Environmental consulting companies play a vital role in guiding businesses and governments towards sustainable practices while ensuring compliance with environmental regulations. This sector includes firms specializing in areas like ecological restoration, climate change mitigation, and air quality assessment. With heightened environmental awareness and increased regulatory scrutiny, the industry is evolving rapidly. Companies here are adopting innovative technologies and data-driven approaches to tackle complex challenges. In recent years, the focus has intensified on sustainability and environmental justice, reflecting a broader societal shift towards greener strategies and solutions. The demand for expert guidance continues to grow as organizations seek to minimize their environmental impact.

The environmental consulting sector features a mix of established and emerging firms across the United States. Companies range in size from smaller operations with under 100 employees to large enterprises employing thousands. Their headquarters span cities like Phoenix and San Francisco, representing a coast-to-coast presence. Most of these firms, founded between the 1960s and 2000s, specialize in areas such as air quality management, remediation, and sustainability planning. Their proficiency helps clients navigate complex environmental regulations while pursuing innovative and sustainable solutions to pressing challenges.

Continue reading to explore the top environmental consulting companies in the US.

Top 23 Environmental Consulting Companies in the US

1. SWCA Environmental Consultants

• Website: swca.com
• Ownership type: Private
• Headquarters: Phoenix, Arizona, United States (USA)
• Employee distribution: United States (USA) 99%
• Founded year: 1981
• Headcount: 1001-5000
• LinkedIn: swca-environmental-consultants

SWCA Environmental Consultants, based in Phoenix, Arizona, is a private environmental consulting firm founded in 1981. With a workforce of approximately 1,505 employees, SWCA provides a comprehensive range of services that include air quality management, cultural resource management, and spill response. The firm serves a variety of clients, including government agencies and private organizations across sectors such as land development and energy. SWCA is committed to helping clients navigate environmental compliance while promoting sustainability. Their projects span multiple areas, including ecological restoration, disaster recovery, and stakeholder engagement. The company is also recognized for its employee ownership model, which fosters a culture of investment in the firm's success. SWCA has received numerous awards for its work and maintains a high client satisfaction rating, indicating its effectiveness in delivering quality environmental consulting services.

2. Environmental Science Associates

• Website: esassoc.com
• Ownership type: Private
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Founded year: 1969
• Headcount: 501-1000
• LinkedIn: environmental-science-associates

Environmental Science Associates (ESA) is a private environmental consulting firm based in San Francisco, California, with a workforce of approximately 715 employees. Established in 1969, ESA specializes in a variety of environmental services, including air quality management, biological resource assessments, and climate change resilience planning. The firm serves a wide range of clients, including federal and state agencies, municipalities, and private sector organizations. ESA is known for its commitment to helping clients navigate complex environmental regulations and implement sustainable practices. Their project portfolio showcases significant contributions to community development, natural resource management, and environmental restoration, reflecting their active role in addressing pressing environmental challenges. ESA operates with a 100% employee ownership model, fostering a culture of accountability and collaboration among its staff. This structure not only enhances employee engagement but also aligns the firm's interests with those of its clients, promoting a shared vision for sustainable outcomes.

3. Geosyntec Consultants

• Website: geosyntec.com
• Ownership type: Private Equity
• Headquarters: Boca Raton, Florida, United States (USA)
• Employee distribution: United States (USA) 87%, Canada 7%, Other 6%
• Latest funding: May 2022
• Founded year: 1983
• Headcount: 1001-5000
• LinkedIn: geosyntec-consultants

Geosyntec Consultants is a consulting and engineering firm based in Boca Raton, Florida, with a workforce of over 2,600 professionals. Established in 1983, the company specializes in environmental management, civil engineering, and infrastructure development. They serve a broad spectrum of clients, including both private enterprises and government entities. Geosyntec's expertise spans various areas, such as contaminated site assessment, water resource management, and ensuring compliance with environmental regulations. The firm is actively involved in addressing complex challenges related to sustainability, infrastructure safety, and environmental protection. Their projects often focus on innovative solutions that meet the evolving needs of their clients while adhering to stringent environmental standards. Geosyntec's commitment to research and development, along with their collaborative efforts with universities and government agencies, underscores their role as a significant contributor to advancements in environmental consulting.

