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Environmental Coalition of South Seattle

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ECOSS is a nonprofit organization that encourages urban redevelopment and a healthy environment by providing education, resources and technical assistance to diverse businesses and communities in the Puget Sound region.




ECOSS was established in 1994 to address challenges over the imbalance of the South Park neighborhood and lower Duwamish River. By bridging the interests of residents, industry, and government, the organization has created a model that is both sustainable and mutually beneficial. Over the years our work has expanded in range and scope as other communities have recognized the benefits of this holistic approach.

By offering free and confidential services, ECOSS has developed a niche within the Puget Sound area as a trusted source of environmental education and a link to sustainable resources. Our suite of services includes:

  • Phase I Assessments of Contaminated Properties
  • Stormwater Pollution Prevention and Education
  • Energy and Water Conservation Assistance



Seattle Office

8201 10th Ave S, #3

Seattle, WA  98108

Phone:  (206) 767-0432

Fax:  (206) 767-0203

Email: info(at)