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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

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Kent-Auburn Conveyance System Improvements Project

Facility operations

Phase A complete: the Kent East Hill Diversion pipeline was completed summer 2014; the Stuck River Trunk was completed winter 2013

2014 Update

Phase A of the Kent Auburn Conveyance System Improvements Project was completed in 2014. Stay tuned for more information on Phase B of the project in early 2015, with upgrades planned in the cities of Auburn, Pacific and Algona.

Phase A projects:
The Kent East Hill Diversion pipeline was completed in early 2014. Sewage flow is now being diverted from the Mill Creek Interceptor to the South 277th Street Interceptor which has available capacity via the Kent East Hill pipeline.

The Stuck River Trunk was completed in December 2013. Sewage flow that once entered the M Street Trunk at 17 St. S.E. and K St. S.E. is now being diverted to the Lakeland Hills Trunk via the Stuck River Trunk pipeline.

Project area map: Kent East Hill Diversion and Stuck River Trunk
Project area map: Kent East Hill Diversion and Stuck River Trunk (PDF)

Project description

To protect public health and the environment, the King County Wastewater Treatment Division built two new pipelines, the Kent East Hill Diversion in Kent and the Stuck River Trunk in Auburn. The new pipelines provide the required capacity to accommodate recent and projected growth in Kent and Auburn and allow King County to continue to provide safe, reliable sewer service.

Providing additional sewer capacity protects public health by reducing the chance of sewer overflows into homes and streets. The new pipelines provide sufficient capacity to meet Kent and Auburn’s needs through 2050.

Click below for more information on:

Project schedule

 Project schedule for Kent-Auburn Conveyance System Improvements
2008 Alignment alternative selection and predesign
2008-2009 Environmental review
2008-2009 Design and permitting
2009 Project delayed due to budget constraints
2012 Complete final design
2013 Community meeting, begin construction
2014 Complete construction and street restoration

Being a good neighbor

King County is committed to being a good neighbor and will work directly with the community throughout the project to minimize construction impacts whenever possible. Residents can expect:

  • Advance notice of construction activities – mail, email, phone, door hangers
  • Community meetings prior to start of construction
  • One-on-one problem solving with residents directly impacted by construction activities
  • Project website and construction updates
  • 24-hour project construction hotline

More information