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Project update

January 19, 2021

Construction expected to begin in mid-2022

King County’s final design for the Interbay sewer and odor control upgrade is nearly complete. We expect to hire a contractor early next year and start construction in mid-2022. We will be in touch in the coming months with information on what you can expect during construction.

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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.

project site map

Project Timeline for Full Project

project timeline

planning phase

Contact us

Contact Kelly Foley Kruse at:



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Project location

Interbay-Sewer-location-mapView higher resolution version.

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project fact sheetProject fact sheet