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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.
Summer 2025
We're celebrating one year since completing the power quality improvement project! The first-of-its-kind battery system at West Point Treatment Plant proved effective during its first year, keeping critical pumps operating during 78 power disruptions. Learn more.
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.
Learn more
- Learn how West Point's treatment process works.
- Get the facts on the West Point's operations.
- Discover how West Point contributes to a sustainable future for the surrounding community and environment.