Coal Creek sewer upgrade
Wastewater Treatment Division (WTD) operations and projects
WTD operations staff remain on the job 24/7 to ensure the region’s wastewater treatment service continues. More information on how to report a problem you believe may be related to the County’s wastewater treatment system is available here: https://www.kingcounty.gov/depts/dnrp/wtd/response.aspx
The King County Wastewater Treatment Division remains committed to sharing information and gathering feedback from community members about its work and projects. WTD staff remain available to answer questions via email and phone during regular business hours. Project information lines remain available and are being monitored for ongoing construction projects.
February 5, 2021
Thank you to everyone who took the time to participate in environmental review! King County’s Coal Creek Sewer Upgrade Project is continuing design and permitting activities.
During this time, the team is continuing field work in the project area . The project team is planning site visits, surveys, and additional soil and groundwater surveys. Other types of field work may be needed. We will provide updates to area users or project neighbors if impacts are expected.
Watch for updates as we continue working on this critical clean water project!
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King County Wastewater Treatment Division (WTD) will upgrade a regional sewer line that serves Bellevue and Newcastle. The existing pipeline was built between 1966 and 1991 in an area that looked different from today, with a smaller population. The pipeline is nearing its maximum capacity and needs to be upgraded to carry more wastewater and meet the growing needs of your community.
Once installed, the new sewer pipe is designed to serve your community for another 50 years or more.
Protecting the Coal Creek Natural Area
The existing Coal Creek Trunk is approximately 2.5 miles long and primarily follows the banks of Coal Creek in the Coal Creek Natural Area between Newcastle and I-405. The new pipeline alignment will move the active pipeline away from Coal Creek offering better protection to this sensitive environmental area.
The selected pipeline alignment also aims to decrease impacts to both the Natural Area and Coal Creek Parkway SE during construction.
Contact Monica Van der Vieren at:
If you are new to the project, you can get up to speed by visiting this Story Map, which covers the project background and early design.
Back to the capital projects overview map .