Skip to main content
Many King County facilities are closed to the public. Learn how to access services remotely or while practicing social distancing guidelines.  
King County logo

Wastewater Treatment Division (WTD) operations and projects

WTD operations staff remain on the job 24/7 to ensure the region’s wastewater treatment service continues. More information on how to report a problem you believe may be related to the County’s wastewater treatment system is available here:

The King County Wastewater Treatment Division remains committed to sharing information and gathering feedback from community members about its work and projects. WTD staff remain available to answer questions via email and phone during regular business hours. Project information lines remain available and are being monitored for ongoing construction projects.

Project update

Spring 2020

King County to upgrade regional sewer pipe in Interbay neighborhood

King County is planning to upgrade an aging sewer pipe in Seattle’s Interbay neighborhood that is nearing the end of its service life. Learn more about this project here .

Construction for the project is expected to begin in early 2021. Whether you work, live or recreate in the area, we know you’ll have questions or concerns. As the project gets underway, we’d like to get to know you better. We are in the process of reaching out to neighbors and organizations in the project area.

Interested in scheduling an individual meeting or briefing to learn more about the project? Contact Dana West at

Sign up for project alerts

Be sure to sign up for project updates to stay up-to-date on the latest project information and upcoming events. To sign up for text alerts, text KING INTERBAY to 468-311.

Project description

King County plans to upgrade an aging sewer pipe in Seattle’s Interbay neighborhood. The existing pipe was built in 1967 and is nearing the end of its service life. New odor control technology will be added to the system while the sewer pipe upgrade is underway. When complete, the sewer will provide reliable service for another 50 years or more.

map of Interbay sewer pipe to be replacedView higher resolution version .

Project schedule


planning phase

Contact us

Dana West, Community Services:

Sign up for project email or text updates (or manage your King County subscriptions).

Project location

project location mapView higher resolution version .

Back to the capital projects overview map .