4. Erg

• Website: erg.com
• Ownership type: Corporate
• Headquarters: Concord, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 98%, Other 2%
• Latest funding: $83.0M, October 2010
• Founded year: 1984
• Headcount: 501-1000
• LinkedIn: eastern-research-group-erg-

Erg (Eastern Research Group Inc.) is an environmental consulting firm based in Concord, Massachusetts, with a workforce of approximately 917 employees. Established in 1984, Erg specializes in a wide array of services aimed at enhancing air quality, promoting clean transportation, and safeguarding public health. The firm collaborates with government agencies and organizations to tackle environmental challenges and foster sustainability. Erg's expertise spans various domains, including air quality assessment, climate and resilience solutions, and ecological services. They have been involved in significant projects, such as modeling greenhouse gas emissions for U.S. economic sectors and supporting the development of climate action plans. Their commitment to improving environmental outcomes is evident in their focus on regulatory compliance and technical support, helping clients implement effective solutions. Erg's dedication to social justice and equity in environmental practices further underscores their role in the industry.

5. Environmental Consulting & Technology, Inc. (ECT)

• Website: ectinc.com
• Ownership type: Private
• Headquarters: Gainesville, Florida, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1988
• Headcount: 201-500
• LinkedIn: ectinc

Environmental Consulting & Technology, Inc. (ECT) is a private environmental consulting firm based in Gainesville, Florida, with a workforce of approximately 304 employees. Established in 1988, ECT specializes in a comprehensive range of services that include ecological assessments, remediation, and sustainability planning. The firm serves a variety of clients, including businesses and government entities, assisting them in navigating complex environmental regulations and implementing effective ecological solutions. ECT's expertise spans multiple markets such as power and energy, infrastructure, land development, and natural resources. Their projects often focus on ecological restoration and compliance, showcasing their commitment to sustainability and community engagement. ECT has been involved in significant projects like the transformation of brownfield sites into public greenspaces and habitat restoration initiatives, reflecting their active role in addressing environmental challenges. The company has not reported any funding, indicating a stable operational model without reliance on external financial support.

6. Rincon Consultants, Inc.

• Website: rinconconsultants.com
• Ownership type: Private
• Headquarters: Ventura, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1994
• Headcount: 201-500
• LinkedIn: rincon-consultants-inc

Rincon Consultants, Inc. is an environmental consulting firm based in Ventura, California, established in 1994. The company specializes in a broad spectrum of services, including environmental sciences, land use planning, and sustainability initiatives. With a workforce of approximately 442 employees, Rincon serves a diverse clientele, including government agencies and private developers. Their expertise helps clients navigate complex environmental regulations and implement sustainable practices. Rincon has been involved in numerous projects, such as the California High-Speed Rail Project and various greenhouse gas studies, showcasing their commitment to addressing environmental challenges. The firm also emphasizes innovation through tools like CAPDash and Housing Connect, which enhance their service delivery. Their focus on community planning, climate action, and resilience further underscores their active participation in the environmental consulting industry.

7. CDM Smith

• Website: cdmsmith.com
• Ownership type: Corporate
• Headquarters: Boston, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 63%, India 13%, Qatar 6%, Other 18%
• Latest funding: March 2024
• Founded year: 1947
• Headcount: 5001-10000
• LinkedIn: cdmsmith

CDM Smith Inc. is an engineering and construction firm based in Boston, Massachusetts, with a workforce of approximately 7,930 employees. Founded in 1947, the company specializes in providing consulting, design, program management, and construction services across various sectors, including water, environment, transportation, and energy. CDM Smith serves both public and private clients, helping them navigate complex infrastructure and environmental challenges. The firm is particularly noted for its work in water management, addressing issues such as PFAS contamination and lead in drinking water. Their commitment to sustainability is evident in their innovative solutions aimed at enhancing community resilience and environmental protection. With a significant presence in the United States and international operations in countries like India, Qatar, and Germany, CDM Smith continues to play a vital role in the environmental consulting industry.

8. Kleinfelder

• Website: kleinfelder.com
• Ownership type: Private Equity
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 95%, Canada 4%
• Latest funding: September 2023
• Founded year: 1961
• Headcount: 1001-5000
• LinkedIn: kleinfelder

Kleinfelder, Inc. is an engineering and environmental consulting firm based in San Diego, California. Founded in 1961, the company has grown to employ over 2,600 professionals across the United States, Canada, and Australia. Kleinfelder offers a wide range of services, including environmental assessments, construction materials testing, and construction management. Their expertise extends to environmental planning, permitting, and remediation, addressing both current and emerging environmental issues. The firm serves a variety of sectors, including energy, water, transportation, and government, reflecting their adaptability to different market needs. Kleinfelder's commitment to sustainable practices and regulatory compliance positions them as a significant player in the environmental consulting industry.

