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South Interceptor Rehabilitation Project
The South Interceptor Rehabilitation project will repair over 1,600 feet of deteriorated sewer pipe and seven maintenance holes in the City of Renton.
Project description
King County will repair about one-third mile of sewer pipes and seven maintenance holes serving the City of Renton. Work is expected to start in Spring 2028.
These pipes are old. Repairing them will maintain reliable service for decades. We will use temporary pipes to maintain sewer service in your area while we make repairs.
Project update
November 2026
We want to hear from you! Survey is open through January 8, 2027
We want to know what matters most to you and how we can better provide you with project information and updates from design into construction. Thank you for taking our community values survey!
Read the newsletter and take our survey!
Past project updates
- Survey and soil sampling work starting October 19, October 13, 2026
Project location
The pipe runs deep underground beneath SW Grady Way and Interstate 405. The project will occur in a commercial and industrial area in Renton with a lot of traffic. We will work with the City of Renton to keep traffic moving and limit disruptions.