Treatment process
Vashon Treatment Plant
The Vashon plant is a secondary treatment facility that uses an oxidation ditch process.
- Treatment process diagram (updated in 2018)
- NPDES permit
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