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Spring 2022

Making projects sustainable, resilient, and equitable (WTD Blog)

King County’s Wastewater Treatment Division (WTD) is being recognized for its commitment to sustainable communities and the environment. WTD’s Sunset / Heathfield Pump Stations and force main upgrade project was awarded an Envision® Silver Award this month for project sustainability. This is the second Envision-certified project for the region’s wastewater utility.

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 part of the sewer system provided reliable service for around 50 years and was reaching its limit.

This project upgraded both pump stations, the connected force main pipe and 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.

Map displaying the location of the Sunset Pump Station (on short of Lake Sammamish) and Heathfield Pump Station (located west and up the hill from Sunset Pump Station) and the forcemain (pipeline) from the Sunset Pump Station to the Heathfield Pump Station)

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

  • 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 plants and restoration of shoreline habitat
  • Roof replacement and added green roof to manage stormwater
  • New lighting and fencing

Heathfield Pump Station upgrades

  • 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)
  • Landscaping
  • Roof replacement
  • New lighting and fencing

phases_graphic_construction

Contact us

Contact Caryn Sengupta, community services lead at:
 caryn.sengupta
@kingcounty.gov

206-477-2514
 Feedback form

If you’d like to receive email or text updates on the Sunset and Heathfield pump stations and force main upgrade:

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