Environmental engineering in Virginia focuses on developing solutions to protect the environment while addressing public health needs. Companies in this field tackle issues like water quality, waste management, and land restoration. Trends show a rise in companies leveraging technology for better efficiency and predictive modeling, reflecting the growing interest in sustainability. With increasing regulations and community awareness about environmental impacts, there’s a push toward innovative practices and solutions that not only comply but also promote ecological wellness. Firms in Virginia are increasingly adopting green construction practices, ensuring balance between development and environmental preservation.


The environmental engineering companies in this listing vary in size, with many employing around 50 to 1,000 professionals. Founded between 1953 and 2009, these firms are primarily located in urban settings such as Richmond and Arlington. They cover specializations like civil engineering, site assessments, and ecological restoration. Many firms, like Timmons Group and HydroGeoLogic, are well-regarded for navigating complex regulatory landscapes while providing innovative solutions to environmental challenges.


Continue reading to explore Virginia's notable environmental engineering companies.


Top 24 Environmental Engineering Companies in Virginia


1. 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 noteworthy, as they focus on addressing environmental issues and navigating regulatory requirements. This team is equipped to handle complex project conditions, offering services such as site due diligence, stream and wetland restoration, and natural resource surveys. Timmons Group's commitment to sustainability is evident in their project approach, aiming to create lasting, positive impacts on the communities they serve.


2. 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. Founded in 1987, HGL specializes in environmental cleanup and remediation, addressing complex challenges faced by government and military clients. The company has carved a niche in areas such as PFAS response, climate change planning, and advanced modeling services. HGL's commitment to ensuring compliance with environmental regulations is evident in their work across various projects, including Superfund site remediation and military munitions response. Their innovative approaches, such as the development of proprietary software tools for modeling and optimization, position them as a significant player in the environmental engineering sector. With a workforce of approximately 431 employees, HGL continues to contribute to the field with a focus on sustainable solutions and effective environmental management.


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. Founded in 1991, WSSI has built a reputation for its expertise in environmental assessments, permitting, and compliance. The firm serves a variety of sectors, including private development, government, energy, and education. WSSI's services cover a wide array of environmental needs, such as wetland delineation, stream restoration, and compliance with the Clean Water Act. They have successfully managed thousands of projects, demonstrating their capability in handling complex regulatory requirements. WSSI's team of professionals is dedicated to providing innovative solutions that meet both environmental protection standards and land use objectives. Their commitment to sustainability is evident in their operational practices, including their LEED Gold certified building. WSSI's extensive experience and focus on environmental integrity position them as a notable entity in the environmental consulting industry.


4. 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, based in Arlington, Virginia, is a consulting firm that operates as part of Tetra Tech, a global provider of engineering and environmental services. Founded in 2000, the company has built a reputation for delivering innovative solutions to intricate challenges in water management, environmental sustainability, and infrastructure development. With a workforce of approximately 137 employees, PRO-telligent engages with both government and commercial clients across various regions, including the United States, Malawi, Haiti, Afghanistan, and Palestine. Their projects often focus on enhancing environmental resilience and promoting sustainable practices, reflecting their commitment to improving quality of life through science and technology. While the company has not reported any recent funding, its ongoing projects and initiatives demonstrate a robust involvement in the environmental engineering sector.


5. 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 that specializes in a wide array of services. With a workforce of over 2,300 employees, ECS operates across multiple locations in the United States, providing expertise in geotechnical engineering, construction materials testing, environmental assessments, and facilities management. The company serves various sectors, including commercial, government, and healthcare, ensuring that clients meet compliance standards and achieve project success. ECS's environmental services include Phase I and II site assessments, hazardous materials evaluations, and wetland assessments, reflecting their commitment to environmental stewardship. Their work in remediation and brownfield redevelopment further emphasizes their role in promoting sustainable practices within the industry.


