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South Treatment Plant
Find information and facts about South Treatment Plant located in Renton, including the treatment process, capital and improvement projects, and visiting the facility and grounds.
December 2024
Operator-in-Training Program Application is now open! King County’s Operator-in-Training Program offers paid training and state certification for careers in wastewater treatment.
- We are accepting applications through Dec. 23. Check out this post to learn more, and to apply today!
Are you a wastewater nerd like us? Itching to learn about all the ins and outs of how South Plant operates and benefits the community? We have put together an interactive tool that allows you to do just that.
Visit the South Plant StoryMap to learn about the history of our plant, the workforce that runs it, the way the plant interacts with the community, and more!
Aerial view of South Treatment Plant in Renton.
Located in Renton, South Treatment Plant (South Plant) began operating in 1965. South Plant features a 1.5-acre demonstration farm, CitySoil, that produces more than 5,000 pounds of food for a local foodbank. South Plant is our most visited facility, hosting robust on-site educational programming for school groups and plant tours. The facility is also host to a septage disposal facility for commercial haulers. South Plant treats an average of 90 million gallons of wastewater per day from communities in Auburn, Bellevue, Issaquah, Kent, Renton, and Sammamish.
Learn more
- See how South Plant's Treatment System works.
- Get the facts on the South Treatment Plant System’s operations here.
- Learn how South Plant contributes to a sustainable future for the surrounding community and environment.
- Explore educational opportunities.