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Completed – Summer 2019

Phase A of the Kent-Auburn Conveyance System Improvements Project was completed Fall 2014.

Project description

Since 2008, King County Wastewater Treatment Division has been working to improve the wastewater system in southeast King County. In 2014, the County completed two new pipelines in Kent and Auburn (See Phase A info here).

The second phase of the project involved building 14,000 feet of new sewer line in Pacific, Algona, and Auburn, and making upgrades to the Pacific Pump Station.

Project area

Project schedule

  • Spring 2017: construction begins
  • Fall 2018: pipe installation complete
  • Summer 2019: Pacific Pump Station work complete
  • Summer 2019: all restoration work complete


24-hour emergency and odor reporting:

Contact South Treatment Plant at  206-263-1760.

Project meetings and resources

Visit Software Help if you have trouble viewing or downloading documents.

force main (green) and dewatering line (white)A crew member inspects a dewatering pipe. This pipe removed groundwater during construction to allow crews to successfully install the green force main pipe underground.

trench in streetCrews dug a trench to install pipe underneath Frontage Road in Pacific.

installing pipeCrews used trench boxes to hold back soil while installing pipe alongside Perimeter Road in Auburn.

January 21, 2017
10:30 am to 12:30 pm at Algona City Hall,
402 Warde St., Algona

Project Open House. Please join us to learn more about the work taking place in Algona:

  • Where and when will the work take place?
  • What will it involve?
  • How can you keep informed about the project?

An open house format with staff there to answer your questions about the project. Stop by any time during the open house – stay for as long as you like!