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127 years of excellence

Quality Performance = Quality Results

Reputation builds upon itself through performance, and it’s our reputation that keeps our customers happy. As a result, they are willing to hire us back to meet the next set of challenges.

Working with these customers, Brennan has honed our skills on multiple projects with unique circumstances and requirements, i.e  hospitals and universities, with tight work spaces, strict schedules and specific environmental needs.

Major Customers include:


  • ACV Enviro

  • Aquarion Water

  • Avangrid/Iberdrola - United Illuminating

  • Clean Harbors

  • Connecticut Water Company

  • Dimeo Construction Company

  • Eversource

  • Greater New Haven WPCA

  • Lockheed Martin

  • PSE&G Power LLC

  • Regional Water Authority

  • Skanska USA Building

  • State of Connecticut

    • Department of Administrative Services​

    • Department of Transportation

  • Southern CT Gas

  • Turner Construction Company

  • Yankee Gas

Additionally, Brennan performs services for various local Municipalities, including:

  • Ansonia

  • Derby

  • Naugatuck

  • Shelton

  • Seymour

  • Southington

  • Stratford

  • West Haven

  • Weston

  • Westport

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