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

How can I help the Duwamish?

Cleanups and wastewater controls alone are not enough to protect the Duwamish in the future – we all have a responsibility to do our part to prevent harmful chemicals from getting into our waterways.

The Duwamish Waterway has historical sediment contamination from past development practices. Once it is contaminated, it is hard and expensive to clean up. Collectively, utility rate payers and tax payers (all of us) will need to invest millions of dollars in a plan to clean it up.

Preventing pollution takes effort but it is cheap and effective. You decide...

How can I help the Duwamish?

Your role in helping reduce the potential risks to human health posed by the Duwamish sediments
Your role in helping reduce the potential risks to human health posed by the Duwamish sediments

Keep cars maintained; fix leaks
Keep your car well-maintained

Put trash in a trash can, not the toilet
Put trash in a trash can, not the toilet

Pick up pet waste and throw in trashcan
Properly dispose of pet waste

Choose natural, simple products. Avoid fragrances, phosphorous and chemicals.
Choose natural, simple products

Reduce fertilizers and pesticides: choose natural yard care.
Yard and lawn care

Keep your car maintained Pick up pet waste and throw in trashcan Reduce fertilizers and pesticides; choose natural yard care Reduce fertilizers and pesticides; choose natural yard care Choose natural, simple products. Avoid fragrances, phosphorus and chemicals. Put trash in a trash can, not the toilet Choose natural, simple products. Avoid fragrances, phosphorus and chemicals.

Help prevent pollution