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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

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Staff Contacts

Kent-Auburn Conveyance System Improvements Project (Phase B)

Learn more about project design

October 2015 Update

On October 28, 2015, the King County Wastewater Treatment Division (WTD) issued a Determination of Nonsignificance (DNS) for the Kent/Auburn Conveyance System Improvements Project (Phase B). The DNS and environmental checklist can be reviewed HERE. Comments must be submitted by November 16, 2015.

Phase A of the Kent Auburn Conveyance System Improvements Project was completed in 2014. You can learn more about this work here.

Project description

Project area for Kent Auburn Phase B
Project area

Sewer pipeline work in Pacific, Algona and Auburn

The Kent-Auburn Conveyance System Improvements Project will expand the capacity of King County’s wastewater conveyance system in the southern service area. The project is divided into two phases; Phase A work was completed in 2014 

  • Phase B will include new sewer lines, a replacement sewer line in Pacific, Algona and Auburn, and modifications to the Pacific Pump Station discharge piping in Pacific.

Construction is expected to begin in late 2016 and last for two years. The proposed sewer line alignment for Phase B includes:

  • City of Pacific: along Frontage Road North/Seattle Boulevard North from the Pacific Pump Station to 5th Avenue South.
  • City of Algona: along Seattle Boulevard South from 5th Avenue South to 1st Avenue North and along private properties adjacent to the railroad and Interurban Trail; along the eastern edge of the Puget Sound Energy corridor; across the Union Pacific Railway corridor.
  • City of Auburn: along Perimeter Road to 15th Street Southwest; along private properties parallel to the railroad and Interurban Trail to West Main Street and the then one block west to the corner of West Main Street and Clay Street Northwest, where this section of the pipeline ends.

As more details of the project design are known, including the alignment and construction methods, the County will provide more information on this web site and share this with the community.

Project schedule

Mid 2016: Project design complete
Late 2016: Begin construction
Late 2018: Complete construction

Being a good neighbor

King County is committed to working with the community throughout the project to minimize construction impacts whenever possible. Residents can expect:

  • Advance notice of construction activities by mail, email, phone, notices
  • One-on-one problem solving with residents directly impacted by construction activities
  • Project website to provide information and construction updates
  • Project information line available during construction

More information

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