9. Civil & Environmental Consultants, Inc.

• Website: cecinc.com
• Ownership type: Corporate
• Headquarters: Moon Township, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 97%, Other 3%
• Latest funding: December 2023
• Founded year: 1989
• Headcount: 1001-5000
• LinkedIn: civil-%26-environmental-consultants-inc-

Civil & Environmental Consultants, Inc. (CEC) is an engineering and environmental consulting firm headquartered in Moon Township, Pennsylvania. Established in 1989, the company has grown to employ over 2,000 professionals across 34 offices nationwide. CEC specializes in a variety of services, including air quality assessments, civil engineering, ecological sciences, environmental engineering, and waste management. The firm serves a broad spectrum of industries, including manufacturing, mining, oil & gas, and public sector clients. CEC is committed to providing integrated solutions that align with their clients' business goals while ensuring compliance with environmental regulations. Their employee-owned model promotes a culture of accountability and collaboration, enhancing their ability to deliver effective and timely results. CEC has been recognized in industry rankings, reflecting its significant role in the environmental consulting sector.

10. Apex Companies, LLC

• Website: apexcos.com
• Ownership type: Venture Capital
• Headquarters: Rockville, Maryland, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Latest funding: February 2023
• Founded year: 1988
• Headcount: 1001-5000
• LinkedIn: apex-companies-llc

Apex Companies, LLC, based in Rockville, Maryland, is a consulting and engineering firm that specializes in environmental solutions, water management, and infrastructure services. Established in 1988, the company has built a reputation for providing expert guidance on regulatory compliance and project management. Apex serves a wide array of clients, including public agencies and private businesses, showcasing its adaptability and expertise across various sectors. The firm emphasizes sustainability and community involvement, reflecting its commitment to responsible environmental practices. Apex's service offerings include stormwater management, environmental assessments, health and safety consulting, and infrastructure engineering. The company has also expanded its capabilities through strategic acquisitions, such as Johnson Engineering and PBS Engineering and Environmental, which enhance its technical expertise and market presence. With a workforce of over 1,300 employees, Apex is well-positioned to address the complex challenges faced by its clients in today's environmental landscape.

11. EA Engineering, Science, and Technology, Inc., PBC

• Website: eaest.com
• Ownership type: Private
• Headquarters: Cockeysville, Maryland, United States (USA)
• Employee distribution: United States (USA) 98%, Other 2%
• Founded year: 1973
• Headcount: 501-1000
• LinkedIn: ea-engineering-science-and-technology-inc-

EA Engineering, Science, and Technology, Inc., PBC, based in Cockeysville, Maryland, is an environmental consulting and engineering services firm that has been operational since 1973. The company specializes in providing solutions for contaminated site assessment, climate change strategies, and natural resource management. They serve a broad spectrum of clients, including federal, state, municipal, and private sector entities. As a public benefit corporation, EA emphasizes sustainability and community support, integrating these principles into their business model. Their services cover a wide array of environmental challenges, such as managing chemicals of emerging concern, ensuring coastal resilience, and conducting ecotoxicology laboratory work. With a workforce of approximately 825 employees, EA is committed to delivering technically sound and operationally efficient solutions that address complex environmental issues. Their focus on corporate sustainability and community engagement further underscores their role in improving environmental quality.

12. Trinity Consultants

• Website: trinityconsultants.com
• Ownership type: Private Equity
• Headquarters: Dallas, Texas, United States (USA)
• Employee distribution: United States (USA) 93%, Canada 3%, Other 4%
• Latest funding: June 2021
• Founded year: 1974
• Headcount: 1001-5000
• LinkedIn: trinity-consultants

Trinity Consultants, based in Dallas, Texas, is a consulting firm that specializes in environmental consulting, engineering, and technology solutions. Established in 1974, the company has developed a robust portfolio of services aimed at assisting businesses in achieving regulatory compliance and enhancing sustainability practices. Their expertise spans multiple sectors, including manufacturing, energy, and life sciences, where they provide critical services such as environmental assessments, software solutions, and training programs. Trinity's commitment to addressing environmental challenges is evident in their comprehensive approach, which integrates technical expertise with innovative solutions. The firm has also expanded its capabilities through strategic acquisitions, further solidifying its position in the environmental consulting industry. With a workforce of approximately 1,839 employees, Trinity Consultants continues to play a significant role in helping organizations navigate the complexities of environmental regulations and sustainability initiatives.

