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Project update

August 2022

Major construction expected to begin in mid-2023

King County plans to begin work to upgrade one mile of aging sewer pipe in Seattle’s Interbay neighborhood in mid-2023. Previously, construction was estimated to begin in mid-2022. The County pushed construction back to allow more time for acquiring permits necessary to complete the work.

King County expects to hire a contractor as early as fall 2022. The contractor may begin preparing for construction in winter 2022. This early work will occur in and around the Interbay Pump Station. Neighbors can expect increased truck traffic and noise. Major construction, including excavation, pipe installation, and pipe relining, will not begin until mid-2023. After we hire a contractor, we will be in touch with more information on what you can expect during pre-construction and major construction. View project update for more information.

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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.

project site map

Project Timeline for Full Project

project timeline: alternative analysis, design, construction prep, construction

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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