In Connecticut, environmental engineering companies focus on solving challenges related to pollution, waste management, water resources, and sustainable practices. These firms offer a range of services, including site assessments, remediation strategies, and regulatory compliance. With increasing environmental awareness, the industry is shifting toward sustainability, emphasizing innovation and climate resilience. Growing public and private investments in infrastructure and green technologies suggest a bright future for this sector, as companies adapt to evolving regulations and client demands while addressing climate change and environmental integrity.

The list features a variety of environmental engineering companies located throughout Connecticut, ranging from small firms with fewer than 50 employees to larger entities with 500 staff. Established between 1975 and 2012, these firms boast expertise in areas such as civil engineering, environmental consulting, and sustainable development. Notable examples include Fuss & O'Neill, with a long history and a robust business model, and more recent entrants like Solli Engineering, focusing on regulatory compliance and stormwater management.

Continue reading to discover the top environmental engineering companies in Connecticut.

Top 20 Environmental Engineering Companies in Connecticut

1. Fuss & O'Neill

• Website: fando.com
• Ownership type: Private
• Headquarters: Hartford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1924
• Headcount: 201-500
• LinkedIn: fuss-%26-o%27neill

Fuss & O'Neill is an engineering firm based in Hartford, Connecticut, established in 1924. The company specializes in civil and environmental engineering services, providing a broad spectrum of solutions that include site planning, climate resilience, and water management. With a workforce of approximately 458 employees, Fuss & O'Neill serves various sectors, including energy, transportation, and water management. Their expertise extends to environmental engineering, where they address air quality, hazardous materials, and brownfield redevelopment. The firm is committed to helping clients navigate complex engineering challenges while ensuring compliance with regulatory requirements. Their projects often focus on sustainability and innovative practices, reflecting their dedication to improving environmental outcomes.

2. LCL - Génie, environnement & développement durable

• Website: lclenvironnement.com
• Ownership type: Private
• Headquarters: Granby, Connecticut, United States (USA)
• Employee distribution: Canada 100%
• Founded year: 2006
• Headcount: 11-50
• LinkedIn: environnement-lcl-inc.

LCL - Génie, environnement & développement durable is an environmental consulting firm based in Granby, Connecticut, established in 2006. With a workforce of approximately 44 employees, the company specializes in providing comprehensive solutions in geo-environment, water engineering, and sustainable development. LCL assists a range of clients, including developers and industries, in navigating environmental regulations and implementing effective management strategies. Their service offerings include environmental assessments, water treatment design, and industrial hygiene consulting. The firm is particularly noted for its expertise in conducting environmental evaluations, characterizing contaminated sites, and rehabilitating affected areas. LCL is also proactive in promoting sustainable practices, having achieved carbon neutrality and offering consultations on waste management and climate change adaptation. Their commitment to environmental integrity and community engagement positions them as a significant contributor to the field of environmental engineering.

3. Loureiro Engineering Associates, Inc.

• Website: loureiro.com
• Ownership type: Private
• Headquarters: Plainville, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1975
• Headcount: 51-200
• LinkedIn: loureiro-engineering

Loureiro Engineering Associates, Inc. is a private engineering and construction firm based in Plainville, Connecticut. Founded in 1975, the company has built a reputation for providing integrated services in engineering, environmental consulting, and construction. With a workforce of approximately 166 employees, Loureiro serves a variety of sectors, including industrial and government clients. Their service portfolio includes environmental assessment and remediation, facility engineering, and environmental health and safety, among others. The firm is particularly noted for its work on Superfund site remediation projects, which require specialized expertise and compliance with stringent regulatory standards. Loureiro's employee-owned model fosters a culture of accountability and commitment to exceptional client service, which is reflected in their high rate of repeat business. The company has expanded its capabilities over the years, adapting to the evolving needs of its clients while maintaining a focus on delivering quality outcomes.

