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

Get Directions to our office location in Seattle, Washington.

The Duwamish Waterway... running towards a brighter future

Cleaning up the Lower Duwamish

All of us can help keep contamination out of the waterway

How we can restore the waterway

King County and its partners began defining a strategy to clean up the waterway’s sediments in 2000 - prior to the waterway being listed as a Superfund site. Together with regulators and the community, King County is continuing work to reduce risks to fish, wildlife and people who use the Lower Duwamish for recreation and net fishing.

 

News and updates

Keep cars maintained; fix leaks
What can I do to help the Duwamish?