Environmental consulting companies in Virginia play a vital role in helping clients navigate environmental laws and regulations. These firms offer an array of specialized services, including site assessments, ecological risk evaluations, and remediation strategies. As the focus on sustainability intensifies across industries, the demand for effective environmental guidance is expected to grow. Firms are increasingly utilizing advanced technologies, such as data analytics and ecological modeling, to craft strategies that address climate challenges and promote resource conservation. With climate change and regulatory pressures looming, the industry is poised for significant transformation in the years ahead.


The companies in this series vary in size from small teams to expansive firms with hundreds of employees. They are headquartered in locales like Reston, Arlington, and Richmond, mostly founded within the last few decades, showcasing evolving environmental strategies. These businesses specialize in multiple areas, including ecosystem restoration, compliance consulting, and energy efficiency, each adapting to the changing landscape of legal and societal expectations regarding environmental stewardship. Some firms also engage in international projects, emphasizing broader environmental impacts beyond Virginia.


Read on to discover the top environmental consulting companies in Virginia.


Top 19 Environmental Consulting Companies in Virginia


1. 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.


2. The Cadmus Group

  • Website: cadmusgroup.com
  • Ownership type: Corporate
  • Headquarters: Arlington, Virginia, United States (USA)
  • Employee distribution: United States (USA) 94%, United Kingdom (UK) 3%, Other 3%
  • Latest funding: September 2021
  • Founded year: 1983
  • Headcount: 1001-5000
  • LinkedIn: the-cadmus-group

The Cadmus Group, founded in 1983 and based in Arlington, Virginia, is a consulting firm that specializes in strategic and technical consultancy services across various sectors, including energy, climate, and public health. With a workforce of over 800 employees, Cadmus assists businesses and organizations in navigating complex challenges and developing effective solutions. Their clientele includes utilities and government agencies, reflecting their expertise in sustainability and operational efficiency. Cadmus is actively involved in projects that promote energy efficiency, water resource management, and public health initiatives. They have a strong emphasis on data analytics and advanced technologies to inform their strategies, ensuring that their clients can achieve measurable outcomes. Their commitment to addressing global challenges, such as climate change and resource scarcity, positions them as a relevant player in the environmental consulting industry.


3. Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree Company


Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree Company, is an environmental consulting firm based in Gainesville, Virginia. Established in 1991, WSSI has built a reputation for providing expert services in environmental assessments, permitting, and compliance. The firm serves a wide range of sectors, including private development, government, energy, and education. WSSI's team of professionals is skilled in navigating the intricate web of environmental regulations, ensuring that clients can successfully manage their projects while adhering to legal requirements. Their services cover a broad spectrum, from wetland delineation and environmental site assessments to cultural resource management and stormwater management. With a focus on innovative solutions, WSSI aims to harmonize environmental protection with land use objectives, making them a key player in the environmental consulting field. The company has successfully managed numerous complex projects, demonstrating their capability to handle challenging regulatory environments and deliver results for their clients.


4. Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree Company


Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree Company, is an environmental consulting firm based in Gainesville, Virginia. Founded in 1991, WSSI has built a reputation for its expertise in environmental assessments, permitting, and compliance. The firm primarily operates in the Mid-Atlantic region, providing services to both private developers and government agencies. Their offerings include wetland delineation, environmental site assessments, and compliance with the Clean Water Act. WSSI has been involved in numerous projects that require navigating complex environmental regulations, showcasing their ability to manage intricate permitting processes. The company also emphasizes innovative solutions that balance environmental protection with land use goals, reflecting their commitment to sustainable practices. With a workforce of approximately 152 employees, WSSI continues to play a significant role in the environmental consulting industry, addressing a wide array of environmental challenges.


