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Wastewater Treatment Division (WTD) operations and projects

WTD operations staff remain on the job 24/7 to ensure the region’s wastewater treatment service continues. More information on how to report a problem you believe may be related to the County’s wastewater treatment system is available here:

The King County Wastewater Treatment Division remains committed to sharing information and gathering feedback from community members about its work and projects. WTD staff remain available to answer questions via email and phone during regular business hours. Project information lines remain available and are being monitored for ongoing construction projects.

Project update

May 18, 2020

Construction in Auburn completed, road reopened

King County crews completed work to repair a sewer pipe on M Street NE in Auburn on May 15 and is completing restoration this week.

Project description

To protect public health and the environment, the King County Wastewater Treatment Division has repaired a section of pipe at the intersection of M Street NE and 2nd Street NE in Auburn. This pipe, called the M Street Trunk, was built around the 1950s and a section that was corroded by the hydrogen sulfide produced from wastewater was repaired. 

Wastewater from south King County is collected by local cities and sewer districts and flows to the county’s South Treatment Plant in Renton.

What to expect

Construction to repair the pipe required an open cut in the road that temporarily closed the intersection of M Street NE and 2nd Street NE. Sewage diversion pipes were temporarily installed above ground to allow flows to bypass the section of pipe being repaired and reenter the sewer system at a maintenance hole on 2nd Street NE between M Street and N Street.

Detour and local access only

Map of detour on Auburn WayMap of detour on Auburn Way

  • Traffic to be diverted to an alternate route on AUBURN WAY at AUBURN WAY N and 15TH ST NE and AUBURN WAY S and 17TH ST SE.

Map of local access only streets near the closed intersection.Map of local access only streets near the closed intersection.

  • Local access only on M ST NE, between EAST MAIN ST and 4TH ST NE.
  • Local access only and temporary barricades placed on the following streets near the project: F ST NE, H ST NE, J ST NE, K ST NE, L ST NE, N ST NE, O ST NE, PIKE ST NE, 2ND ST NE, 3RD ST NE, 4TH ST NE, 5TH ST NE.

How to stay updated

We will continue to provide updates on this project webpage. For additional information, contact Eunice Lee at


Contact us

Contact Eunice Lee community services lead at:

Project location

project location mapM Street NE and 2nd Street NE, Auburn

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