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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

West Point Treatment Plant

Treatment process

The West Point Plant is a secondary treatment facility that uses high-rate oxygen activated sludge technology.

Video | Process diagram (pdf) | Technical factsQuick factsOdor controlPermit

Process diagram and data

West Point
View more photos (external link, Flickr).

Odor control at West Point Treatment Plant

Aerial photo of West Point Treatment Plant, 1999
West Point Treatment Plant, 1999

Aerial photo of West Point Treatment Plant, 1974
West Point Treatment Plant, 1974 (note sludge lagoons on the South Beach at Discovery Park)

The look–and smell–of West Point Treatment Plant has changed a lot since the plant was first dedicated in 1966. Processes like solids settling were once carried out in sludge lagoons on the South Beach at Discovery Park. Today, treatment processes are enclosed and covered, and the area surrounding the treatment plant has been restored for public use and enjoyment.

Odor monitoring and control requirements

Although odors can be a problem in wastewater systems, King County works hard to be a good neighbor by monitoring and controlling odors at our facilities and making long-term improvements to odor control systems.

Both regulations and policies require King County Wastewater Treatment Division to monitor and control odors. West Point Treatment Plant is in compliance with odor control regulations established by Puget Sound Clean Air Agency and the City of Seattle.

24 hour emergency and odor reporting: 206-263-3840

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Contact us

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

1400 Discovery Park Blvd Seattle WA 98199
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