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2020 Trenchless Sewer Repair Project

The city will begin a sewer renewal project in July 2020 at various locations in Historic Westminster.

The project will renew over 15,000 feet of sewer to ensure reliable sewer service for years to come. By using a trenchless method that avoids excavation, the project will save rate payers over $4 million as compared to a dig and replace method. The trenchless method also provides for much quicker construction with less disruption to customers and traffic while extending the useful life of the pipeline .

Project Map 

Click here to view a map of the project.


The contractor will first clean and inspect sewer pipes with vehicles at manholes beginning in June. This work will not impact service.

The contractor will then begin lining sewer pipes later in July. Residents impacted by this work will receive a notice at your door the day before lining begins on their street. 

Normal working hours will be Monday - Friday, 8 a.m. to 5 p.m.


Steam is used to cure or harden the liner during the lining process. People who are nearby may smell an odor that is often described as being similar to plastic or glue. The odor is from the chemical styrene, which is in the resin of the liner. The resin is the part of the liner that reacts with heat and hardens to create a new pipe.

While unpleasant for some, the amount of airborne styrene generated by the lining process is not a health risk. The odor dissipates quickly once the process is complete.

We recommend the following tips to prevent odors from entering your home when your sewer pipe is being lined:

     • Fill all drains with water. Drains that are not used frequently dry out and may let odors in. 
     • Flush toilets and close toilet lids.

Residents connected to the sewers being lined are asked to not send any water down the drain (toilets, showers, laundry, dish washer) while crews are lining the sewer on their street from 8 a.m. to 5 p.m. This will be mentioned again in the notice left the day before construction begins. 

Why do I need to limit my water usage when they line the sewer on my street?

If you live in a single-family home where crews will be lining sewer pipe, your sewer service connection will be temporarily sealed off by the liner once it is inflated. This will prevent any water leaving your home from flowing into the main sewer line while the liner is curing. After the liner has hardened completely, a robot will be inserted in to the pipe to cut a hole where your home is connected to the sewer, and your service will be restored.

To avoid water filling up your private sewer and backing up into your home, you will be asked to limit how much water you use for one day during the lining process. The contractor will ask that you not take showers or baths, wash clothes or dishes, and to turn off all sump pumps connected to the sewer. If you need to, washing your hands and limited flushing of your toilet is okay. Large scale uses of water should be avoided.


Please contact Mary Stahl at 303-658-2220 or mstahl@cityofwestminster.us.