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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

Regionwide Projects

Lower Duwamish Waterway Superfund 

King County is working with EPA and the state Department of Ecology on Superfund cleanup strategy.

Conveyance System Improvements 

The utility is engaging in activities that guide the planning, design, and construction of new pipeline improvements and expansions within the utility’s 420-square-mile service area.