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South plant, located in Renton, is part of King County's regional wastewater treatment system.

View South Plant Projects

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.

rsz_8091952044_bc3c6ce1a3_zSouth Treatment Plant in Renton

View more photos on our Flickr site  .

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, and septage disposal map