13. HydroGeoLogic, Inc.

• Website: hgl.com
• Ownership type: Private
• Headquarters: Reston, Virginia, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1987
• Headcount: 501-1000
• LinkedIn: hydrogeologic-inc.

HydroGeoLogic, Inc. (HGL) is an environmental consulting and engineering services firm based in Reston, Virginia. Established in 1987, HGL specializes in environmental cleanup and remediation, catering primarily to government and military clients. The company is recognized for its expertise in tackling complex environmental challenges, including PFAS (per- and polyfluoroalkyl substances) response, climate change planning, and advanced modeling services. HGL's capabilities extend to military munitions response, mining reclamation, and water resource management. With a workforce of approximately 431 employees, the firm has built a reputation for delivering innovative solutions that ensure compliance with environmental regulations. HGL's commitment to quality and safety is evident in its operational practices and client testimonials, which highlight their effectiveness in managing significant environmental projects.

14. LimnoTech

• Website: limno.com
• Ownership type: Private
• Headquarters: Ann Arbor, Michigan, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1975
• Headcount: 51-200
• LinkedIn: limnotech

LimnoTech is an environmental consulting and engineering firm based in Ann Arbor, Michigan, with a focus on water resource management and ecological restoration. Established in 1975, the company has built a reputation for providing comprehensive services to government agencies, municipalities, and organizations. Their expertise spans a variety of areas, including climate change adaptation, water quality monitoring, and urban revitalization. LimnoTech's team of engineers and scientists is dedicated to addressing environmental challenges and ensuring compliance with regulations. They have worked on numerous projects that emphasize sustainable practices and innovative solutions, contributing to the health of ecosystems and communities. The firm operates entirely as an employee-owned company, which fosters a collaborative culture and a commitment to excellence in their work.

15. Brightworks Sustainability

• Website: brightworks.net
• Ownership type: Private
• Headquarters: Portland, Oregon, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2001
• Headcount: 51-200
• LinkedIn: brightworks-sustainability-advisors

Brightworks Sustainability, based in Portland, Oregon, is a consulting firm that specializes in sustainability and ESG practices. Founded in 2001 by Scott Lewis, the firm has grown to a team of 62 professionals dedicated to helping organizations improve their environmental impact and operational performance. Brightworks offers a comprehensive suite of services, including decarbonization strategies, green building consulting, and energy management. They have worked with clients across more than 35 industries, showcasing their ability to tailor solutions to meet specific needs. The firm has also been involved in significant projects, such as developing climate action plans for municipalities and implementing sustainability measures for educational institutions. Brightworks is recognized for its innovative approach and commitment to advancing sustainability practices, making it a notable player in the environmental consulting sector.

16. Barr Engineering Co.

• Website: barr.com
• Ownership type: Private
• Headquarters: Minneapolis, Minnesota, United States (USA)
• Employee distribution: United States (USA) 94%, Canada 6%
• Founded year: 1966
• Headcount: 1001-5000
• LinkedIn: barr-engineering-co

Barr Engineering Co., founded in 1966 and based in Minneapolis, Minnesota, is a consulting firm that specializes in engineering and environmental services. With a workforce of over 1,000 employees, the company operates primarily in the United States and Canada. Barr Engineering provides tailored solutions to clients in various sectors, including fuels, manufacturing, mining, and public agencies. Their services include environmental investigation and remediation, engineering design, environmental permitting, and sustainability practices. The firm emphasizes a collaborative approach, leveraging the expertise of its employee-owners to address complex challenges and achieve sustainable outcomes. Barr has been involved in numerous projects that focus on restoring natural resources, improving water quality, and ensuring compliance with environmental regulations. Their commitment to client success and community impact is evident in their project portfolio and operational philosophy.

17. Lsa

• Website: lsa.net
• Ownership type: Private
• Headquarters: Irvine, California, United States (USA)
• Employee distribution: United States (USA) 95%, Mexico 3%, Other 1%
• Founded year: 1976
• Headcount: 201-500
• LinkedIn: lsa-associates-inc-

LSA Associates, Inc., based in Irvine, California, is a private environmental consulting firm founded in 1976. With a workforce of over 500 employees, LSA specializes in a range of services including air quality analysis, climate change assessments, and sustainability strategies. The firm assists clients in both the public and private sectors, ensuring compliance with environmental regulations such as the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA). LSA operates multiple offices across California, allowing them to serve a wide array of projects, from transportation and utilities to land development and healthcare. Their commitment to environmental sustainability is evident through initiatives like their Green Team, which promotes eco-friendly practices within the company. LSA has also been involved in significant projects, including the Orange County Sustainable Communities Strategy and the Apple Campus 2 Project EIR, showcasing their capability in handling complex environmental assessments.

