Lower Duwamish Waterway Group

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Photo of the Lower Duwamish Waterway middle reach, looking south east. Photo shows barges, vessels, and maritime activity along the river and South Park Bridge in the distance.

Tell us what is important to you as we plan for middle reach construction!

LDWG is currently designing sediment cleanup in the middle reach. The middle reach is a 1.4-mile stretch of the waterway between Duwamish Waterway Park and about a quarter mile north of the 1st Avenue South Bridge. LDWG is gathering community feedback as we plan for future waterway cleanup construction. Community feedback will help us address potential impacts of future cleanup construction and continue to refine our community outreach. Read more and take a short survey!

Photo looking north on the waterway taken at night. Photo shows barge and dredge equipment. Dredge is pulling sediment out of the water while illuminated by light.

City of Seattle, King County, and Boeing Statement on Lower Duwamish Waterway Superfund Site Consent Decree with EPA and Ecology

The City of Seattle, King County, and Boeing are pleased to announce the signing of the proposed consent decree for the Lower Duwamish Waterway Superfund Site cleanup by the U.S. Department of Justice and U.S. Environmental Protection Agency. The members of the Lower Duwamish Waterway Group are committed to advancing the restoration of this vital waterway, which is critical to protecting its ecosystem and those who use the waterway. Read our statement here.

Photo of orange dredge equipment mounted on a barge on the waterway.

What We’re Working On

The Environmental Protection Agency (EPA) and the members of the Lower Duwamish Waterway Group (LDWG) began sediment cleanup of the Lower Duwamish Waterway Superfund site in November 2024. Visit our What We’re Working On webpage to learn more about how we got here and the current work underway.

Aerial view of the Lower Duwamish Waterway looking north. Image shows West Seattle Bridge, Harbor Island Marina, and downtown Seattle.

What We’ve Accomplished

Completed Studies LDWG has completed multiple studies to help us better understand the contamination and ways to clean it up.

Early Action Areas LDWG is already making progress in its cleanup effort. We’ve completed cleanup at our five early action sites, which has lowered PCB contamination levels in sediments by over one half.

The Lower Duwamish Waterway Group (LDWG) is a public-private partnership committed to advancing the U.S. Environmental Protection Agency (EPA)-led sediment cleanup of the Lower Duwamish Waterway in Seattle, Washington. LDWG (pronounced “Ludwig”) includes The Boeing Company, the City of Seattle, and King County. Since EPA listed the Lower Duwamish Waterway as a Superfund site in 2001, LDWG has invested nearly $200 million in waterway studies and early action cleanups. LDWG continues to advance the cleanup design and is working to implement source control actions until the cleanup is complete.