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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.
May 2025
Read about the latest work happening at West Point and how you can help the Wastewater Treatment Division shape the future of clean water in our latest newsletter.
Discovery Park Boulevard road work Tuesday, May 27
Expect traffic delays along Discovery Park Boulevard as crews close one lane of traffic for early repair work. 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.