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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

Infiltration and inflow control project (Skyway)

During 2012 King County will complete construction of an initial infiltration and inflow (I/I) reduction project in the Skyway drainage basin (unincorporated King County). This project will test the cost-effectiveness of I/I reduction of a scale large enough to potentially offset the need for larger conveyance or storage facilities.

Kent-Auburn conveyance system improvements project 

During 2012 King County is completing design of  two new pipelines, the Kent East Hill Diversion in Kent and the Stuck River Trunk in Auburn. These pipelines will 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. Projects include replacing outmoded control system software, replacing pumps and relining pipes and tanks.