South Treatment Plant
NPDES permit | Septage disposal
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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 of sewage is treated at this facility during the dry months and up to 300 millions of gallons can be treated during the rain/storm season.