As early as June 2026, crews will begin the second phase of the M Street Trunk Rehabilitation Project in Auburn.  

We will reline about 1.9 miles of pipe. Relining the pipe protects against it breaking or leaking. Relining also saves money by avoiding having to replace the entire pipe. Crews will work between the intersection of 2nd Street Northeast and Pike Street Northeast and 23rd Street Northeast, near the Auburn Municipal Airport (Zones 30 and 36 on the map). See the maps below for more details. 

You will be able to use your sinks, toilets, and showers normally. We will use a temporary pipe to keep sewer services working during construction. A temporary pump will lift sewage into the temporary pipe so the underground pipe can be repaired. Crews will maintain driveway access while the temporary pipe is in place. After we repair the existing pipe, we will remove the temporary pipe and pumps. Crews will restore impacted driveways, streets, and sidewalks. In some locations, crews will upgrade nearby curb ramps.

We expect to finish the pipe repair work and remove the temporary diversion pump and pipe by the end of 2026. Once this work is complete, we will begin restoring driveways, streets, and sidewalks. Restoration work is expected to finish in June 2027.

• Construction will begin as early as May. Work will generally occur on weekdays from 7 a.m. to 5 p.m. on most streets. We will notify you when weekend or night work is scheduled. 

• You will be able to use your sinks, toilets, and showers normally. 

• Crews will maintain driveway access. 

• Expect traffic detours, equipment, and lane and sidewalk closures. 

• Pumps for temporary diversion pipes will run continuously while in place. 

• Noise from the temporary pumps and other construction activities. 

• Street parking restrictions along temporary sewer diversion pipe and repair work areas. 

Please watch for equipment and signs in the area, travel slowly, and follow directions from flaggers in the work zone.   

The King County Wastewater Treatment Division is repairing the M Street Trunk sewer pipe to maintain safe and reliable service in Auburn. This pipe carries untreated wastewater (water from sinks, toilets, and drains) out of your neighborhood. It flows through a pipe system to the South Treatment Plant in Renton, where we clean and safely release it into Puget Sound.  

This project will repair approximately 2.6 miles of old concrete sewer pipe. Crews will also repair 45 maintenance holes and over 100 sewer connections to homes and businesses. Sewer services will continue working throughout the project. In phase one of the project, we repaired 0.7 miles of pipe. 

The project is separated into four work areas based on the sewer pipe size. These are Zones 18, 24, 30, and 36. We finished construction on Zones 18, 24, and a small section of Zone 30 in 2025. In 2026, we will work on Zones 30 and 36. For more details on the impacts in each area, please see the 2026 construction map below.