10th Avenue West Sewer Lining Pilot Project

Aerial of 10th Avenue West facing west

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The West of Market Sewer main Rehabilitation Pilot Project will primarily involve the installation of approximately 1,335 linear feet of cured-in-place pipe (CIPP) liner for a 6-inch sewer main along 10th Avenue W, extending from 6th Street W to 4th Street W in the Market neighborhood.  Additionally, the project includes three spot repairs to address joint offsets and deficiencies in the existing sewer alignment.

This project serves as a pilot study under the broader West of Market Sewer main Rehabilitation project, which aims to utilize CIPP lining to improve the sewer main system, reduce inflow and infiltration, and extend the system’s service life. Given the risks associated with CIPP lining in 6-inch sewer mains due to potential construction and future maintenance issues, the full-scale rehabilitation effort can only proceed if this pilot project proves successful.

The West of Market Sewer main Rehabilitation project addresses structural deficiencies in this neighborhood sewer system, thereby enhancing asset longevity, reducing maintenance costs, and minimizing inflow and infiltration. The proposed CIPP alternative offers the least disruption to the residents, the shortest construction duration, and the most cost-effective solution among the alternatives evaluated.

Previous updates

(November 20, 2025) -- Work continues to line the sewer line along 10th Avenue West.  Our contractor's experienced some equipment failure, but the project continues to progress, albeit not as quickly as we expected.  


(November 6, 2025)  -- Lining is expected to have begun and may take a few days.  


(October 30, 2025) -- The lining of the 10th Avenue sewer main is expected to begin the week of November 3. 


(October 10, 2024) -- Lining of the 10th Avenue sewer main is expected to begin the week of October 20.  Residents on 10th Avenue will be requested to reduce their water usage during the day to as little as possible so that the liner can be placed and hardened.  Door hangers will be placed by the contractor on affected homes at least 48 hours prior to the work. 


(September 25, 2025) -- Work on sewer joints continues at spot locations on 10th Avenue.  The lining will occur once the repairs are complete, and notifications will be posted to the doors by the contractor of homes affected by the procedure. Limiting the creation of wastewater (limiting water usage, no dishwasher/no clothes washer, etc) will be required only by homes on 10th Avenue for a short period of time.  


(September 11, 2025) -- Work on sewer joints is expected to begin the week of September 15.  The existing sewer line was inspected and more locations will receive spot repairs in advance of the UV sewer lining.  


(September 4, 2025) -- Work is expected to begin as early as next week on spot repairs on at least three locations on 10th Avenue West.  Project Update mailing is expected to be sent next week.


(August 28, 2025) -- No update this week.


(August 14, 2025) -- The contractor will video the existing sewer line to ensure there are not blockages or offsets that need additional repair.  There are three known locations that they will have to open to repair before they can line the pipe.  Project mailer will be sent  in the coming weeks detailing the project.


(August 7, 2025) -- A preconstruction meeting for this project occurred this week.  Work is expected to begin in mid-August.


(July 31, 2025)  -- No update to previous information.


(July 25, 2025)  -- The pre-construction meeting is scheduled for early August and construction is expected following that meeting. 


(July 17, 2025) -- No update to the previous information. 


(July 3, 2025) -- This project is expected to begin in late-July/August.  There is minimal impact expected to traffic or the sewer system, as small holes are dug at intervals on the sewer pipe on 10th Avenue to guide the pipe liner.  This is a pilot program to see if the smaller sewer pipes can be lined for the much larger West of Market Sewer System project in 2026.


(June 20, 2025) -- No update this week.


(June 12, 2025)  --  No schedule updates.  Staff will begin community outreach for 10th Avenue West in July.


(May 29) -- The lead time for the lining product has been determined at approximately 2 months.  Construction now expected to begin late July.


(May 22, 2025) -- This project is headed to construction, expected to begin in early June. Residents will be notified via mail and project signs.

 

Location

10th Avenue West, Kirkland 98033  View Map

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