Wastewater services
- Funding opportunities
- WaterWorks Grant Program
- RainWise rebates
- Seattle
- Georgetown Wet Weather Treatment Station
- Interbay sewer and odor control upgrade
- Ship Canal water quality (joint project with Seattle Public Utilities)
- Thornton Creek – Basin sewer study and upgrade
- West Duwamish Wet Weather Storage Facility
- West Point Treatment Plant improvements
- South King County
- Lakeland Hills Pump Station replacement
- South Treatment Plant improvements
- Recently completed projects
- List of completed projects
- Our system
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- Facilities
- Publications
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- WTD blog
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Serving the region since 1956
In 1956, a group of local residents became concerned about the effect of rapid urban growth, especially the decline of water quality in Lake Washington and Puget Sound. Their activism and advocacy led to the formation of a wastewater treatment utility to serve the region.
Today, King County Wastewater Treatment Division provides services to 18 cities, 15 local sewer districts, the Muckleshoot Indian Tribe, and more than 1.9 million residents across a 420-square-mile area in King, Snohomish, and Pierce counties. Learn more about our history.
Contact us
206-477-5371