5. Marstel-Day, LLC

  • Website: marstel-day.com
  • Ownership type: Private
  • Headquarters: Fredericksburg, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2002
  • Headcount: 51-200
  • LinkedIn: marstel-day-llc

Marstel-Day, LLC, founded in 2002 and based in Fredericksburg, Virginia, is an environmental consulting firm that provides a wide array of services. The company focuses on ecosystem restoration, environmental planning, and cultural resource management, primarily serving government clients, including the Department of Defense. Marstel-Day's team comprises professionals with expertise in various fields, including landscape architecture, archaeology, and environmental policy. They are involved in projects that address environmental compliance, sustainability, and natural resource management, showcasing their commitment to enhancing ecological health and cultural preservation. The firm has built a reputation for its thorough approach to environmental assessments and planning, contributing to significant projects across the United States. Their work often involves collaboration with federal, state, and local agencies, reflecting their integral role in the environmental consulting sector.


6. ONE Environmental Group, LLC

  • Website: oneenv.com
  • Ownership type: Private
  • Headquarters: Midlothian, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2009
  • Headcount: 11-50
  • LinkedIn: one-environmental-group-llc

ONE Environmental Group, LLC, based in Midlothian, Virginia, is an environmental consulting firm that has been operational since 2009. The company offers a comprehensive suite of services designed to help clients comply with environmental regulations and manage remediation projects. Their clientele includes businesses and government entities across various sectors, reflecting their adaptability and expertise in addressing a wide range of environmental issues. The firm prides itself on fostering long-lasting relationships with clients, emphasizing a collaborative approach to problem-solving. With a team of professionals experienced in environmental compliance, industrial services, and project management, ONE Environmental Group is equipped to tackle projects of varying sizes and complexities. Their commitment to understanding client objectives and delivering innovative solutions is evident in their extensive service offerings, which include air compliance, industrial hygiene, and stormwater consulting. The company operates multiple offices across the United States, enhancing their ability to serve clients nationwide.


7. Sustainable Design Consulting, LLC


Sustainable Design Consulting, LLC (SDC) is a consulting firm based in Richmond, Virginia, specializing in sustainable design and green building practices. Established in 2002, SDC has built a solid reputation for its expertise in process management, technical services, and training tailored to businesses and organizations in the construction and education sectors. The firm has successfully managed over a thousand commercial-scale projects, helping clients achieve compliance with various green building standards, including LEED and Green Globes. SDC's portfolio spans multiple sectors, including civic and public safety, healthcare, and educational facilities, showcasing their ability to adapt to different project needs. As a certified woman-owned small business, SDC is committed to fostering a sustainable future through innovative solutions and has received numerous awards for its contributions to the industry. The firm operates primarily in the Mid-Atlantic region, with a dedicated team of professionals who bring a wealth of experience and knowledge to each project.


8. Solv LLC

  • Website: solvllc.com
  • Ownership type: Private
  • Headquarters: Mclean, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1993
  • Headcount: 11-50
  • LinkedIn: solv-llc

Solv LLC, founded in 1993 and based in McLean, Virginia, is a private consulting firm that specializes in environmental, energy, engineering, and planning services. With a team of 26 employees, Solv is dedicated to providing sustainable solutions tailored to the needs of government and commercial clients. The firm has built a reputation for delivering high-quality services on schedule and within budget, emphasizing the importance of a safe and collaborative work environment. Solv's expertise spans various areas, including environmental compliance, energy management, and engineering support. They have successfully supported numerous projects for federal agencies, showcasing their ability to navigate complex regulatory frameworks and deliver effective solutions. The founders, Tom Grome and Purvagna Amin, bring extensive experience in environmental and public health issues, further solidifying Solv's position in the industry.


