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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

Upper basin, east of 35th Ave SW (Green Stormwater Infrastructure)

Upper basin, east of 35th Ave SW (green stormwater infrastructure)
Upper basin, east of 35th Ave SW (green stormwater infrastructure)

Project elements

Roadside Raingardens - learn more
Example of Roadside Raingardens in Portland, OR

  • Roadside Raingardens” located on multiple blocks to capture street runoff before it reaches the sewer system
  • No operating facilities required


  • Strong interest in green alternatives from community and regulatory agencies
  • Uses some of the existing planting strips
  • Reduces flows to existing wastewater facilities, saving energy costs
  • Working closely with Seattle Public Utilities Green Stormwater Infrastructure program
  • Many similar projects throughout the Northwest


  • First project of its type and scope for the Wastewater Treatment Division
  • Reduces parking by two spaces per block