4. CCA Engineering

• Website: ccaengineering.com
• Ownership type: Corporate
• Headquarters: Brookfield, Connecticut, United States (USA)
• Employee distribution: United States (USA) 70%, China 15%, Malaysia 15%
• Latest funding: July 2014
• Founded year: 1978
• Headcount: 11-50
• LinkedIn: cca-engineering

CCA Engineering, officially known as CCA, LLC, is a consulting engineering firm based in Brookfield, Connecticut. Founded in 1977, the company has built a solid reputation for providing civil engineering, environmental services, land surveying, and landscape architecture. CCA serves a variety of clients, including municipalities, industries, and private entities, assisting them in navigating complex regulatory landscapes and designing essential infrastructure projects. The firm prides itself on its commitment to quality, integrity, and innovation, employing a team of licensed professionals, including engineers and environmental specialists. CCA's environmental services division is particularly noteworthy, focusing on regulatory compliance, site assessments, waste management, and water treatment design. This comprehensive approach allows CCA to address a wide range of environmental challenges effectively. With a dedicated staff and a history of successful projects, CCA Engineering continues to play a significant role in the environmental engineering sector.

5. BL Companies

• Website: blcompanies.com
• Ownership type: Private
• Headquarters: Meriden, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1986
• Headcount: 201-500
• LinkedIn: bl-companies

BL Companies, founded in 1986 and based in Meriden, Connecticut, is an employee-owned architecture and engineering firm. The company provides integrated services that include architecture, civil engineering, environmental consulting, and land surveying. With a workforce of approximately 489 employees, BL Companies serves both public and private sector clients across various markets such as energy, healthcare, and public infrastructure. Their environmental services are particularly noteworthy, as they address critical areas like site remediation, environmental compliance, and water quality management. The firm emphasizes collaboration and client satisfaction, which is enhanced by their employee ownership model. This structure fosters a culture of accountability and investment in project outcomes, aligning the interests of the employees with those of their clients.

6. Zuvic

• Website: zuvic.com
• Ownership type: Private
• Headquarters: Rocky Hill, Connecticut, United States (USA)
• Founded year: 1988
• Headcount: 11-50
• LinkedIn: zuvic-carr

Zuvic, officially known as ZUVIC Infrastructure Solutions, is a private engineering firm based in Rocky Hill, Connecticut. Founded in 1988 by Marici Zuvic, the company has built a reputation for providing civil design and environmental assessment services across Connecticut and New England. With a team of professional engineers, environmental professionals, land surveyors, and environmental scientists, Zuvic focuses on a range of services including site-civil design, utility infrastructure, environmental remediation, and transportation design. Their client base includes commercial developers, educational institutions, and utility providers, reflecting their involvement in significant projects that require environmental expertise. Zuvic has successfully managed numerous environmental site assessments and remediation projects, showcasing their ability to tackle complex environmental challenges. Their commitment to regulatory compliance and effective project management positions them as a reliable partner in the environmental engineering sector.

7. Freeman Companies, LLC

• Website: freemancos.com
• Ownership type: Private
• Headquarters: Hartford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: freeman-companies-llc

Freeman Companies, LLC, founded in 2009 and based in Hartford, Connecticut, is a private engineering firm with a workforce of approximately 44 employees. The company specializes in a range of professional services, including civil engineering, landscape architecture, geotechnical engineering, and notably, environmental sciences. They cater to governmental, institutional, and private sector clients, offering tailored solutions to complex engineering and environmental challenges. Their environmental sciences division focuses on preserving natural resources and ensuring compliance with environmental regulations. Freeman Companies has established a reputation for integrating sustainability into their projects, which is evident in their approach to environmental assessments and remediation strategies. The firm is also recognized for its commitment to community engagement and social responsibility, exemplified by initiatives like the Freeman Companies BRIDGE Endowed Engineering Scholarship aimed at supporting minority students in engineering. They are fully licensed across New England and hold various certifications, including MBE, DBE, and SBA 8(a).

8. LRC Group

• Website: lrcconsult.com
• Ownership type: Private
• Headquarters: Cromwell, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1999
• Headcount: 11-50
• LinkedIn: lrc-group

LRC Group, founded in 1999 and based in Cromwell, Connecticut, is a consulting firm that specializes in civil engineering, land surveying, landscape architecture, and environmental services. With a team of approximately 30 professionals, the company serves a variety of clients, including private developers, municipalities, and institutions. Their approach emphasizes collaboration and effective project management, ensuring that clients receive tailored solutions that meet their specific needs. LRC Group's environmental services are particularly noteworthy, as they conduct thorough site investigations and assessments to identify potential environmental liabilities and challenges. This proactive stance helps clients navigate the complexities of environmental regulations and remediation processes. The firm operates across multiple states, including Connecticut, New York, and New Jersey, and has built a reputation for integrity and technical excellence in the projects they undertake. Their commitment to sustainable practices is further underscored by their membership in the U.S. Green Building Council, reflecting their dedication to environmentally sound design and planning.