9. TechLaw

  • Website: techlawinc.com
  • Ownership type: Private
  • Headquarters: Chantilly, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1983
  • Headcount: 201-500
  • LinkedIn: techlaw-inc-

TechLaw, based in Chantilly, Virginia, is an environmental consulting firm that has been operational since 1983. The company specializes in remediation and risk assessment services, addressing a wide range of environmental challenges. With a workforce of approximately 145 employees, TechLaw serves various clients, including federal, state, and local government agencies, as well as nonprofit organizations. Their expertise spans several areas, including Superfund remediation, ecological risk assessments, and environmental compliance. TechLaw has been involved in numerous high-profile projects, such as overseeing remediation efforts at contaminated sites and developing toxicity criteria for hazardous substances. The firm has held nearly $1 billion in federal contracts, primarily supporting the U.S. Environmental Protection Agency. Their commitment to environmental protection is evident in their community outreach initiatives and their focus on innovative, scientifically sound solutions to environmental issues.


10. SC&A, Inc.

  • Website: scainc.com
  • Ownership type: Private
  • Headquarters: Arlington, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1981
  • Headcount: 51-200
  • LinkedIn: sc%26a

SC&A, Inc. is a private consulting firm based in Arlington, Virginia, founded in 1981. With a workforce of approximately 77 employees, the company specializes in environmental, energy, communication, and risk management consulting services. SC&A has built a strong portfolio by collaborating with government and industry partners worldwide, providing engineering, technical, planning, and communication expertise. Their mission revolves around supporting meaningful change for a safer and more sustainable world. The firm is dedicated to delivering high-quality consulting services that are customized to meet the unique needs of their clients, reflecting their commitment to environmental integrity and sustainable practices.


11. PRO-telligent, LLC

  • Website: pro-telligent.com
  • Ownership type: Corporate
  • Headquarters: Arlington, Virginia, United States (USA)
  • Employee distribution: United States (USA) 35%, Malawi 24%, Haiti 12%, Other 29%
  • Latest funding: September 2011
  • Founded year: 2000
  • Headcount: 201-500
  • LinkedIn: pro-telligent-llc

PRO-telligent, LLC, a corporate entity based in Arlington, Virginia, is part of Tetra Tech, a consulting firm that specializes in engineering and environmental services. Founded in 2000, the company has built a reputation for addressing intricate challenges related to water management, environmental sustainability, and infrastructure development. With a workforce of approximately 137 employees, PRO-telligent operates not only in the United States but also in various international locations, including Malawi, Haiti, and Afghanistan. Their projects often involve collaboration with government and commercial clients, focusing on delivering practical solutions that enhance environmental quality and promote sustainable practices. Although there is no recent funding reported, the company continues to engage in significant projects that contribute to global environmental efforts.


12. Ecodit

  • Website: ecodit.com
  • Ownership type: Private
  • Headquarters: Arlington, Virginia, United States (USA)
  • Employee distribution: United States (USA) 44%, Lebanon 21%, Zimbabwe 15%, Other 20%
  • Founded year: 1993
  • Headcount: 51-200
  • LinkedIn: ecodit

Ecodit is a women-owned small business based in Arlington, Virginia, established in 1993. The firm specializes in environmental and social development consulting, providing technical assistance to governments, businesses, and local communities worldwide. With a workforce of approximately 91 employees, Ecodit has successfully managed over 250 projects across more than 50 countries. Their expertise spans various sectors, including water resources management, biodiversity conservation, and energy. Ecodit is particularly noted for its role in enhancing community resilience to climate change and facilitating collaboration between governments and businesses to tackle environmental challenges. The company is ISO 9001:2015 certified, reflecting its commitment to quality and continuous improvement in service delivery. Ecodit has also been involved in significant projects funded by USAID, showcasing its capability in handling complex, multi-million-dollar initiatives.


