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Wastewater Treatment

King County, Washington

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

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

South King County Projects

Kent-Auburn conveyance system improvements project 

King County constructed two new pipelines, the Kent East Hill Diversion in Kent and the Stuck River Trunk in Auburn. These pipelines provide required capacity to accommodate recent and projected growth in Kent and Auburn.

South Treatment Plant improvements

King County has a number of projects at the South Treatment Plant in Renton to improve system reliability, increase efficiency and ensure continued compliance with permits.