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Duwamish Cleanup

The Lower Duwamish Waterway plays many essential roles, supporting commerce and employment, meeting commercial and tribal fishing needs, and providing for critical estuarine environments for salmon and wildlife. The Duwamish industrial area is a crucial jobs base for the region, employing more than 80,000 people. The Lower Duwamish Waterway plays an essential role in supporting commercial navigation, employment, and commerce that invigorates our economy.
Since 2000, the Port of Seattle has been a partner of the Lower Duwamish Waterway Group in working on the environmental cleanup of the Lower Duwamish Waterway Superfund Site. The partners include: City of Seattle, King County, and the Boeing Company.
The partners are working under a voluntary agreement with the U.S. Environmental Protection Agency (EPA) and the Washington State Department of Ecology (Ecology) to conduct a coordinated investigation to assess the risks from contaminated sediments in the Lower Duwamish Waterway, to summarize what is known about the sources of chemical contaminants, and to derive solutions to reduce exposure to these chemicals to meet remedial action objectives.
LDWG’s goals are to protect public health, improve water quality, and restore vital areas of the river environment while making sure the Lower Duwamish Waterway remains a vibrant urban working waterway. To date, LDWG partners have invested over $40 million dollars for this effort.
Currently, planning for cleanup of the overall river is proceeding in parallel with the early actions, including the cleanup of Terminal 117. EPA has just released the Proposed Plan for the site and the plan is out for public comment. When decisions are made on how to clean up the LDW, the agencies will issue a Record of Decision to direct cleanup actions and long-term monitoring.
In addition to the cleanup, the port and its partners are planning for additional future habitat restoration, the Port Commission approved the Lower Duwamish Habitat Restoration Plan

Lower Duwamish River Remedial Investigation / Feasibility Study

Objective: A study of the extent of contamination in the river and the risks to humans
Conducted by:  Lower Duwamish Waterway Group - a partnership between City of Seattle, King County, the Port of Seattle, and the Boeing Company
Oversight: U.S. Environmental Protection Agency and Washington State Department of Ecology.
This report provides the results of a nine-year investigation into the waterway' health. The investigation includes extensive studies on contaminant concentrations in sediments, water, fish and shellfish, and sediment movement. It also estimates the risk to humans and wildlife from the contaminants. 
Data collected in the Remedial Investigation were used in the development of remedial alternatives. The Feasibility Study was finalized in 2012.

40 acres in 25 years 

In addition to cleaning up pollution, the port has committed to restore, create, and enhance 40 additional acres of habitat in the Green/Duwamish watershed and Elliott Bay.more


For more information 



Terminal 117 

Further information on the Terminal 117 cleanupmore