9. Triton Environmental, LLC

• Website: tritonenvironmental.com
• Ownership type: Corporate
• Headquarters: Guilford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: April 2024
• Founded year: 1995
• Headcount: 11-50
• LinkedIn: triton-environmental

Triton Environmental, LLC is an environmental consulting and engineering services firm based in Guilford, Connecticut. Established in 1995, the company specializes in providing innovative and cost-effective solutions tailored to meet the environmental challenges faced by businesses and organizations. Triton focuses on compliance and environmental management, offering a range of services that help clients navigate complex regulatory landscapes. With a dedicated team of approximately 32 employees, Triton is positioned to deliver personalized service and expertise, ensuring that their clients receive optimal results in their environmental initiatives. The firm operates solely within the United States, emphasizing its commitment to local environmental issues and solutions.

10. HRP Associates, Inc.

• Website: hrpassociates.com
• Ownership type: Private
• Headquarters: Farmington, Connecticut, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Founded year: 1982
• Headcount: 51-200
• LinkedIn: hrp-associates-inc.

HRP Associates, Inc., based in Farmington, Connecticut, is a consulting firm that has been active in the environmental and engineering services sector since its inception in 1982. With a workforce of approximately 143 employees, the company offers a wide range of services that include environmental compliance, risk management, and engineering design. Their clientele spans various industries, such as oil and gas, healthcare, and real estate, which reflects their ability to address complex regulatory challenges and improve operational efficiency. HRP Associates has completed over 30,000 environmental consulting projects, showcasing their extensive experience and expertise. They are particularly known for their work in site investigation, remediation, and environmental liability management. The firm also emphasizes sustainability in its operations, striving to implement innovative solutions that minimize environmental risks. HRP Associates operates multiple offices across the United States and has extended its consulting services to over twenty countries, demonstrating a significant global reach. Their commitment to training and compliance further solidifies their role as a key player in the environmental engineering field.

11. Celtic Energy

• Website: celticenergy.com
• Ownership type: Corporate
• Headquarters: Glastonbury, Connecticut, United States (USA)
• Employee distribution: United States (USA) 69%, United Kingdom (UK) 31%
• Latest funding: January 2019
• Founded year: 2000
• Headcount: 11-50
• LinkedIn: celtic-energy-inc-

Celtic Energy, part of NV5, is a consulting and engineering company based in Glastonbury, Connecticut. Founded in 2000, the firm specializes in providing technology and conformity assessment solutions for both public and private sector clients. Their services cover a wide range of areas, including infrastructure, utility, and building assets. With a workforce of around 16 employees, Celtic Energy is dedicated to enhancing community resources and promoting sustainability. The company has been involved in over 300 sustainability-centered projects, including the planning and design of renewable energy initiatives such as wind and solar energy projects. Their expertise extends to environmental compliance, construction quality assurance, and urban design, making them a significant player in the environmental engineering sector.

12. All-Points Technology Corporation, P.C

• Website: allpointstech.com
• Ownership type: Private
• Headquarters: Waterford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2000
• Headcount: 11-50
• LinkedIn: all-points-technology-corporation-p.c

All-Points Technology Corporation, P.C. (APT) is an engineering and environmental consulting firm based in Waterford, Connecticut. Founded in 2000, APT has built a reputation for providing specialized services to the utility, renewable energy, land development, and telecommunications industries across New England and eastern New York. The firm offers a comprehensive range of services, including environmental siting and permitting, site planning, civil engineering, structural engineering, and construction administration. APT assists clients in navigating the intricate landscape of regulatory compliance, ensuring that projects meet both environmental standards and client objectives. Their expertise extends to conducting environmental due diligence, managing wetlands and natural resources, and utilizing advanced technologies like GIS and drone services for project assessments. APT's commitment to delivering practical solutions and fostering long-term partnerships has made them a reliable partner for businesses requiring expert guidance in site development and construction.

