The environmental engineering industry in Connecticut comprises a diverse range of companies dedicated to the development and implementation of sustainable technologies. Be it cutting-edge wastewater treatment techniques, rigorous environmental testing, or renewable energy generation, these organizations are at the forefront of the green revolution. They provide services to a wide array of sectors, including residential, commercial, and governmental agencies. Despite the range in applications and clientele, a common thread among these firms is an unwavering commitment to ecological sustainability and high-quality, efficient service. As the impetus for renewable and eco-friendly solutions grows in response to climate change, this industry is poised for continuous expansion and innovation.


Top 20 environmental engineering companies in Connecticut

1. AVANGRID, Inc. (formerly UIL Holdings Corporation)

  • Website: avangrid.com
  • Headquarters: Orange, Connecticut, United States
  • Founded: 1852
  • Headcount: 5001-10000
  • LinkedIn

Avangrid is a leading clean energy company that generates and delivers energy from sustainable, renewable sources. They actively work to protect and enhance the natural environment.


2. Infiltrator Water Technologies (Decentralized Wastewater Treatment Solutions)

  • Website: infiltratorwater.com
  • Headquarters: Old Saybrook, Connecticut, United States
  • Founded: 1987
  • Headcount: 201-500
  • Latest funding type: Acquired
  • LinkedIn

Infiltrator Water Technologies offers environmentally friendly wastewater treatment solutions for housing developments and commercial facilities. They provide a range of products such as septic tanks, drainage systems, pump tanks, and control systems. Their solutions are scalable, cost-effective, and durable, meeting the needs of both residential and commercial customers. The company is known for its innovative technology and commitment to sustainability.


3. Phoenix Environmental Laboratories, Inc.

Phoenix Labs is an environmental testing laboratory that offers high quality testing of soils, water, sludge, solids, and air. They provide services to a diverse client base including small businesses, large engineering firms, and state and federal agencies. With a standard turnaround time of 7 to 10 business days, they offer competitive prices and also provide priority, same-day, and emergency response services.


4. BantamWesson

BantamWesson is a company that offers various programs and services related to reducing energy consumption and helping the environment. They provide products and services such as automatic delivery, energy audits, windows, insulation, electric services, lighting, plumbing, equipment upgrades, generators, and Wi-Fi thermostats. By becoming a customer, individuals can benefit from their expertise in energy-saving solutions.


5. Environmental Energy Services, Inc.

  • Website: eescorp.com
  • Headquarters: Sandy Hook, Connecticut, United States
  • Founded: 1992
  • Headcount: 11-50
  • Latest funding type: Debt Financing
  • LinkedIn

Environmental Energy Services Corporation (EES) is a clean energy company specializing in combustion enhancement, boiler performance optimization, emissions reduction, and water treatment technology. They offer innovative chemistry and engineering solutions for energy facilities worldwide.


6. JKMuir

  • Website: jkmuir.com
  • Headquarters: Rocky Hill, Connecticut, United States
  • Founded: 2008
  • Headcount: 11-50
  • LinkedIn

JKMuir is an engineering firm specializing in the integration of sustainability and clean energy into public infrastructure projects. They provide design, construction, and consulting services to drive renewable energy generation and minimize carbon impacts. Their expertise includes energy management, pump system efficiency, sustainability, and decarbonization.


7. VeruTEK Technologies

  • Website: verutek.com
  • Headquarters: South Windsor, Connecticut, United States
  • Founded: 2006
  • Headcount: 11-50
  • Latest funding type: Acquired
  • LinkedIn

Verutek is a company that specializes in providing innovative solutions for environmental cleanup and remediation. They offer a range of products and services designed to address pollution and contamination issues in various industries.


8. EcoSmart Home Services

  • Website: ecosmartct.com
  • Headquarters: East Berlin, Connecticut, United States
  • Founded: 1985
  • Headcount: 11-50
  • LinkedIn

EcoSmart is a Connecticut-based company that specializes in providing holistic solutions for homeowners to improve energy efficiency, reduce fossil fuel usage, and achieve energy independence. They offer services such as solar panel installation, home batteries, generators, roofing, and home energy audits. With the Inflation Reduction Act, solar ownership combined with incentives can offer a return on investment of 10 years or less for eligible homeowners. EcoSmart is committed to helping customers save money, reduce their environmental impact, and create a more comfortable living environment.


