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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.
Updates
February 10, 2026
Roadway Update: The dip is gone!
Crews have fixed the dip in Discovery Park Boulevard and finished paving. The road is open, but workers will return for short periods this month to finish the job.
What’s next:
- Install concrete curbs and paint roadway lines
- Restore plants and soil along the sides of the road
Work will happen on a few days through February 27, between 8 am and 2 pm. When crews are working, flaggers will keep traffic moving. Sidewalks and trails will stay open. Read the full update.
Winter 2026 Newsletter: It’s raining! It’s pouring! But West Point’s not snoring
In 2025, we worked on 13 construction projects at West Point Treatment Plant to make the system safer and more reliable. These upgrades help protect against earthquakes, heavy rain, and other challenges.
Highlights include:
- New roof and control room for the raw sewage pump building
- Pipe replacements to keep water moving through the plant
- Fire safety and overflow protection projects completed
- System improvements that helped treat 2 billion gallons during recent storms
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.