Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.

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: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Puget Sound shoreline next to the West Point Treatment Plant, Seattle

Roadside Raingardens

“Roadside Raingardens” capture street runoff before it reaches the sewer system.

MidBlkPhoto_300
Example of Roadside Raingarden in Portland, OR

B416MidblkCBs_600
Proposed mid-block curb extensions
(Barton CSO sub-basin 416)

View recommended proposal
Recommended proposal for Barton CSO Control Project

Learn more about Green infrastructure