6. Reid Engineering

  • Website: reideng.com
  • Ownership type: Private
  • Headquarters: Fredericksburg, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1977
  • Headcount: 11-50
  • LinkedIn: reid-engineering

Reid Engineering Co. is an environmental and civil engineering firm based in Fredericksburg, Virginia. Founded in 1977, the company has built a solid reputation in the industry, particularly in wastewater treatment and related services. With a team of dedicated engineers, Reid Engineering provides comprehensive solutions that guide clients through the entire project lifecycle—from planning and design to construction and operation. They serve a wide range of clients, including municipal, industrial, and federal sectors, ensuring that all projects meet regulatory compliance while emphasizing cost-effectiveness and sustainability. Their expertise extends beyond wastewater treatment to include areas such as water infrastructure, renewable energy, and beneficial reuse. Reid Engineering is licensed to operate in 37 states, allowing them to deliver their services across a significant portion of the United States. Their commitment to responsible engineering practices reflects a dedication to protecting and sustaining the environment for future generations.


7. 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, based in McLean, Virginia, is a private consulting firm founded in 1993. With a team of approximately 26 employees, the company specializes in environmental, energy, engineering, and planning services. Solv is dedicated to delivering sustainable solutions to both government and commercial clients, ensuring high-quality service and client satisfaction. Their expertise spans various areas, including environmental compliance, energy management, and engineering support. Solv has worked with numerous federal agencies, such as the Department of Defense and the Environmental Protection Agency, providing critical support in environmental planning and management. The founders, Tom Grome and Purvagna Amin, bring extensive experience in managing large-scale environmental projects, further solidifying Solv's reputation in the industry. The firm emphasizes sustainable practices in its operations, aiming to minimize its own environmental impact while helping clients achieve their sustainability goals.


8. RASco, Inc.

  • Website: rascoengineers.com
  • Ownership type: Private
  • Headquarters: Woodbridge, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1991
  • Headcount: 11-50
  • LinkedIn: rasco-inc-

RASco, Inc. is a private engineering and consulting firm based in Woodbridge, Virginia, established in 1991. The company operates as a Service-Disabled Veteran-Owned Small Business and has built a solid reputation for providing a wide range of engineering services. RASco specializes in environmental management, energy management, and facility design, catering to federal, state, and local government agencies, as well as private sector clients. Their expertise includes the design and optimization of water and wastewater treatment systems, stormwater management, and the implementation of Environmental Management Systems (EMS). RASco also emphasizes sustainability through energy auditing and green implementation practices. With a dedicated team of licensed engineers and technicians, the firm is committed to delivering innovative and economically viable solutions to complex environmental challenges. Their recent partnership with Environics Systems further expands their capabilities in environmental monitoring and protection.


9. Koontz Bryant Johnson Williams (KBJW)

  • Website: kbjwgroup.com
  • Ownership type: Private
  • Headquarters: Henrico, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1990
  • Headcount: 51-200
  • LinkedIn: kbjwgroup

Koontz Bryant Johnson Williams (KBJW) is an engineering firm based in Henrico, Virginia, established in 1990. With a workforce of approximately 92 employees, KBJW focuses on civil engineering and environmental services. The company provides a range of solutions for infrastructure projects, environmental compliance, and land planning. Their expertise extends to stormwater management, geotechnical engineering, and onsite wastewater disposal systems. KBJW serves a variety of clients, including government agencies and private sector entities, demonstrating their capability to handle projects of varying scales and complexities. The firm is also involved in community initiatives, such as supporting Engineers Without Borders, which showcases their commitment to social responsibility and sustainable practices. KBJW's structured approach to project management and quality control ensures that they deliver effective and practical solutions tailored to client needs.


10. Schnabel Engineering

  • Website: schnabel-eng.com
  • Ownership type: Private
  • Headquarters: Glen Allen, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1956
  • Headcount: 501-1000
  • LinkedIn: schnabel-engineering

Schnabel Engineering, founded in 1956 and based in Glen Allen, Virginia, is a private engineering firm with a workforce of approximately 597 employees. The company specializes in geotechnical, dam, and tunnel engineering, providing a comprehensive range of services that include design, construction support, and risk management. Schnabel Engineering has built a reputation for addressing complex infrastructure challenges, particularly in the areas of water resources, transportation, and energy. Their projects often involve significant environmental considerations, such as the design and evaluation of dams and levees, as well as wastewater management. The firm has a notable presence in the renewable energy sector, assisting clients in navigating the requirements of solar and wind projects. Schnabel Engineering has established numerous contracts with federal, state, and local governments, showcasing their capability to mobilize quickly and efficiently for various infrastructure needs.


