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Project update

January 12, 2018

Pump station and weekend HDD work continues

This weekend, crews will continue to prepare for pipe installation near the HDD staging area on SE 38th St and at the Sunset Pump Station between 7 a.m. and 7 p.m. on Saturday. On Monday, Jan. 15, crews will take the day off for Martin Luther King Jr. Day.

Please know that crews will be moving between locations as they continue to install the pipe and upgrade the pump stations.

View project update for more information.

Work area map


Learn more: view project FAQs (updated December 2017).

Boater information

Boater information: pipe staging activities on Lake Sammamish , December 6, 2017


Caution - large pipe in water. Boaters use caution in SW Lake Sammamish near Vasa Park.

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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

Construction is expected to start as early as summer 2017 and end in 2020.

1707_Sunset_Heathfield_construction-schedule_800View high-resolution version .

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