2025 Water Line Replacement Project

Updated: Oct. 24, 2025

Overview

With more than 450 miles of water line delivering more than 5 billion gallons of high quality water to customers each year, it is critical that Longmont takes care of its water lines to provide a reliable and efficient service. The City’s annual Water Line Replacement Program contracts with private sector contractors for replacement of deteriorating lines.

The City of Longmont’s 2024 Water Line Replacement Project will be completed in multiple locations. You can see the schedule and scope of the project below. This schedule is an approximation and is subject to change based on weather and other factors:

Work Zone 1:

• Installation of a water main on Kiteley Lane between Mountain View Avenue and Lanyon Drive.
• Expected duration of work is early November to early December 2025.

Work Zone 2:

• Replace the water main on Pratt Street between 11th Avenue and the north end of Pratt Street.
• Expected duration of work is mid-November to mid-December 2025.

Work Zone 3:

• Replace the water main in the Juniper-Sumner Alley between 12th Avenue and Mountain View Avenue
• Expected duration of work is late November to mid-December 2025, depending on weather.

Impacts to the Community

• Traffic within the construction zones will be impacted during this work. Road closures to through traffic will be employed throughout the project to complete the work in a safe and efficient manner.
• Driveways within the work area may be closed for up to two hours. City or contractor personnel will notify customers before entrances are blocked by the water line installation.
• “No Parking” signs will prohibit on-street parking within the work zones as indicated by the signage.
• Customers may be affected by water outages.
  • Main line connections can take up to 8 hours. Customers will be notified by door hangers placed 48 hours in advance of a planned outage.
  • Individual service connections can take up to 1 hour. Customers will be notified by City or contractor personnel knocking on your door immediately before the outage.
• Work hours are typically weekdays 7 a.m. to 7 p.m.
• After water service is restored, it is a best practice to flush your water service line. You can do this by running cold water from your tap(s) until the water clears.

Your Dollars at Work

The Water Line Replacement Program is paid for through the Water Utility operating fund, which is funded through utility bills.

Selected Water Lines

This annual program prioritizes lines for replacement based on frequency of breaks and ability to complete multiple replacements in a consolidated area. The Water Line Replacement Program is a long-term, strategic effort. Breaks and basic care activities are performed through the City’s utility maintenance operation.

If your home or business is located in one of the replacement locations, you will receive a letter at least one week before the project notifying you of the work to be performed, timeline for completion and anticipated impacts to you.

Construction Process

City and contractor staff perform the following standard planned sequence for replacement of any water line.

• Locate utilities and cut pavement along new water line alignment
• Excavate and install new water line
• Tie in new water line to existing water line (location varies and is site dependent)
• Conduct water quality and pressure testing; usually takes a minimum of 7 days
• Connect individual water services
• Connect the new water line to the existing water line (location varies and is site dependent)
• Complete permanent asphalt paving and site clean-up

Contact

Please contact Water with any questions or concerns related to the Water Line Replacement Program.