11. 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 company serves a wide range of clients, including private developers and government agencies, helping them navigate the complexities of environmental regulations. WSSI's services cover various aspects of environmental consulting, such as wetland delineation, stream restoration, and cultural resource assessments. With a team of skilled professionals, WSSI has successfully managed numerous projects, ensuring compliance with federal, state, and local environmental laws. Their commitment to balancing environmental protection with land use goals is evident in their innovative solutions and collaborative approach. WSSI operates primarily in the Mid-Atlantic region, where they have established a strong presence and a track record of successful project delivery.


12. Gky

  • Website: gky.com
  • Ownership type: Corporate
  • Headquarters: Chantilly, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: December 2024
  • Founded year: 1975
  • Headcount: 11-50
  • LinkedIn: gky

GKY & Associates, Inc., founded in 1975 and based in Chantilly, Virginia, is a consulting firm that specializes in water resources and environmental sciences. With a team of approximately 44 employees, GKY has built a reputation for providing engineering solutions, policy and planning services, and environmental consulting to both government and business clients. The firm has been instrumental in helping clients navigate complex regulatory landscapes and implement effective water management strategies. GKY's services include stormwater management design, floodplain management, and resilience planning, among others. They also engage in educational initiatives, offering seminars nationwide on water resources engineering and environmental science issues. Their extensive experience and commitment to innovation in water resource management position them as a significant contributor to the environmental engineering sector.


13. VIKA Companies, LLC

  • Website: vika.com
  • Ownership type: Private
  • Headquarters: Tysons, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1980
  • Headcount: 51-200
  • LinkedIn: vika-inc.

VIKA Companies, LLC, founded in 1980 and based in Tysons, Virginia, is a civil engineering firm that provides a range of services including site design, environmental planning, landscape architecture, and surveying. With a workforce of 51-200 employees, VIKA has established a solid presence across multiple states, including Washington, D.C., Maryland, Virginia, and Florida. The firm has a rich history of over four decades in the engineering sector, focusing on collaboration and timely project delivery. VIKA's portfolio showcases their expertise in managing complex projects, such as the Amazon HQ2 and various mixed-use developments. Their approach prioritizes sustainable growth, ensuring that their designs meet both client expectations and community needs. VIKA's commitment to environmental consulting positions them as a relevant player in the environmental engineering field, as they help clients navigate the intricacies of environmental regulations and sustainable practices.


14. 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 aimed at promoting sustainability and compliance with environmental regulations. The company specializes in 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, which allows them to tackle multifaceted projects effectively. Their work includes preparing Environmental Assessments and Impact Statements, managing natural resources, and conducting cultural resource surveys. The firm is dedicated to innovative solutions that address environmental challenges, making significant contributions to projects that enhance ecological resilience and compliance with federal regulations.


15. 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 provides strategic and technical consultancy services across various sectors, including energy, climate, and public health. With a workforce of over 800 employees, Cadmus assists 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 particularly noted for its work in energy efficiency, water management, and climate resilience, helping clients implement programs that promote environmental sustainability. The firm has also engaged in international development projects, showcasing its ability to address global environmental challenges. Cadmus's commitment to enhancing the natural world and society is evident in its comprehensive service offerings, which include advanced analytics, stakeholder engagement, and organizational change management.


16. R.C. Fields & Associates, Inc.

  • Website: rcfassoc.com
  • Ownership type: Private
  • Headquarters: Alexandria, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1986
  • Headcount: 11-50
  • LinkedIn: rc-fields-jr.-%26-associates-pc

R.C. Fields & Associates, Inc. is a professional services firm based in Alexandria, Virginia, established in 1986. With a team of 27 employees, the company specializes in civil engineering, land surveying, and land use planning. They cater to both public and private sector clients, providing expertise in navigating complex land development projects. R.C. Fields is recognized for its commitment to sustainable and environmentally low-impact development, often integrating practices that meet or exceed federal, state, and local standards. Their portfolio includes a variety of projects, from residential subdivisions to commercial developments, with a strong emphasis on environmental impact analysis and stormwater management. The firm has successfully delivered numerous projects that have achieved LEED certification, showcasing their dedication to environmentally responsible design. Their extensive experience in the Northern Virginia region and the District of Columbia allows them to effectively address local regulatory requirements and community needs.


