skip to main content

Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Green Grants


Duwamish River Basin Grant Area

Grant funding is available for air and water quality improvement projects, environmental education, and community outreach efforts in the Lower Duwamish Valley. King County Wastewater Treatment Division is eager to assist community groups, schools, cities, businesses and non-profit organizations fund projects and activities that help the environment of the Duwamish watershed.

Lower Duwamish air and water quality improvement grants

These grants can fund a variety of projects that will improve air and water quality. Past projects have included roadside rain gardens, outreach to businesses on how to implement best management practices to stop stormwater pollution, an art installation that measures air quality, and wetland restoration. The funding supports projects that reduce air pollution, prevent combined sewer overflows, and prevent pollution from going into the Duwamish River. It is our hope the grants will promote partnerships and provide small-scale environmental and economic opportunities in the Duwamish..

Examples of projects that can be funded by Green Grants:

  • Projects that identify sources of air pollution or reduce air pollution in the Lower Duwamish.
  • Education and outreach campaigns about air or water pollution prevention
  • Green stormwater infrastructure projects that help stop polluted runoff from going into the Duwamish River (rain gardens, tree boxes, cisterns, permeable pavement)
  • Cooperative projects with neighborhood groups or businesses that involve the community in solutions for a better environment for the Lower Duwamish 

Learn more and apply for a grant

News releases

For more information

Related topic

Our Duwamish
The Lower Duwamish Waterway is an economic engine, cultural icon, and vital regional transportation corridor. No matter where we live in King County, no matter how we use the river, we all have a stake in protecting it -- it’s Our Duwamish. Learn more.