image:filtered light in the forest

Toxics Cleanup Program

Photo:  Lower Duwamish Waterway

Ecology is leading the effort to clean up sources of pollution from the land area (watershed) surrounding the Lower Duwamish Waterway (LDW) Superfund Site. See our Latest Information page to find out what’s going on right now!

The LDW Superfund Site is an approximately 5 mile portion of the Duwamish River which flows northward into Elliott Bay. The U.S. Environmental Protection Agency (EPA) added the LDW to the Superfund National Priorities List in 2001. Ecology added the site to the Washington Hazardous Sites List in 2002.

The sediments (mud) in the river contain a wide range of contaminants due to decades of industrial activity and runoff from urban areas. Contaminants in the soil and groundwater in the land area around the river can find their way into the sediments through storm runoff and other pathways.

EPA will clean up the river sediments, while Ecology is responsible for controlling sources of pollution from the surrounding land area in order to minimize re-contamination of the river. Click on the links at the left to find out more about source control.

Map of cleanup sites on the LDW.


This page last updated March 6, 2017