D-Line Sewer Interceptor Upgrade
Location: Mineral Avenue & Santa Fe Drive
Scheduled Construction: Fall 2025
Estimated Cost: $2.63 million
Funding Source: Developer-funded
Project Overview
As new development continues within the district, it’s important to ensure our sewer system has the capacity to keep pace with future growth. While most of the district’s existing sewer interceptors are adequately sized, a section of the D-Line Interceptor near Mineral Avenue and Santa Fe Drive was identified as being undersized.
A previous study used historic wastewater flow data and future land use plans to model system performance as the community grows. At that time, it wasn’t anticipated that several nearby undeveloped parcels would be rezoned by the City of Littleton for higher-density residential and commercial use.
To accommodate this new growth, the district scheduled a sewer upgrade project for 2025. The project will install a parallel section of 36-inch diameter sewer pipe alongside the existing 33-inch D-Line Interceptor. Because this portion of the sewer is very flat, a second larger diameter sewer pipe is needed to handle the additional wastewater and reduce the potential for operational issues.
This capital improvement will be fully funded by developers of the new projects located south of Mineral Avenue and Santa Fe Drive—ensuring that infrastructure upgrades are completed without added cost to existing customers.
Key Project Benefits
- Increased Capacity: Expands the D-Line’s ability to manage future wastewater flows.
- Improved Reliability: Reduces the potential for capacity-related sewer issues.
- Supports Community Growth: Ensures the district’s infrastructure keeps up with new development.
- No Cost to Customers: Fully funded by participating developers.
Construction Impacts
Construction is anticipated to begin in mid-October 2025 near Mineral Avenue and Santa Fe Drive. Temporary closures on the Mary Carter Greenway trail may occur at times throughout the project. The district will coordinate with contractors and local agencies to minimize disruptions and will provide regular updates as work progresses.
For project inquiries, contact the district office at 303-979-2333 or info@swmetrowater.org.
Drone photography by Chris Cochran, Construction Coordinator
