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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&nbsp is investesting $3.3 million to continue its work with EPA and the state Department of Ecology on Superfund cleanup strategy.

Conveyance System Improvements 

In 2013, the utility will spend $6.1 million to carry out activities that guide the planning, design, and construction of new pipeline improvements and expansions within the utility’s 420-square-mile service area.