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West Point, located next to Discovery Park in Seattle, is part of King County’s regional wastewater treatment system.

West Point treats wastewater from homes and businesses in Seattle, Shoreline, north Lake Washington, north King County and parts of south Snohomish County. Seattle’s combined stormwater/wastewater sewer system also flows into West Point.

Approximately 90 million gallons a day of wastewater is treated at this facility during the dry months. During the rain/storm season, West Point provides secondary treatment for flows up to 300 million gallons a day (mgd) and provides primary treatment and disinfection for flows exceeding 300 mgd and up to 440 mgd.

rsz_9010824512_2b7360a282_zWest Point Treatment Plant

View more photos on our Flickr site  .

Newsletters

West Point Treatment Plant Sewer News
  • Fall 2015  2MB)
    • West Point Treatment Plant turns 50!
    • Save yourself the aggravation, don't park in the West Point's emergency turnaround areas
    • King County has asked the City of Seattle to expand the allowable access hours for biosolids trucks
    • Upgrade to water reservoirs near Loop Trail in Discovery Park
    • West Point Treatment Plant has earned another Platinum Peak Performance Award 
  • Spring 2014 (   1MB)
  • Summer 2013 (   800KB)
  • Summer 2012 (   2MB)
  • Spring 2011 (   735KB)
Storm impacts on West Point Treatment Plant

>> Updates posted on the Incident Response page.

Contact us

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

Address
1400 Discovery Park Blvd.
Seattle, WA 98199

Directions and map