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East Waterway​

EWW.gifThe East Waterway is maintained as a navigation channel and is used for Seattle’s main shipping and cargo transport terminus. Since 2006, the Port of Seattle has been working on the environmental cleanup of the East Waterway Superfund Sites. The Port has partnered with the City of Seattle (City) and King County (County) to form the East Waterway Group to conduct these efforts.
The Port is  working under a voluntary agreement with the U.S. Environmental Protection Agency (EPA) to conduct a investigation to assess the risks from contaminated sediments in the 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.
To date, the Port has invested over $5 million dollars for this effort. Several technical reports have been prepared to provide detailed project approaches and results for various components of the site investigation and risk assessments. The Port’s goal is to protect human health and the environment while making sure the waterway remains a  working waterway vital to our region’s economy.

East Waterway Remedial Investigation Summary 

Objective: A study of the extent of contamination in the waterway and the risks to humans.

Conducted by: East Waterway Group - a partnership between City of Seattle, King County and the Port of Seattle.

Oversight: U.S. Environmental Protection Agency and Washington Department of Ecology.

This report provides the results of a multi-year investigation into the waterway's health. The investigation includes extensive studies on containment concentrations in the 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 are used in the development of remedial alternatives. Those alternatives will be presented in the Feasability Study which is under development and due to be published in 2013.


For more information

EPA website

Technical Documents 
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