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Project update

June 27, 2017

Construction begins soon! Join the project team for a pre-construction open house.

Thursday, July 20, 5:30 – 7:30 p.m.
Vasa Park Ballroom
3560 West Lake Sammamish Parkway S.E.
Bellevue, WA 98008

At the open house, you can:

  • Get the latest on initial construction schedule, planned work activities, and work hours
  • Meet the construction team, including the construction contractor
  • Learn about potential construction impacts
  • Bring the whole family to enjoy educational activities

We hope you can join us! If you can’t make it to the open house, learn about construction impacts by visiting our construction page.

For more information about past events, visit our public involvement page.


Contact us

Contact De’Sean Quinn, community services lead at:
 Feedback form

Project description

The Sunset and Heathfield Pump Stations and related sewer pipes send sewage from Sammamish, Issaquah, and Bellevue to be cleaned at King County’s treatment plant in Renton. This sewer system has provided reliable service for around 50 years and is reaching its limit.

This project will upgrade both pump stations and the connected force main pipe. The project will also upgrade the Eastgate Trunk structure near I-90. The Eastgate Trunk connects the force main pipe to a larger pipe, carrying flows to be treated at the South Treatment Plant in Renton. The improved system will help serve the growing population for many years.

Read our December 2016 newsletter for more information about how community feedback influenced final design and for details about upgrades to the pump stations

Sunset Pump Station upgrades

Sunset Pump Station Final Design

  • Four new pumps to increase capacity
  • New electrical and controls systems
  • New standby generator allowing the station to continue operating during power outages
  • New heating and air conditioning systems (HVAC)
  • Addition of native plans and restoration of shoreline habitat
  • Roof replacement and added green roof to manage stormwater
  • New lighting and fencing
  • Permeable driveway

Heathfield Pump Station upgrades

Heathfield Pump Station Final Design

  • New lighting and fencing
  • Four new pumps to increase capacity
  • New electrical and controls systems
  • New standby generator
  • New heating and air conditioning systems (HVAC)
  • Rain garden
  • Landscaping
  • Roof replacement

Project area

Project schedule

The final design for the Sunset and Heathfield Pump Stations and force main alignment is complete. Construction is expected to start as early as spring 2017 and end in 2020.

Before construction begins, the County will hold a public meeting where you can meet the construction team, learn more about the construction schedule, ask questions, and get more information about what to expect while work is underway.


Project location

Project locator map for Sunset and Heathfield pump stations and force main upgrade

Back to the capital projects overview map .

Heathfield Pump Station,
3541 163rd Ave. S.E., Bellevue

Sunset Pump Station,
3730 W. Lake Sammamish Pkwy. S.E., Bellevue