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Completed – Fall 2014

Phase B of the Kent-Auburn Conveyance System Improvements Project was completed Summer 2019.

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. To view past project updates, news releases, and environmental documents visit the project library.

Wastewater from south King County is collected by local cities and sewer districts, including the cities of Kent, Auburn, Algona, and Pacific. King County collects sewage from these local jurisdictions and conveys it to the county’s South Treatment Plant in Renton.

Kent East Hill Diversion

In Kent, King County built a new 20-inch-diameter sewer adjacent to the Kent Phoenix Academy and along Southeast 264th Street between the Academy and 114th Avenue Southeast to accommodate growth in Kent and neighboring communities. 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.

Stuck River Trunk

In Auburn, King County built a new 27-inch-diameter sewer pipeline along 17th Street Southeast between K Street Southeast and C Street Southwest to increase capacity and accommodate growth in the area. Sewage flow that once entered the M Street Trunk at 17 Street Southeast and K Street Southeast is now being diverted to the Lakeland Hills Trunk via the Stuck River Trunk pipeline.

Project schedule

Project schedule for Kent-Auburn Conveyance System Improvements


24-hour emergency and odor reporting:

Contact South Treatment Plant at  206-263-1760.

Phase A project area map  


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