West Point Treatment Plant

November 2011 Update: King County has completed environmental review of the West Point Influent Screenings Improvement Project in accordance with the State Environmental Policy Act (SEPA). King County has also applied to the City of Seattle for a Council Conditional Use Permit. Learn more about opportunities of public reviews and comment periods for this project. View project briefing (PDF), November 15, 2011.

The West Point Treatment Plant is located next to Discovery Park on Puget Sound.


Learn more about the history of West Point


West Point Treatment Plant service area. View larger version (PDF, 2.2MB).

Welcome to the West Point Treatment Plant, located about four miles northwest of downtown Seattle on the shores of Puget Sound.

The plant is part of King County's regional system that treats wastewater for about 1.5 million people and covers 420 square miles in the Puget Sound region. Every day, the West Point Plant cost-effectively treats wastewater and stormwater from homes, offices, schools, agencies, businesses and industries in Seattle, north King County, south Snohomish County, and some areas of Lake Washington.

Announcements

• At the county’s treatment plants, inspection, maintenance, and repair projects occur routinely. Several projects are planned for West Point Treatment Plant to improve plant efficiency and operations and insure compliance with regulations. Learn more about the following projects: 
• Alternative disinfection system
• Screenings improvement
• Waste-to-energy
• Digestion system improvements
• Office annex
• Blower replacement
• Learn how King County controls odors at West Point Treatment Plant 
• Schedule a plant tour.