Skip to main content
Our website is changing! Starting March 31, 2023 our website will look different, but we're working hard to make sure you can still find what you need.  
King County logo

Constructed in 1966, West Point treats wastewater for about 670,000 people in the Seattle and Shoreline areas.

Prior to the construction of West Point, Seattle’s raw sewage flowed directly into the Puget Sound.

West Point historical timeline of the site

West Point TimelineWest Point timeline , from 3,000 BC to the present.

Secondary expansion

West Point was significantly expanded in the early 90’s to provide secondary treatment. Learn more: Steward of the waters, a retrospective on wastewater treatment at Seattle's West Point  , December 1995. 

Regional system history

In 1958 voters approved a plan for a regional wastewater treatment system to clean the wastewater being generated from the developing cities. Metro was formed as the organization to build and manage this system and was later merged with King County. More regional wastewater system history.

Aerial view of the plant under construction looking west, January 5, 1965Construction of West Point primary treatment and digesters 1965

View more photos on our Flickr site  .

Contact us

24-hour emergency and odor reporting:   206-263-3801
Administration:  206-477-9800

1400 Discovery Park Blvd.
Seattle, WA 98199

Directions and map