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Big Dry Creek Sewer Improvements Project


Project Summary

The City of Westminster is investing $32 million to repair and replace sections of large sewer pipe throughout the northern portion of Westminster beginning in 2020. Although mostly out of sight, this network of underground pipes is critical to protecting public health and the environment 24 hours a day, seven days a week. 

The majority of the Big Dry Creek Interceptor Sewer was installed in the 1970’s and 1980’s.  Recent studies have indicated that some of the pipes are in need of rehabilitation and some new pipes are required to ensure adequate capacity for current and future wastewater flows.

Approximately half of this project will involve lining existing pipes using cured-in-place pipe at various locations throughout Westminster. Cured-in-place pipe technology is a cost-effective and reliable alternative to excavating and replacing pipe which reduces both expense and disruption for residents and inconvenience for motorists and trail users. You will see construction vehicles and workers when the cured-in-place pipe is installed, but there will not be heavy construction or road closures.

The other half of this project will involve excavating and installing a new section of pipe and excavating and replacing sections of existing pipe. Most of this work will take place between 110th Ave and Sheridan Blvd on the northern end and east of the Butterfly Pavilion just south of 104th Ave near Westminster Blvd on the southern end. This new pipe will add resiliency and redundancy to the sewer pipe that serves as the main "artery" carrying wastewater to the Big Dry Creek Wastewater Treatment Facility from the northern two-thirds of the City as far west as Standley Lake. This work will impact trails in the open space surrounding City Park. Plenty of notice and trail detour instructions will be provided ahead of construction.

No residential properties will be directly impacted by this project. No impacts to water or wastewater service is anticipated. 

When this work is completed, areas disrupted by this work will be fully restored to original conditions. There may even be some long awaited improvements made to the park and trail system above and beyond current conditions!

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Project Map

Zoom in using the '+' and "-" buttons on the top right. Click any of the colored lines or shapes to get more information. Open the map in a new window. 



Upcoming Projects Out for Bid

Bids have been received for the second and third phases of the pipeline improvements and are being evaluated. 

Project Funding

This project is financed by a Clean Water State Revolving Fund low-interest loan. The Clean Water State Revolving Fund program is administered by the Colorado Water Resources and Power Development Authority with joint funding from the U.S. Environmental Protection Agency and the state of Colorado. Clean Water State Revolving Fund programs operate around the country to provide states and communities the resources necessary to maintain and improve the infrastructure that protects our valuable water resources nationwide.


Colorado Department of Public Health and the Environment Logo

Colorado Department of Local Affairs Logo

Colorado Water Resources and Power Development Authority Logo


Environmental Assessment and Project Needs Assessment

As part of the application process for the Clean Water State Revolving Fund low-interest loan, the city was required to complete a Project Needs Assessment and an Environmental Assessment. The city values public input on capital improvement projects. These assessments are available for review and comment below. Hard copies can be requested by contacting the Utilities and Engineering Division at 303-658-2176 or uediv@cityofwestminster.us. 

Environmental Assessment and Project Needs Assessment

Project Timeline

This project is still being designed making a timeline tentative and subject to change. Construction is expected to begin toward the end of the summer in 2020 and continue through the end of 2022. A more detailed schedule will be provided well before any work begins. 

Resident Notification

The City of Westminster understands that this construction will impact residents as well as users of our parks and open spaces, and greatly appreciates their everyone’s patience. We will make every effort to ensure construction impacts and project updates are communicated early and often.  Sign up for the city's weekly e-newsletter or follow the city on Facebook, Twitter or Nextdoor for regular updates. Direct notification will be delivered by mail or door-to-door to residents and businesses most impacted by this project. 

Why is this project necessary?

If the sewer pipe in the street in front of your home fails, it's a bad day for you and maybe your neighbors. If the sewer pipe that serves as the main "artery" collecting wastewater from your neighborhood and many others fails, it would be a bad day for thousands of people. This project will create a level of redundancy for the main "artery" sewer, so that if it fails, the new pipe can maintain service. This project will also rehabilitate the condition of aging pipes throughout the northern part of Westminster to ensure the reliable, high-quality service our residents expect.

This project was identified following a comprehensive study of the city's sewer system in 2015 and updated in 2018. This study assessed the condition of the existing sewer system, identified risks to maintaining reliable service and prioritized system needs to help the city invest ratepayer funds as efficiently as possible.


Please don't hesitate to reach out to the project team who can be reached by email at bigdrycreeksewer@cityofwestminster.us or by phone at 303-706-3005. Thank you for your patience while we invest in our community!