17. AH Engineering Consultants

  • Website: ahenv.com
  • Ownership type: Private
  • Headquarters: Newport News, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1996
  • Headcount: 11-50
  • LinkedIn: ah-environmental-consultants

AH Engineering Consultants, based in Newport News, Virginia, is a private environmental consulting firm founded in 1996. With a workforce of 11 to 50 employees, the company specializes in engineering and scientific solutions across several key areas, including drinking water, wastewater, stormwater, natural resources, hazardous materials, and geospatial services. Their expertise is particularly notable in water management and treatment, where they have developed a strong reputation for delivering practical and effective solutions. AH has worked with a variety of clients, including municipal, industrial, and federal entities, helping them navigate complex regulatory environments and implement sustainable practices. The firm has also contributed to the development of guidance and policy documents for prominent organizations such as the EPA and the CDC, showcasing their involvement and influence in the industry. Their commitment to client satisfaction and project execution has earned them repeat engagements and accolades, particularly from defense-related clients.


18. 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 51-200 employees, the company has carved out a niche in environmental, energy, communication, and risk management consulting. They serve a variety of clients, including government entities and industry partners, both domestically and internationally. SC&A focuses on delivering tailored consulting services that address the unique needs of their clients, emphasizing sustainable practices and effective solutions to complex environmental challenges. Their extensive experience and commitment to quality consulting make them a notable player in the environmental engineering field.


19. Williamsburg Environmental Group, Inc.


Williamsburg Environmental Group, Inc. is a corporate entity based in Williamsburg, Virginia, established in 1990. The firm specializes in environmental consulting and engineering services, addressing a variety of infrastructure and environmental challenges. They serve a broad spectrum of clients, including both government agencies and private sector organizations. The company is known for its innovative approaches to environmental issues, which include assessments, planning, and implementation of solutions that promote sustainability and compliance with environmental regulations. Their experience and expertise in the field have allowed them to maintain a steady presence in the industry, contributing to various projects that aim to enhance environmental quality and infrastructure resilience.


20. 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 specializes in helping clients navigate complex environmental regulations, offering services that include air compliance, site investigation, remediation, and industrial hygiene, among others. With a team of approximately 48 professionals, ONE Environmental Group emphasizes a collaborative approach, working closely with clients to develop tailored solutions that meet their specific needs. Their clientele spans various industries, including pharmaceuticals, manufacturing, and local government, indicating a broad engagement with the market. The firm operates through a network of offices across the United States, allowing them to serve clients nationwide. Their commitment to environmental stewardship is further highlighted by their involvement in community initiatives and regulatory compliance projects.


21. Emsi Engineering INC.

  • Website: emsieng.com
  • Ownership type: Private
  • Headquarters: Manassas, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1987
  • Headcount: 11-50
  • LinkedIn: emsi-engineering-inc.

Emsi Engineering INC. is an engineering and architectural firm based in Manassas, Virginia, established in 1987. The company specializes in a variety of services, including testing and inspections, geotechnical and environmental engineering, surveying, civil engineering, and project management. With a workforce of 32 employees, Emsi Engineering has built a reputation for providing comprehensive consultation across multiple sectors. They serve a wide range of clients, from commercial enterprises to government agencies, ensuring successful project execution. Their environmental engineering services include conducting environmental impact studies, site assessments, and providing solutions for compliance with regulations. Emsi is also recognized as a women-owned business and holds several certifications, which may enhance their opportunities in government contracting and other sectors. Their commitment to quality and thoroughness in environmental assessments positions them as a relevant player in the environmental engineering industry.


22. Sustainable Design Consulting, LLC


Sustainable Design Consulting, LLC (SDC) is a private consulting firm based in Richmond, Virginia, founded in 2002. With a team of 24 professionals, SDC specializes in sustainable design and green building practices, offering a range of services including process management, technical services, facilities services, value assessments, program development, and training. The firm has a strong focus on the Mid-Atlantic region, where it has successfully assisted numerous clients in the construction and education sectors to meet green building standards. SDC has been involved in over a thousand commercial-scale projects, showcasing its expertise in managing green building processes. The company is recognized as a certified woman-owned small business and has received various awards for its contributions to sustainable design. SDC's commitment to fostering a sustainable future is evident in its extensive portfolio, which includes civic, healthcare, educational, and residential projects. They also provide professional training to enhance knowledge and skills in sustainable practices, further contributing to the industry's growth.


