Vashon Treatment Plant
The Vashon Treatment Plant, located on Vashon Island, is part of King County's regional wastewater treatment system.
It treats wastewater from homes and businesses within the Vashon Sewer District. Approximately 180,000 gallons a day of wastewater is treated at this facility. A maximum of 1.4 million gallons per day can be treated during the rain/storm season.
January Update: Vashon pump stations Construction update
Construction at the Vashon Bunker Trail (BT) Pump Stations continues. King County crews are working diligently to complete the work on time. Substantial completion is expected in May, 2018.
Work began in September of 2017 to replace aging equipment and structures at the pump stations. Since then, contractors have made significant progress and construction is expected to be completed on schedule.
See flier for more information.
Other construction activities
- Dewatering equipment installation starting November 13, 2017 , November, 2017
- Vashon pump stations temporary sewer discharge to manhole at the end of 96th place SW, November 29, 2017
For more information contact: Bibiana Ocheke-Ameh at 206-477-5604 or firstname.lastname@example.org
- Construction update: Vashon Drip Field Replacement begins in June, May 2017.
Vashon Treatment Plant site—after construction
View more photos on our Flickr site .
24 hour emergency and odor reporting: 206-263-1760
9615 S.W. 171st St.
Vashon, WA 98070
View NPDES permit
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