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

King County at work preventing pollution in the Lower Duwamish Waterway

All of us can help keep contamination out of the waterway

All of us can help keep contamination out of the waterway
Source control in Lower Duwamish cleanup. May 2011
Source control in Lower Duwamish cleanup. Keeping pollution out of the Lower Duwamish has been a regional priority for nearly 50 years (PDF), May 2011