23. Burns and Roe Services Corporation


Burns and Roe Services Corporation, known as POWER Engineers, is a private engineering and environmental consulting firm based in Virginia Beach, Virginia. Founded in 1970, the company has built a reputation for providing a wide array of services that include advanced distribution management, environmental planning, and project management. POWER Engineers brings together a team of engineers, scientists, and consultants to address complex engineering challenges. Their work spans multiple industries, focusing on delivering effective and cost-conscious solutions. The firm emphasizes strong client relationships and has been involved in significant projects, such as renewable energy initiatives and environmental compliance efforts. Their commitment to environmental planning and permitting further underscores their role in the environmental engineering sector.


24. Thompson & Litton

  • Website: t-l.com
  • Ownership type: Private
  • Headquarters: Wise, Virginia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1956
  • Headcount: 51-200
  • LinkedIn: thompson-litton

Thompson & Litton, Inc., founded in 1956, is a professional engineering and architecture firm headquartered in Wise, Virginia. With a workforce of over 100 professionals, the company operates multiple offices across Virginia, Tennessee, and West Virginia. They offer a comprehensive range of services, including civil engineering, surveying, architecture, and transportation. A key focus of Thompson & Litton is on sustainable and efficient design solutions, particularly in civil engineering, where they prioritize safe drinking water and responsible wastewater management. Their projects often involve environmental assessments and impact studies, showcasing their commitment to environmental stewardship. The firm is also recognized for its collaborative approach, ensuring that client needs are met with integrity and innovation. As a Virginia SWaM Certified Business and a Federally Certified HUBZone Small Business, Thompson & Litton is well-positioned to serve both public and private sector clients effectively.



Environmental Engineering Insights: Key Companies in Virginia


CompanyHeadquarterSizeFoundedOwnership
Timmons GroupRichmond, Virginia, United States (USA)501-10001953Private
HydroGeoLogic, Inc.Reston, Virginia, United States (USA)501-10001987Private
Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree CompanyGainesville, Virginia, United States (USA)201-5001991Private
PRO-telligent, LLCArlington, Virginia, United States (USA)201-5002000Corporate
ECS Group of CompaniesChantilly, Virginia, United States (USA)1001-50001988Corporate
Reid EngineeringFredericksburg, Virginia, United States (USA)11-501977Private
Solv LLCMclean, Virginia, United States (USA)11-501993Private
RASco, Inc.Woodbridge, Virginia, United States (USA)11-501991Private
Koontz Bryant Johnson Williams (KBJW)Henrico, Virginia, United States (USA)51-2001990Private
Schnabel EngineeringGlen Allen, Virginia, United States (USA)501-10001956Private
Wetland Studies and Solutions, Inc. (WSSI), a Davey Tree CompanyGainesville, Virginia, United States (USA)51-2001991Corporate
GkyChantilly, Virginia, United States (USA)11-501975Corporate
VIKA Companies, LLCTysons, Virginia, United States (USA)51-2001980Private
Marstel-Day, LLCFredericksburg, Virginia, United States (USA)51-2002002Private
The Cadmus GroupArlington, Virginia, United States (USA)1001-50001983Corporate
R.C. Fields & Associates, Inc.Alexandria, Virginia, United States (USA)11-501986Private
AH Engineering ConsultantsNewport News, Virginia, United States (USA)11-501996Private
SC&A, Inc.Arlington, Virginia, United States (USA)51-2001981Private
Williamsburg Environmental Group, Inc.Williamsburg, Virginia, United States (USA)51-2001990Corporate
ONE Environmental Group, LLCMidlothian, Virginia, United States (USA)11-502009Private
Emsi Engineering INC.Manassas, Virginia, United States (USA)11-501987Private
Sustainable Design Consulting, LLCRichmond, Virginia, United States (USA)11-502002Private
Burns and Roe Services CorporationVirginia Beach, Virginia, United States (USA)11-501970Private
Thompson & LittonWise, Virginia, United States (USA)51-2001956Private


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