s combined stormwater/wastewater sewer system also flows into West Point.

Approximately 90 million gallons a day of wastewater is treated at this facility during the dry months. During the rain/storm season, West Point provides secondary treatment for flows up to 300 million gallons a day (mgd) and provides primary treatment and disinfection for flows exceeding 300 mgd and up to 440 mgd.

A female wastewater worker wearing a hardhat, googles and safety vest checks wastewater treatment plant process and equipmentOur crews are on the job 24/7, 365 days a year to ensure the region’s wastewater treatment service.

Contact us

24-hour emergency and odor reporting:   206-263-3801
Administration:  206-477-9800

1400 Discovery Park Blvd.
Seattle, WA 98199

Directions and map