18. INTERA Incorporated

• Website: intera.com
• Ownership type: Private
• Headquarters: Austin, Texas, United States (USA)
• Employee distribution: United States (USA) 88%, France 4%, Australia 3%, Other 4%
• Founded year: 1974
• Headcount: 201-500
• LinkedIn: intera

INTERA Incorporated, founded in 1974 and based in Austin, Texas, is a consulting firm that specializes in environmental and water resource management. With a workforce of approximately 266 employees, the company provides a wide array of services, including air quality consulting, coastal engineering, and radioactive waste management. INTERA serves a variety of clients, primarily businesses and government entities, helping them navigate complex environmental regulations and implement sustainable practices. The firm is recognized for its innovative strategies and sound scientific approaches, which are essential for addressing pressing environmental issues. Their projects span multiple sectors, including mining, oil and gas, and water utilities, showcasing their capability to tackle diverse environmental challenges. INTERA's focus on climate resiliency and emerging contaminants, such as PFAS, indicates their commitment to addressing contemporary environmental concerns. They have also been acknowledged as a top workplace in 2024, reflecting their positive work culture and employee satisfaction.

19. Groundwater & Environmental Services, Inc.

• Website: gesonline.com
• Ownership type: Private
• Headquarters: Wall Township, New Jersey, United States (USA)
• Employee distribution: United States (USA) 97%, Puerto Rico 2%
• Founded year: 1985
• Headcount: 201-500
• LinkedIn: groundwater-%26-environmental-services-inc-

Groundwater & Environmental Services, Inc. (GES) is an environmental consulting firm based in Wall Township, New Jersey. Established in 1985, GES has built a strong reputation in the industry by providing a wide array of services that include air quality management, brownfield restoration, ecological assessments, and remediation. The firm caters to a variety of sectors, notably oil and gas, industrial, and government, helping clients navigate complex environmental regulations and challenges. GES employs a team of scientists, engineers, and technical specialists who work collaboratively to deliver tailored solutions that meet the unique needs of each project. Their innovative use of technology, such as small unmanned aircraft systems for environmental assessments, showcases their commitment to efficiency and safety. GES has also been involved in numerous projects that emphasize their expertise in environmental due diligence and compliance, further solidifying their position in the consulting landscape.

20. Biohabitats

• Website: biohabitats.com
• Ownership type: Private
• Headquarters: Baltimore, Maryland, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1982
• Headcount: 51-200
• LinkedIn: biohabitats

Biohabitats is an ecological consulting firm based in Baltimore, Maryland, founded in 1982. With a team of approximately 86 employees, the company specializes in ecological restoration, conservation planning, and integrated water strategies. They work with municipalities, educational institutions, and non-profit organizations to tackle environmental challenges such as habitat degradation and climate change. Biohabitats offers a wide array of services, including river and stream restoration, wetland restoration, and climate change adaptation strategies. Their approach combines scientific expertise with community engagement, ensuring that projects are not only effective but also resonate with local stakeholders. The company also engages in design-build services, allowing them to implement their ecological solutions directly. Their commitment to restoring ecosystems and promoting sustainability is evident in their mission to respect ecological limits and inspire stewardship among communities.

21. Integral Consulting Inc.

• Website: integral-corp.com
• Ownership type: Private
• Headquarters: Boulder, Colorado, United States (USA)
• Employee distribution: United States (USA) 99%
• Latest funding: Other (Grant), $379,000, January 2022
• Founded year: 2002
• Headcount: 201-500
• LinkedIn: integral-consulting-inc.

Integral Consulting Inc., based in Boulder, Colorado, is an environmental consulting firm that has been operational since 2002. The company specializes in a broad spectrum of services, including risk assessments, engineering solutions, and sustainability strategies. Integral serves a variety of clients, including businesses and government entities, providing expert guidance on environmental regulations and challenges. Their approach is characterized by collaboration and the integration of a multidisciplinary team, which allows them to deliver customized solutions. Integral has also been involved in significant areas such as coastal climate risk and resilience, offshore wind development, and water resource management. The firm has received funding, with a notable grant in January 2022, which reflects their ongoing commitment to addressing pressing environmental issues. Integral's expertise in emerging contaminants and ecological risk assessment further underscores their relevance in the environmental consulting field.

