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

King Street Center
201 S. Jackson St., Suite 505
Seattle, WA 98104-3855
Phone: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

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Puget Sound shoreline next to the West Point Treatment Plant, Seattle

Vashon Treatment Plant

Vashon treatment plant
Vashon Treatment Plant
9615 SW 171st St.,
Vashon, Washington

Welcome to the Vashon Treatment Plant, located at 9615 SW 171st St., on Vashon Island in Puget Sound southwest of Seattle, Washington.

The plant serves the Vashon Sewer District as part of King County's regional system that treats wastewater for about 1.4 million people in the Puget Sound region. The collection system, owned and maintained by the Vashon Sewer District, delivers sewage to the plant from about 425 residential and commercial customers in and around the island's main business area.

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