Blue Heron flying just above still water
A Rich History...
A Cleaner Future.
Blue Heron flying just above still water
A Rich History...
A Cleaner Future.

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 Updated Community Outreach and Communications Plan Available

We are pleased to announce that our construction Community Outreach and Communications Plan (COCP) is now available. We’ve incorporated the community feedback we heard during outreach efforts in 2023 into this updated version of the COCP. You can explore the updated plan here.

Fish and Crab Sampling

What We’re Working On

The 100% Remedial Design for the upper reach portion of the Lower Duwamish Waterway is now available. The document is posted here (see Upper Reach Design AOC Amendment 4) and describes key elements for implementing the cleanup remedy for part of the Lower Duwamish Waterway (LDW) Superfund Site. Construction is anticipated to begin in the upper reach in late 2024.

LDWG Statement on the EPA’s Updated cPAH Standard

Lower Duwamish Waterway Group will voluntarily include additional cleanup actions for the areas where cPAHs are above the original remedial action level in the design for the upper and middle thirds of the waterway.

Aerial view of the Lower Duwamish Waterway

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.

Duwamish River Boat Tour

Learn More, Do More

You can support a clean Duwamish River too. Learn how you can volunteer and help keep the LDW clean.

Salmon icon

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.