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image:filtered light in the forest

Toxics Cleanup Program

Lower Duwamish Waterway

Source Control Areas (map)

The land area around the Lower Duwamish Waterway (LDWW) is divided into 24 sub-basins (or source control areas) based on the pathways that storm runoff can take as it drains into the waterway.
Ecology worked with other members of the Source Control Workgroup to develop a Source Control Area Plan (SCAP) for each of the 24 source control areas.  The Combined Sewer Overflow (CSO) Basins are being addressed under King County’s and City of Seattle’s CSO Control Plans.  
The SCAP for each source control area identifies potential contaminant sources and transport pathways that may affect sediments. The plan evaluates the significance of these sources and their potential for recontamination of sediments, and identifies actions needed to control them. It also describes sampling and monitoring that will be conducted to identify any additional sources.
Click on the map key to view the SCAP for each source control area. 

Spokane Street to Ash Grove Duwamish Diagonal Way Lower Duwamish Waterway Source Control Area Map

This page last updated January 12, 2017