13. GEODesign, Inc.

• Website: geocompanies.com
• Ownership type: Corporate
• Headquarters: Middlebury, Connecticut, United States (USA)
• Employee distribution: United States (USA) 89%, India 11%
• Latest funding: July 2019
• Founded year: 1995
• Headcount: 11-50
• LinkedIn: geodesign

GEODesign, Inc., founded in 1995 and based in Middlebury, Connecticut, is a consulting firm that specializes in geotechnical engineering, environmental consulting, and construction engineering. With a team of approximately 28 employees, the company has built a reputation for providing innovative and practical solutions to clients in the construction and real estate sectors. Their services range from geotechnical reports and subsurface exploration to environmental site assessments and regulatory compliance. GEODesign has been involved in numerous projects across the Eastern and Western United States, addressing complex geotechnical challenges and ensuring adherence to environmental regulations. Their expertise has been particularly valuable in projects involving brownfield sites and emergency responses to natural disasters, showcasing their commitment to restoring and improving the environment. The firm operates multiple offices across several states, including Connecticut, New York, New Jersey, Vermont, and Oregon, allowing them to serve a broad client base effectively.

14. WMC Consulting Engineers

• Website: wmcengineers.com
• Ownership type: Private
• Headquarters: Newington, Connecticut, United States (USA)
• Employee distribution: United States (USA) 83%, Philippines 8%, Serbia 8%
• Founded year: 1988
• Headcount: 11-50
• LinkedIn: wmc-consulting-engineers

WMC Consulting Engineers, founded in 1988 and based in Newington, Connecticut, is a private consulting engineering firm with a focus on civil engineering and infrastructure projects. With a team of approximately 36 employees, the firm has built a reputation for technical excellence and strong community relations. WMC offers a comprehensive range of services, including planning, design, and construction management, primarily serving municipalities, state agencies, and private clients in Connecticut and western Massachusetts. Their expertise spans various areas, including flood and stormwater management systems, water supply systems, and solid waste and recycling projects. Notably, WMC has been involved in significant environmental projects, such as the rehabilitation of the Moodus Reservoir Dam and the design of innovative wastewater treatment systems. Their commitment to using advanced technology and maintaining high standards of quality has earned them recognition in the industry, including awards from the Connecticut Association of Street and Highway Officials and the Connecticut DEEP.

15. JKMuir - Energy & Sustainability in Public Infrastructure

• Website: jkmuir.com
• Ownership type: Private
• Headquarters: Rocky Hill, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2008
• Headcount: 11-50
• LinkedIn: jkmuir

JKMuir - Energy & Sustainability in Public Infrastructure is an engineering consulting firm based in Rocky Hill, Connecticut, established in 2008. The company focuses on energy management and sustainability solutions tailored for municipal, utility, and industrial clients. With a team of civil, environmental, and chemical engineers, JKMuir offers a variety of services, including energy audits, pump system efficiency evaluations, and construction inspection. Their work is centered on helping clients reduce energy consumption and greenhouse gas emissions, particularly in water and wastewater treatment facilities. JKMuir has been involved in numerous projects aimed at optimizing energy use and enhancing the sustainability of public infrastructure. They have collaborated with various state and utility programs to secure funding for energy efficiency initiatives, demonstrating their active role in promoting sustainable practices within the industry. Their commitment to integrating clean energy and carbon neutrality into project planning and execution positions them as a relevant player in the environmental engineering field.

16. EnviroMed Services, Inc.

• Website: enviromedservices.com
• Ownership type: Private
• Headquarters: Meriden, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1986
• Headcount: 11-50
• LinkedIn: enviromed-services-inc

EnviroMed Services, Inc. is an environmental consulting firm based in Meriden, Connecticut, with a focus on industrial hygiene and environmental engineering. Founded in 1986, the company has built a reputation for assisting clients in navigating complex environmental regulations and ensuring safe work environments. Their team comprises licensed professionals, including industrial hygienists, environmental scientists, and safety technicians, who collectively bring a wealth of expertise to the table. EnviroMed's service offerings include hazardous materials investigations, air quality assessments, and comprehensive safety training programs tailored to meet the specific needs of their clients. They have worked with a variety of organizations, from federal and state departments to hospitals and schools, demonstrating their capability to handle projects of varying scales. Their commitment to environmental health and safety is evident in their ongoing projects, such as monitoring lead paint removal operations and conducting indoor air quality assessments. With a focus on compliance and safety, EnviroMed Services continues to play a vital role in the environmental engineering sector.

