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Heathfield Force Main Rehabilitation

The Heathfield Pump Station has two pressurized sewer pipes. These pipes help move sewage to South Treatment Plant in Renton via the Eastgate Trunk. Since August 2024, the older of the two pipes has been out of service. This project aims to rehabilitate the older pipe, built in 1983, and bring it back into service.

Project background

In August 2024, King County wastewater operators were doing regular maintenance at the Heathfield Pump Station. During that work, the older of the two pressurized pipes broke near the station.

King County quickly fixed 100 feet of the broken pipe. Since then, the pipe has remained out of service while King County further investigated it’s condition. The newer pipe, built in 2022, has been able to move sewage to the regional treatment plant to be cleaned and safely released into Puget Sound.

This project aims to rehabilitate the rest of the older sewer pipe so we can return it to service. Once operational, it will help carry higher levels of flows that come to the pump station during winter storms.

Project update

September 2025

King County finished our assessment of the pipe that broke in August 2024. We found that the pipe needs additional repairs to about 100 feet of the pipe located near SE 35th PL. These repairs are important to finish before the rainy season starts.

Construction is expected to start as early as September 15, 2025. Work is expected to take 6-10 weeks to complete.

Aerial Map of the Heathfield force main located in Bellevue between King County’s Heathfield Pump Station and East Gate Trunk.Construction will take place next to the eastbound travel lane on SE 35th PL.

During construction, you can expect:

  • Approved work hours are from 7 a.m. to 3 p.m. on weekdays
  • Increased noise and vibration, typical of a construction site
  • Crews plan to work along the right-of-way on SE 35th PL
  • Crews will close the eastbound travel lane to provide a safe work area
  • Flaggers will direct alternating traffic through the open lane for drivers

We appreciate the patience of neighbors near the Heathfield Pump Station while we bring the pipe back into service.

For questions or concerns related to the Heathfield Force Main Rehabilitation, please contact Annie Plumley at HeathfieldPumpRepair@kingcounty.gov or at 206-263-4088.

Project location

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