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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
Fall 2026
Join us at Magnolia Farmers Market on September 26 from 10 am to 2 pm.
The West Point team has been attending multiple events this year, making sure we keep the community informed about everything we have going on. Earlier this year, we attended a pop-up at Discovery Park Beach, the United Indians of All Tribes Seafair Indian Days Powwow, and Ballard Locks Salmon Day. Find summaries of past events on our public engagement page.
Sign up for our email list to stay up to date on future events!
Are you a part of an organization looking to learn more about West Point and how King County treats your wastewater? Contact the West Point outreach team to see how we can help:
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.