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Season 3 of upper reach cleanup construction begins this October
LDWG is preparing to begin the third season of construction in the upper reach of the waterway to remove contaminated sediment. To protect certain fish species, in-water construction will occur October 2026 through February 2027. Starting as soon as October 1, the construction contractor, Pacific Pile and Marine, will begin dredging contaminated sediment near parks and homes in South Park. Stay up to date on upper reach cleanup progress by visiting our Construction News webpage!
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 about the Consent Decree.
Middle Reach Community Impacts Mitigation Plan Outreach Summary
In March 2026, LDWG asked the community for feedback about future middle reach cleanup construction. We will use this feedback to help develop strategies to reduce construction impacts on the community. Read the Middle Reach Outreach Summary here.
What We’ve Accomplished
LDWG has completed multiple studies to help us better understand the contamination and ways to clean it up. Read about the completed studies.
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. You can learn about the Early Action Areas on our What we Accomplished page.
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.