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Project update

December 2018

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 Kelly Foley at

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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

David Freed, Community Services:

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Project location

project location mapView higher resolution version .

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