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10 Crews.
50 Professionals.
One Focus.

In addition to servicing key local, state, and federal agencies, John J. Brennan’s specialized Utility Group is consistently trusted by top utility companies from Connecticut, Rhode Island, Massachusetts, and New York:

  • Aquarion Water

  • Avangrid / Iberdrola - United Illuminating

  • Connecticut Water Company

  • Eversource

  • Greater New Haven WPCA

  • PSE&G

  • Regional Water Authority

  • Southern Connecticut Gas

  • Yankee Gas

End-to-end Project Management


From project planning, through design, construction, maintenance, even 24/7 repair services, Brennan is on the job reliably – and passionately. Our reputation has been built on getting it right the first time, so Brennan customers tend to be return customers.

Expertise in Infrastructure Services

Our Utility Group offers decades of specialized experience in transmission and distribution systems such as:

  • Water main systems

  • Pump stations

  • Underground conduit installation

  • Direct buried cable installation

  • Electric transmission & distribution

  • Power plants & substations

  • Natural gas pipelines

  • Sanitary & storm sewer construction

  • Trenchless technologies/pipe bursting

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