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Eastside Interceptor Section 8 rehabilitation
King County is exploring repair options for the Eastside Interceptor Section 8 wastewater pipeline in Bellevue.
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.
King County is exploring options for completing repairs to 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.
Project update
July 2025
Project paused, King County exploring new repair options
King County Wastewater Treatment Division is committed to protecting public health and the environment and being responsible stewards of public resources.
After thoughtful consideration, we have decided to defer much of the current scope of the Eastside Interceptor Section 8 Rehabilitation Project in Bellevue. Further review of the pipe’s condition indicates that a significant portion of the re-lining work is deferrable. This opens the possibility of concentrating our efforts on a smaller segment of the pipe that currently shows more advanced degradation. We are exploring a rescoping of the project to reflect this shift in priorities and may reallocate any uncommitted funds to address other urgent infrastructure needs within our regional wastewater system.
Fortunately, the project’s Progressive Design-Build delivery method offers flexibility in situations like this. Because our designer and construction contractor have partnered with us from the start, they will help us further evaluate options in the coming weeks to rescope the project in line with current needs and available funding.
We want to express our sincere gratitude to the project team, our contracting partners, and everyone supporting this effort as we develop a solution that’s best for our region and our ratepayers.
Stay tuned for more updates!
We will provide more information about the project’s new schedule, design, and potential impacts after the rescoping evaluation is completed. You may see fieldwork happening over the next few months as part of this evaluation process. We will notify nearby residents and businesses who may be impacted by these activities in advance.
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