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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 Treatment Plant

South Plant, located in Renton, is part of King County's regional wastewater treatment system. South Plant treats wastewater from homes and businesses coming from cities located east and south of Lake Washington. Approximately 90 million gallons a day (mgd) of wastewater is treated at this facility during the dry months and up to about 300 mgd flows can be treated during the rain/storm season.

NPDES permit | Septage disposal

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Contact us

24 hour emergency and odor reporting: 206-263-1760
Administration: 206-263-1810

1200 Monster Road S.W., Renton, WA 98057; Directions and map,
Septage disposal map

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