Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.
For questions about the Duwamish Waterway Programs, please contact Doug Marsano. 

Wastewater Treatment Division
King Street Center
201 S. Jackson St., Suite 505
Seattle, WA 98104-3855

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The Duwamish Waterway... running towards a brighter future

King County's Duwamish Waterway Programs

To protect public health and the environment, King County’s Wastewater Treatment Division and its predecessor Metro have worked for more than 40 years to restore the Lower Duwamish Waterway. King County is now involved in the Lower Duwamish Waterway's Superfund Cleanup. Visit the area of interest to you to learn more about the cleanup and King County's work over the past 40 years to restore the Lower Duwamish to health.

Major milestones, approaches and participantsThe Superfund Process
Major milestones, approaches and participants

Working together to restore the waterway Cleaning Up the Duwamish 
How we can restore the waterway

All of us can help keep contamination out of the waterwayPreventing Pollution
All of us can help keep contamination out of the waterway

King County’s long-standing commitment to the DuwamishInteractive timeline:
King County’s long-standing commitment to the Duwamish

News and updates