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Eastside Interceptor Section 8 rehabilitation
The Eastside Interceptor Section 8 Rehabilitation Project will repair 4,800 feet of a 90- to 96-inch wastewater pipeline in Bellevue that is nearing the end of its useful life.
Project description
The Eastside Interceptor (ESI), which consists of 14 pipe sections, is a large and critical component of King County’s wastewater conveyance system. The ESI collects and conveys untreated wastewater from homes, businesses, and schools between Kirkland and Renton and sends it to South Treatment Plant to be cleaned and released into Puget Sound.
This project will repair ESI Section 8 (ESI 8), a 1-mile underground pipeline going from the I-90 and I-405 interchange in Bellevue to the intersection of Coal Creek Parkway Southeast and I-405. Completing repairs now will help extend the life of this vital section of the wastewater pipeline for another 50 years, ensuring reliable wastewater services for thousands of homes, businesses, and organizations in the region.
Project update
SEPA public comment period is now open through April 21
King County has issued a Determination of Nonsignificance (DNS) for the ESI 8 Project. An environmental checklist under the State Environmental Policy Act (SEPA) was completed, examining potential impacts on both natural and built environments, such as noise, water, wildlife, and transportation. King County concluded that the project will not have significant adverse environmental effects and issued the DNS as part of this process.
Public comments on the DNS and environmental checklist are open until 5 p.m. April 21, 2025. Information for how to comment and additional project documents can be found here.
Design phase update
The project team is working toward the 60% design milestone. During this phase, the project team will:
- Continue design of the preferred pipe rehabilitation option.
- Continue coordinating with project partners and working on permit applications.
- Starting as early as June, fieldwork activities will resume at several locations throughout the project area. Testing and inspections of existing infrastructure will take place on King County property and public right-of-way with the necessary permits.
- Inform community members about the project and upcoming survey work.
Construction is expected to start in 2026. This spring and summer, project team members will be attending local fairs, festivals, and community events to share updates about the project. Stay tuned for more announcements on how you can connect with the ESI 8 team!
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