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

Get Directions to our office location in Seattle, Washington.

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

Wastewater Treatment Division

King County, Washington, protects water quality and prevents water pollution by providing wastewater treatment to 17 cities and 17 local sewer utilities. The county's Wastewater Treatment Division serves about 1.5 million people, including most urban areas of King County and parts of south Snohomish County and northeast Pierce County. More about our system and facilities.

Spotlight

Wastewater Treatment Division offices will be closed on Friday, July 3 to observe Independence Day and Monday, July 6 for the King County furlough.

West Point Aerial Image
News release, June 22, 2009 -- New safeguards added to West Point permit (external link). Learn more about King County Wastewater (NPDES) Permits Discharges from municipal wastewater facilities.

Upcoming Treatment Plant community tours
> Wed. July 15 at South Treatment Plant, Renton, 5-7 p.m.
> Sat., July 18 at West Point Treatment Plant, Seattle, 10 a.m. - 12 Noon
Register here.

SEWER: The Flow of Intelligence,
A carefully designed monitoring program helps King County, Wash., keep a close eye on system performance and understand future needs, May 2009, Municipal Sewer & Water E-Zine

The county's wholesale monthly sewer rate will remain at $31.90 for 2009-2010. Effective Jan. 1, 2010, the monthly capacity charge for new connections will increase from $47.64 to $49.07. View June 16, 2009 news release.

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