9. Greenleaf Energy Solutions

Greenleaf Energy Solutions is a commercial energy efficiency company that offers practical solutions to meet your energy, environmental, and social ideals. They provide complimentary energy assessments, interest-free project financing, and expertise in utility rebates. Their services include lighting assessment, retrofitting, renewable energy solutions, and mechanical & HVAC solutions.


10. Sonata Scientific

  • Website: sonatascientific.com
  • Headquarters: Danbury, Connecticut, United States
  • Founded: 2008
  • Headcount: 11-50
  • Latest funding type: Grant
  • LinkedIn

Sonata Scientific offers an industrial-strength, game-changing solution based on revolutionary technology for ultra-pure air in critical manufacturing environments, worker safety, and community health. Their IAQ solution destroys VOCs effectively, generates less waste and sustainable air supply.


11. van Zelm Heywood & Shadford, Inc.

  • Website: vanzelm.com
  • Headquarters: Farmington, Connecticut, United States
  • Founded: 1930
  • Headcount: 51-200
  • LinkedIn

Van Zelm Heywood & Shadford, Inc. is an engineering company that provides a range of services. They specialize in designing and planning various projects, offering expertise in fields such as electrical, mechanical, and environmental engineering. With a focus on quality and innovation, they work with clients to deliver effective solutions.


12. Altieri Sebor Wieber LLC

Altieri Sebor Wieber LLC is a MEPF engineering company that provides sustainable design and engineering solutions for various sectors, including museums, educational institutions, and private residences.


13. Edr

  • Website: edrnet.com
  • Headquarters: Shelton, Connecticut, United States
  • Founded: 1990
  • Headcount: 201-500
  • LinkedIn

EDRNet is a company that provides workflow solutions and platform tools to help clients improve efficiency, streamline processes, access data, and manage risk. They offer content and efficiency tools for environmental consultants and building engineers, allowing them to deliver their best work faster.


14. Viridian International Management

  • Website: viridian.com
  • Headquarters: Norwalk, Connecticut, United States
  • Founded: 2009
  • Headcount: 11-50
  • LinkedIn

Viridian is a company that offers products and services related to energy, environmental disclosures, and customer care. They provide solutions for individuals and businesses who are seeking environmentally friendly and sustainable options for their energy needs.


15. Loureiro Engineering Associates, Inc.

  • Website: loureiro.com
  • Headquarters: Plainville, Connecticut, United States
  • Founded: 1975
  • Headcount: 51-200
  • LinkedIn

Loureiro is a full-service engineering and construction company offering a complete suite of integrated services and dedicated experts. They provide a wide array of engineering and construction services to local, state, and federal governmental agencies throughout New England.


16. JP Kempf

  • Website: jpkempf.com
  • Headquarters: Milford, Connecticut, United States
  • Founded: 1979
  • Headcount: 11-50
  • LinkedIn

J.P. Kempf Co. Inc. is a full-service company specializing in refrigeration design for the industrial food and beverage industry. With over 30 years of experience, they provide precision controlled systems at competitive prices. Their expertise in environmentally friendly technology sets them apart, as they continuously advance the art of refrigeration cooling and freezing processes. Contact them today for all your refrigeration needs.


17. Fuss & O'Neill

  • Website: fando.com
  • Headquarters: Manchester, Connecticut, United States
  • Founded: 1924
  • Headcount: 201-500
  • Latest funding type: Grant
  • LinkedIn

Fuss & O'Neill is a full-service civil, transportation, and environmental consulting company. They provide a range of services including engineering, planning, design, and environmental assessment. Their expertise helps shape communities and improve their infrastructure.


18. Tompkins Research and Management Consulting

Tompkins Research and Development (TR&MC) is a consulting firm offering project development and research services in areas such as energy, engineering, and environmental matters. They have expertise in project design, evaluation of power supply options, and development of breeding programs and improvement plans.


19. EarthMaterials.Com

Earth Materials is a technology-focused company that develops and assists with the storage of geospatial data and classifications for open and standardized uses. Their technology includes new research to assist with new digital interactions with earth materials and signatory digital material properties.


20. All-points Technology Corporation, P.C

All-Points Technology Corporation is an Engineering and Environmental firm that provides quality specialized services to the utility, renewable energy, land development, and telecom industries throughout the northeastern United States.


Want to find more environmental engineering companies?


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