Skip to main content


King County has been working to clean up the Lower Duwamish for decades. But our efforts to remove historic contamination are only the start.

Lower Duwamish Waterway Superfund Cleanup

The Lower Duwamish Superfund cleanup will enhance the health of the Lower Duwamish Waterway for tribes and community members, support a more thriving economy, and provide a healthier habitat for fish and wildlife. 

East Waterway Cleanup

East Waterway is part of the Harbor Island Superfund Site and is regulated by the U.S. Environmental Protection Agency (EPA).

King County's efforts to keep pollution out of the water

Keeping pollution out of the Lower Duwamish has been a regional priority since the 1950s.

King County in the Duwamish Watershed – more than cleanup

The King County government is a major property owner and a service provider in the Lower Duwamish area. We manage transit service, wastewater facilities, trails, health services, roads and bridges, and even an international airport. Our agencies are dedicated to enhancing the quality of life and protecting public health and the environment. We are proud to be both part of the community and a representative to the people who live and work there.

How you can help the Duwamish

Cleanups and wastewater controls alone are not enough to protect the Duwamish in the future – we all have a responsibility to do our part to prevent harmful chemicals from getting into our waterways.