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West Point Treatment Plant

Find information and facts about West Point Treatment Plant located next to Discovery Park in Seattle, including the treatment process, capital and improvement projects, and ongoing public engagement.

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

Aerial view of West Point Treatment Plant.

Located next to Discovery Park in Seattle, West Point Treatment Plant (West Point) began operating in 1966. West Point cleans more wastewater each day than any other plant in Washington. Approximately 90 million gallons of wastewater per day are treated at the facility during the dry months. Seattle’s combined stormwater/wastewater sewer system also flows into West Point. West Point serves homes and businesses in Seattle, Shoreline, north Lake Washington, north King County, and parts of south Snohomish County.

A female wastewater worker wearing a hardhat, googles and safety vest checks wastewater treatment plant process and equipment

A crew member at West Point checks plant monitoring equipment.

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