Skip to main content
Many King County facilities are closed to the public. Learn how to access services remotely or while practicing social distancing guidelines.  
King County logo

The Vashon plant is a secondary treatment facility that uses an oxidation ditch process.

Vashon labVashon lab

View more photos on our Flickr site  .

Contact us

24 hour emergency and odor reporting:   206-263-1760
Administration:  206-463-7318 

Address
9615 S.W. 171st St.
Vashon, WA 98070

Directions and map