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Lake Hills and NW Lake Sammamish sewer upgrade

The Lake Hills and NW Lake Sammamish Sewer Upgrade Project will upgrade 4.5 miles of sewer pipes serving the growing Redmond and Bellevue area.

Project description

The Lake Hills and NW Lake Sammamish sewer pipe has been serving Redmond and Bellevue for 50 years, carrying wastewater to Brightwater Treatment Plant in Woodinville for treatment. King County is working on a project to upgrade 4.5 miles of this sewer pipe to meet the growing needs of the community. King County will build the new pipe in trails, roads, and parks in Redmond.

Construction on the project is expected to begin in 2024 and may impact your daily routine. When the project is complete, the new pipe will provide sewer service for 50 years or more.

Project update

June 2023

Join us for more events this summer!

We had a great time connecting with Sammamish River Trail users during Bike Everywhere Day in May. If you missed us at Bike Everywhere Day, please join us at Redmond Derby Days on Saturday, July 15, from 10 a.m. to 9 p.m. or at the Move Redmond Open Streets Festival on Saturday, August 26, from 10 a.m. to 3 p.m. Stop by our booth at either event to learn more about the project. We hope to see you there!

Two people on bicycles next to a table talking to a King County staff person about the upcoming capital project.  

King County WTD continues to work on the final design for the Lake Hills/NW Lake Sammamish Sewer Upgrade project. Construction is expected to begin in late 2024.

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 you might have as we get closer to construction. Please contact Annie Pfeifer at 206-263-3203 or for more information.

Sign up for project text alerts

Be sure to sign up for project updates to stay up-to-date on the latest project information and upcoming events. You can also get updates from your phone. To sign up for text alerts, text KING REDMONDSEWER to 468-311.

Previous project updates

Project location