22. HELIX Environmental Planning, Inc.

• Website: helixepi.com
• Ownership type: Private
• Headquarters: La Mesa, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1991
• Headcount: 201-500
• LinkedIn: helix-environmental-planning-inc-

HELIX Environmental Planning, Inc. is an environmental consulting firm based in La Mesa, California, with a focus on providing comprehensive services to navigate environmental regulations and promote sustainable resource management. Established in 1991, HELIX has built a robust portfolio that includes CEQA/NEPA compliance, biological resource studies, cultural resource management, and habitat restoration. The firm caters to a wide array of sectors, such as water resources, transportation, energy, and private development, showcasing its versatility in addressing environmental issues across different industries. HELIX is committed to helping clients comply with environmental laws while ensuring the sustainable design and construction of projects. With a workforce of 201-500 employees, the company has a significant presence in California, operating multiple offices across the state. Their dedication to community involvement and employee welfare further underscores their commitment to the environmental consulting industry.

23. Dudek

• Website: dudek.com
• Ownership type: Private
• Headquarters: Encinitas, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1980
• Headcount: 501-1000
• LinkedIn: dudek

Dudek is a private consulting firm based in Encinitas, California, founded in 1980. With a workforce of approximately 729 employees, the company has established itself as a significant player in environmental planning, engineering, and project management. Dudek serves a variety of clients, including government agencies and private developers, providing expert guidance on regulatory compliance and project execution. Their work spans multiple sectors such as water, energy, transportation, and conservation, showcasing their ability to adapt to different project needs. The firm has developed a reputation for its comprehensive approach, managing projects through the entire lifecycle, from planning and design to permitting and construction management. This holistic methodology is particularly beneficial in navigating the complexities of environmental regulations and ensuring project success.

Environmental Consulting Insights: Key Companies in the US

Company	Headquarter	Size	Founded	Ownership
SWCA Environmental Consultants	Phoenix, Arizona, United States (USA)	1001-5000	1981	Private
Environmental Science Associates	San Francisco, California, United States (USA)	501-1000	1969	Private
Geosyntec Consultants	Boca Raton, Florida, United States (USA)	1001-5000	1983	Private Equity
Erg	Concord, Massachusetts, United States (USA)	501-1000	1984	Corporate
Environmental Consulting & Technology, Inc. (ECT)	Gainesville, Florida, United States (USA)	201-500	1988	Private
Rincon Consultants, Inc.	Ventura, California, United States (USA)	201-500	1994	Private
CDM Smith	Boston, Massachusetts, United States (USA)	5001-10000	1947	Corporate
Kleinfelder	San Diego, California, United States (USA)	1001-5000	1961	Private Equity
Civil & Environmental Consultants, Inc.	Moon Township, Pennsylvania, United States (USA)	1001-5000	1989	Corporate
Apex Companies, LLC	Rockville, Maryland, United States (USA)	1001-5000	1988	Venture Capital
EA Engineering, Science, and Technology, Inc., PBC	Cockeysville, Maryland, United States (USA)	501-1000	1973	Private
Trinity Consultants	Dallas, Texas, United States (USA)	1001-5000	1974	Private Equity
HydroGeoLogic, Inc.	Reston, Virginia, United States (USA)	501-1000	1987	Private
LimnoTech	Ann Arbor, Michigan, United States (USA)	51-200	1975	Private
Brightworks Sustainability	Portland, Oregon, United States (USA)	51-200	2001	Private
Barr Engineering Co.	Minneapolis, Minnesota, United States (USA)	1001-5000	1966	Private
Lsa	Irvine, California, United States (USA)	201-500	1976	Private
INTERA Incorporated	Austin, Texas, United States (USA)	201-500	1974	Private
Groundwater & Environmental Services, Inc.	Wall Township, New Jersey, United States (USA)	201-500	1985	Private
Biohabitats	Baltimore, Maryland, United States (USA)	51-200	1982	Private
Integral Consulting Inc.	Boulder, Colorado, United States (USA)	201-500	2002	Private
HELIX Environmental Planning, Inc.	La Mesa, California, United States (USA)	201-500	1991	Private
Dudek	Encinitas, California, United States (USA)	501-1000	1980	Private

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