17. Landmark Facilities Group

• Website: lfginc.com
• Ownership type: Private
• Headquarters: Norwalk, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1988
• Headcount: 11-50
• LinkedIn: landmark-facilities-group

Landmark Facilities Group, Inc. is an engineering firm based in Norwalk, Connecticut, established in 1988. The company specializes in mechanical, electrical, plumbing, and fire protection design services. With a team of skilled engineers, LFG provides comprehensive services that include facility assessments, energy audits, and sustainable design solutions. They cater to a variety of clients, including educational institutions, municipal entities, and historic sites, demonstrating their capability in both new construction and renovation projects. LFG is licensed in over 25 states and has a notable presence in the engineering and design services industry. Their commitment to sustainable practices is evident through their investment in staff training and certifications, including LEED accreditation and expertise in geothermal systems. LFG has successfully completed projects across the United States and internationally, showcasing their adaptability and technical proficiency in various environments.

18. Snyder Civil Engineering, LLC

• Website: snydercivil.com
• Ownership type: Private
• Headquarters: Portland, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2011
• Headcount: 11-50
• LinkedIn: snyder-civil-engineering-llc

Snyder Civil Engineering, LLC, based in Portland, Connecticut, is a private civil engineering firm founded in 2011. With a team of approximately 36 professionals, the company specializes in water supply and distribution systems, providing essential services such as engineering, construction administration, and inspection. Their clientele includes water utilities, municipal agencies, and private developers, all of whom depend on Snyder's expertise to ensure efficient and sustainable water infrastructure projects. The firm is committed to delivering high-quality service while maintaining a strong focus on client needs and project feasibility. Snyder Civil holds professional licenses in multiple states and is a member of organizations like the American Water Works Association and the American Society of Civil Engineers. Their dedication to clean water and sustainable infrastructure positions them as a valuable player in the environmental engineering sector.

19. Atlas Environmental

• Website: atlas-environmental.com
• Ownership type: Private
• Headquarters: Groton, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1994
• Headcount: 1-10
• LinkedIn: atlas-environmental

Atlas Environmental is a full-service environmental consulting firm based in Groton, Connecticut, established in 1994. The company is staffed by experienced geologists, engineers, and environmental professionals who focus on identifying and managing environmental concerns for their clients. Atlas Environmental specializes in environmental compliance and site assessment, providing services that include environmental studies, reporting, and regulatory submissions. Their clientele ranges from gas stations and oil companies to municipalities and manufacturers, showcasing their ability to cater to various sectors. The firm prides itself on managing both large and small projects efficiently, minimizing costs by closely tracking estimates and bids. They maintain comprehensive insurance coverage, ensuring protection for their operations. Atlas Environmental's commitment to regulatory compliance and public water system planning further underscores their role in the environmental engineering industry.

20. Solli Engineering

• Website: solliengineering.com
• Ownership type: Private
• Headquarters: Monroe, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2012
• Headcount: 11-50
• LinkedIn: solli-engineering-llc

Solli Engineering, LLC is a civil engineering firm based in Monroe, Connecticut, founded in 2012. The company specializes in comprehensive civil engineering and land development consulting services for both public and private clients. With a team of around 30 professionals, Solli Engineering offers expertise in site design, geotechnical solutions, traffic engineering, surveying, and permitting. Their approach emphasizes practical solutions that meet regulatory requirements while ensuring successful project execution. Notably, Solli Engineering has a strong focus on environmental considerations, providing services such as stormwater management, ecological restoration, and regulatory compliance. Their portfolio includes a variety of projects across commercial, residential, industrial, and renewable sectors, reflecting their commitment to integrating environmental sustainability into their engineering practices.

Environmental Engineering Insights: Key Companies in Connecticut

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