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

East King County Projects

Bellevue influent trunk improvement

The county is replacing a segment of sewer line originally constructed in 1966 that has reached capacity. Construction started in June 2011.

Kirkland Pump Station and sewer upgrade 

The county is continuing construction upgrades to this aging pump station and force main serving City of Kirkland sewer customers. The project will increase pumping capacity, replacing aging equipment, and install larger diameter pipes. Construction started in September 2011.

Sunset and Heathfield Pump Stations upgrades

In 2011, the county is continuing the initial phases of planning on a major project to replace a segment of pipeline and upgrade two aging pump stations in Bellevue’s Lake Sammamish community. The project will take about five years to complete.

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