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Lowell Begins Sewer Upgrades in Lower Highlands

The city has launched test pit excavations to advance a massive sewer infrastructure project.

Updated on Oct. 26, 2026 in Utilities

Isometric editorial illustration showing an excavated trench in a city street revealing old pipe segments, representing municipal infrastructure upgrade efforts.
Lowell has initiated test pit excavations in the Lower Highlands as part of a $300 million sewer separation project mandated by the EPA. AI Illustration. Upload story photo >

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Should local governments prioritize expensive, long-term upgrades to aging sewer and water infrastructure?

Lowell is conducting test pit investigations in the Lower Highlands neighborhood as part of a $300 million citywide sewer separation project. This initiative aims to address aging infrastructure and meet federal requirements under an EPA consent decree.

Why it matters

The project is essential for complying with the Clean Water Act by reducing the 430 million gallons of combined sewage discharged into local waterways annually. Separating sewer lines helps improve capacity, prevents backups, and mitigates flooding for city residents.

Approximately 60% of city pipes are currently combined, with at least half of that infrastructure over 100 years old. The city manages nine EPA-permitted outfalls that contribute 430 million gallons of discharge to waterways in a typical year.

The players

Environmental Protection Agency

This federal agency enforces the Clean Water Act and negotiated the consent decree requiring the city to address sewer overflows.

Aqua Line Utility

The utility is responsible for conducting the current test pit investigations to gather data on underground conditions.

The details

Aqua Line Utility is performing the excavations to evaluate subsurface materials and underground utility conditions. The city is working to replace legacy pipes installed between the 1880s and mid-1900s to ensure long-term environmental protection.

Timeline

  1. Test pit work in the Lower Highlands will continue through mid-November 2026.

  2. City sewer separation work began in 2003.

  3. The city negotiated a consent decree with the EPA in October 2023.

  4. The Centralville sewer separation project started in February 2026.

  5. The Belvidere tank construction is scheduled for completion in spring 2027.

Market Landscape

This massive overhaul is a response to the Clean Water Act, marking a shift toward modernizing legacy urban water management systems. The city is aggressively consolidating its infrastructure improvement timeline to meet federal compliance targets by 2032.

Residents in the Lower Highlands may experience localized disruptions while crews complete test pit excavations through mid-November. These long-term infrastructure improvements are designed to reduce the risk of sewer backups and flooding in the community.

The takeaway

The city is prioritizing essential water infrastructure upgrades to protect local waterways and prevent future environmental violations. Residents should stay informed on upcoming project phases as the multi-year effort continues toward its 2032 completion goal.

Further reading

For more background on ongoing infrastructure improvements, visit the Utilities section.

More information

For project timelines and construction updates, see regular updates to the CSO project.

Source note: This article includes information reported by Lowell Sun.

Live Poll

Should local governments prioritize expensive, long-term upgrades to aging sewer and water infrastructure?