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May
30

Interbay sewer and odor control upgrade

The Interbay Sewer and Odor Control Upgrade Project will replace aging sewer pipes in Seattle’s Interbay neighborhood and add new odor control technology.

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. Major construction is expected to begin in 2024. When complete, the sewer will provide reliable service for another 50 years or more.

Project update

March 20th, 2025

General project updates

As part of ongoing construction near the Interbay Pump Station, crews are finalizing the installation and testing of a temporary 12-inch waterline to carry fresh water. Seattle Public Utilities (SPU) is scheduled to be on-site on March 25th to tie-in the temporary line. The remaining construction work near the pump station is projected to continue through 2025. 

Check out our recent notification for more details.

Project location

View project area map on the About page.

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