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Coal Creek sewer upgrade

The Coal Creek Sewer Upgrade Project will install new sewer pipes to carry more wastewater and meet the growing needs of Bellevue and Newcastle.

Project description

The Coal Creek Sewer Upgrade Project will upgrade a regional sewer line that serves Bellevue and Newcastle. Built between 1966 and 1991, the existing pipeline is nearing its maximum capacity and needs to be upgraded to carry more wastewater and meet the growing needs of the community.

Once installed, the new sewer pipe will serve the area for another 50 years or more.

Project update

Winter 2024

King County’s Coal Creek Sewer Upgrade project is in the final design and contractor procurement stage. During this stage, the project team is focused on finalizing permitting activities and bringing a contractor onboard. We will continue to keep community members informed and updated through email about the project’s progress. We can also attend community events and provide neighborhood briefings upon request.

Sign up for project updates.

Select the "Subscribe for project updates by email or text" button in the Stay informed box to get updates, surveys, notices, and other information by email and/or text. You can unsubscribe anytime. 

Interested in a project briefing for your community group?

We are happy to meet with you or come to your next community event to share the latest project information and to answer questions as we get closer to construction. Please contact Annie Pfeifer at 206-263-3203 or for more information.

Previous project updates

Project location