13. Skeo Solutions

  • Website: skeo.com
  • Ownership type: Private
  • Headquarters: Charlottesville, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1996
  • Headcount: 51-200
  • LinkedIn: skeo-solutions

Skeo Solutions Inc., based in Charlottesville, Virginia, is a consulting firm established in 1996. The company specializes in environmental stewardship and social equity, providing a range of services that include GIS geospatial mapping, technical assistance for communities, and support for Superfund and solid waste management initiatives. Skeo Solutions works primarily with government agencies and organizations that prioritize sustainability, showcasing their commitment to addressing complex environmental challenges. Their approach integrates rigorous data analysis with stakeholder engagement, empowering communities to participate in decision-making processes that affect their environment. With a team of skilled professionals, Skeo Solutions has developed a reputation for delivering innovative solutions tailored to the needs of their clients. The firm also actively engages in corporate sustainability practices, such as purchasing carbon offsets to reduce their carbon footprint.


14. ECS Group of Companies

  • Website: ecslimited.com
  • Ownership type: Corporate
  • Headquarters: Chantilly, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: August 2022
  • Founded year: 1988
  • Headcount: 1001-5000
  • LinkedIn: ecs-limited

ECS Group of Companies, founded in 1988 and based in Chantilly, Virginia, is an engineering consulting firm with a workforce of over 2,300 employees. The company specializes in a variety of services, including geotechnical engineering, construction materials testing, environmental assessments, and facilities management. ECS serves a wide array of sectors, such as commercial, government, and healthcare, providing expert consulting and testing services to ensure compliance and project success. Their environmental services are particularly noteworthy, covering areas like site assessments, hazardous materials management, and ecological compliance. ECS operates more than 90 offices across the United States, emphasizing collaboration and client-focused solutions. Their commitment to environmental integrity is evident in their project portfolio, which includes significant contributions to remediation and sustainability efforts.


15. RE Tech Advisors

  • Website: retechadvisors.com
  • Ownership type: Private
  • Headquarters: Mclean, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2017
  • Headcount: 51-200
  • LinkedIn: re-tech-advisors

RE Tech Advisors, founded in 2017 and based in McLean, Virginia, is a sustainability consulting firm dedicated to improving sustainability practices within the built environment. With a team of over 130 professionals, the company provides tailored advisory services that help clients achieve their sustainability goals while enhancing operational efficiency. They serve a wide range of sectors, including commercial real estate, private equity, hospitality, and public organizations such as municipalities and universities. RE Tech Advisors is also involved in significant sustainability initiatives, such as the Better Buildings Initiative, where they support clients in reducing greenhouse gas emissions and improving energy efficiency. Their expertise in data management and analytics further positions them as a valuable partner for organizations looking to navigate the complexities of sustainability compliance and reporting.


16. Waterborne Environmental, Inc.


Waterborne Environmental, Inc. is an environmental consulting firm based in Leesburg, Virginia, established in 1993. The company specializes in ecological risk assessment, environmental modeling, and data collection, catering to businesses and organizations across multiple industries. With a team of experienced scientists and engineers, Waterborne has built a reputation for delivering unbiased results and expert guidance in navigating complex regulatory requirements. Their services include agricultural sustainability, climate change impact assessments, and water quality evaluations, among others. Waterborne's global presence allows them to work with clients in North America, Europe, Latin America, and the Asia/Pacific Rim, showcasing their capability to address environmental challenges on an international scale. The firm has not reported any funding, indicating a stable operational model since its inception.


17. REMSA, Inc.

  • Website: remsainc.com
  • Ownership type: Private
  • Headquarters: Hampton, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1986
  • Headcount: 11-50
  • LinkedIn: remsa-inc-

REMSA, Inc. is an environmental consulting firm based in Hampton, Virginia, established in 1986. The company specializes in a range of environmental services, including Phase I and II environmental site assessments, wetlands permitting, and HAZMAT investigations. They also provide program management and marine support services, catering to both government and private sector clients. REMSA is particularly noted for its work in marine environments, offering services such as marine endangered species observation and water quality monitoring. The firm is a woman-owned business and holds various certifications, which enhance its standing in the industry. With a workforce of around 38 employees, REMSA is committed to protecting natural resources while supporting construction and development projects. Their extensive experience and established client base, which includes federal and state agencies, underscore their relevance in the environmental consulting sector.


