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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 (Phase B) 

In 2016, King County will invest $3.1 million to expand the capacity of the wastewater conveyance system in the south portion of its service area. Construction will include installing new sewer lines and replacing aging pipes in Pacific, Algona and Auburn. Work will also include modifications to piping at the Pacific Pump Station in Pacific.

South Treatment Plant improvements

King County has a number of projects at the South Treatment Plant in Renton to replace or upgrade critical treatment plant equipment including pumps motors, and drives, which will improve system reliability, reduce maintenance costs and increase energy efficiency.