18. Dominion Due Diligence Group (D3G)

  • Website: d3g.com
  • Ownership type: Private
  • Headquarters: Midlothian, Virginia, United States (USA)
  • Founded year: 1994
  • Headcount: 51-200
  • LinkedIn: domduediligencegroup

Dominion Due Diligence Group (D3G), founded in 1994 and based in Midlothian, Virginia, is a private consulting firm that specializes in environmental, engineering, and energy due diligence services. With a workforce of approximately 135 employees, D3G has built a strong reputation over its 30 years in the industry. The firm primarily serves lenders, public housing authorities, and developers, providing comprehensive assessments and compliance solutions tailored to the complexities of affordable housing. Their expertise includes environmental site assessments, energy and sustainability evaluations, and capital needs assessments. D3G has successfully completed over 16,000 environmental assessments and has been involved in significant projects that address the needs of public housing and multifamily developments. Their commitment to staying current with industry standards and regulatory changes enhances their ability to deliver effective solutions to clients. D3G's focus on environmental services, particularly in the context of affordable housing, underscores their relevance in the environmental consulting sector.


19. Timmons Group

  • Website: timmons.com
  • Ownership type: Private
  • Headquarters: Richmond, Virginia, United States (USA)
  • Employee distribution: United States (USA) 99%
  • Founded year: 1953
  • Headcount: 501-1000
  • LinkedIn: timmons-group

Timmons Group, founded in 1953 and based in Richmond, Virginia, is a private engineering firm with a workforce of approximately 981 employees. The company specializes in civil engineering, environmental services, and geospatial technology. Timmons Group serves a variety of clients, including government entities and private businesses, providing solutions for infrastructure development and ensuring regulatory compliance. Their environmental services team is particularly notable, as it addresses critical environmental issues and regulatory requirements, offering services such as site due diligence, regulatory permitting, and stream and wetland restoration. The firm is committed to sustainable project outcomes and actively engages in community empowerment initiatives. Timmons Group's comprehensive approach to engineering and environmental consulting makes it a significant player in the industry.



Environmental Consulting Insights: Key Companies in Virginia


CompanyHeadquarterSizeFoundedOwnership
HydroGeoLogic, Inc.Reston, Virginia, United States (USA)501-10001987Private
The Cadmus GroupArlington, Virginia, United States (USA)1001-50001983Corporate
Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree CompanyGainesville, Virginia, United States (USA)201-5001991Private
Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree CompanyGainesville, Virginia, United States (USA)51-2001991Corporate
Marstel-Day, LLCFredericksburg, Virginia, United States (USA)51-2002002Private
ONE Environmental Group, LLCMidlothian, Virginia, United States (USA)11-502009Private
Sustainable Design Consulting, LLCRichmond, Virginia, United States (USA)11-502002Private
Solv LLCMclean, Virginia, United States (USA)11-501993Private
TechLawChantilly, Virginia, United States (USA)201-5001983Private
SC&A, Inc.Arlington, Virginia, United States (USA)51-2001981Private
PRO-telligent, LLCArlington, Virginia, United States (USA)201-5002000Corporate
EcoditArlington, Virginia, United States (USA)51-2001993Private
Skeo SolutionsCharlottesville, Virginia, United States (USA)51-2001996Private
ECS Group of CompaniesChantilly, Virginia, United States (USA)1001-50001988Corporate
RE Tech AdvisorsMclean, Virginia, United States (USA)51-2002017Private
Waterborne Environmental, Inc.Leesburg, Virginia, United States (USA)51-2001993Private
REMSA, Inc.Hampton, Virginia, United States (USA)11-501986Private
Dominion Due Diligence Group (D3G)Midlothian, Virginia, United States (USA)51-2001994Private
Timmons GroupRichmond, Virginia, United States (USA)501-10001953Private


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