Environmental consulting companies in Ohio focus on helping businesses and government agencies navigate environmental regulations and challenges. They offer services like ecological assessments, hazardous waste management, and sustainability strategies. With increasing awareness of environmental issues, this sector is evolving towards incorporating technology and innovative approaches. Noteworthy trends include heightened demand for compliance with sustainability practices and a shift towards renewable resources. Companies joining this sector often prioritize community engagement and environmental stewardship, making them essential partners in addressing ecological challenges.


This listing includes 24 environmental consulting companies across Ohio, varying in size from small organizations to larger firms with hundreds of employees. Founded between 1955 and 2017, these companies are located in cities like Columbus, Cincinnati, and Akron. Each specializes in different facets of environmental consulting, from compliance management to ecological restoration, showcasing the depth of expertise available within the state.


Continue reading to explore Ohio's top environmental consulting companies.


Top 24 Environmental Consulting Companies in Ohio


1. EnviroScience, Inc.

  • Website: enviroscienceinc.com
  • Ownership type: Private Equity
  • Headquarters: Stow, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: July 2017
  • Founded year: 1989
  • Headcount: 51-200
  • LinkedIn: enviroscience-inc.

EnviroScience, Inc., based in Stow, Ohio, has been providing environmental consulting services since its inception in 1989. With a workforce of approximately 160 professionals, the company specializes in a variety of services, including ecological restoration, aquatic surveys, and emergency response. They cater to a wide range of clients, including government agencies, transportation departments, and private organizations, helping them address environmental challenges and comply with regulations. EnviroScience is particularly noted for its expertise in ecological consulting, focusing on areas such as freshwater mussel surveys, water quality monitoring, and invasive species control. Their commitment to delivering tailored solutions and maintaining high standards of service has earned them recognition in the industry. The company operates across multiple regions in the United States, ensuring they can meet the needs of clients nationwide. Their approach combines scientific knowledge with practical application, making them a valuable partner in environmental management.


2. ASC Group, Inc. and ASC/Auxano

  • Website: ascgroup.net
  • Ownership type: Private
  • Headquarters: Columbus, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1986
  • Headcount: 51-200
  • LinkedIn: asc-group-inc-

ASC Group, Inc. and ASC/Auxano, based in Columbus, Ohio, is a consulting firm that has been active since 1986. The company specializes in cultural, environmental, and hazardous materials services, providing expert evaluations and compliance assistance to clients across multiple sectors, including construction and energy. With a team of professionals that includes certified wetlands scientists and environmental specialists, ASC Group is equipped to handle a variety of environmental challenges. They have expanded their services through a merger with Auxano Environmental in 2021, enhancing their capabilities in hazardous and environmental consulting. The firm operates seven regional offices, ensuring they have a strong presence in the Midwest. Their commitment to safety and environmental integrity is evident in their mission to help clients achieve compliance with federal and state regulations, making them a significant player in the environmental consulting industry.


3. PSARA Technologies, Inc.

  • Website: psara.com
  • Ownership type: Private
  • Headquarters: Cincinnati, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1986
  • Headcount: 11-50
  • LinkedIn: psara-technologies-inc-

PSARA Technologies, Inc., based in Cincinnati, Ohio, is the oldest locally owned environmental consulting firm in the area, having been established in 1986. With a team of 22 professionals, the company specializes in a range of services including environmental assessment and remediation, compliance management, stormwater and wastewater engineering, and industrial hygiene. PSARA has built a reputation for helping clients navigate complex environmental regulations and compliance challenges. Their clientele includes manufacturers, petroleum retailers, and public institutions, reflecting their capability to address various environmental needs. The firm prides itself on its collaborative approach, emphasizing transparency and integrity in its client relationships. Over the years, PSARA has contributed to significant environmental projects across the country, showcasing their expertise and commitment to the field.


4. Lawhon & Associates, Inc.

  • Website: lawhon-assoc.com
  • Ownership type: Private
  • Headquarters: Columbus, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1985
  • Headcount: 11-50
  • LinkedIn: lawhon-and-associates-inc.

Lawhon & Associates, Inc. is an environmental consulting and engineering firm based in Columbus, Ohio, with additional offices in Cleveland, Dayton, and Cincinnati. Established in 1985, the company has built a strong foundation in providing environmental services tailored to the needs of both public and private sector clients. Their offerings include hazardous materials assessments, environmental site assessments, air quality evaluations, and NEPA compliance, among others. Lawhon & Associates serves a variety of sectors, including education, healthcare, transportation, and government, helping clients navigate complex environmental regulations and challenges. The firm prides itself on delivering practical and cost-effective solutions, backed by a team of experienced professionals with relevant certifications. As a women-owned business, they hold several local and state certifications, enhancing their credibility in the industry. Their extensive project portfolio showcases their ability to manage environmental risks and ensure compliance with regulatory requirements, making them a notable player in the environmental consulting space.


5. Coldwater Consulting, LLC


Coldwater Consulting, LLC, founded in 2010 and based in Galena, Ohio, is an environmental consulting firm dedicated to providing sustainable solutions for water resources. With a team of 11 to 50 employees, the company offers a comprehensive range of services, including stream and wetland restoration, stormwater management, and environmental permitting. Their expertise extends to biological assessments, grant writing, and watershed planning, making them a multifaceted player in the environmental consulting sector. Coldwater Consulting has worked with various clients, including government agencies and private organizations, to tackle environmental challenges and enhance ecological health. Their commitment to sustainable practices is evident in their project portfolio, which includes significant restoration efforts and innovative stormwater management solutions. The firm operates additional offices in Columbus, Cincinnati, and Lorain, Ohio, further solidifying their regional influence and accessibility.


6. STONE Environmental Engineering & Science


STONE Environmental Engineering & Science, also known as CAP-STONE & Associates, Inc., is an environmental engineering firm based in Columbus, Ohio. Established in 1989, the company specializes in a variety of services including construction, ecological assessments, engineering design, and permitting. They cater to a broad spectrum of clients, from government agencies to private developers, helping them navigate environmental regulations and ensure compliance. STONE has a strong commitment to client satisfaction, emphasizing responsive service and innovative solutions tailored to specific project needs. The firm has been recognized for its excellence, notably receiving the ODOT’s DBE Consultant of the Year award in 2018. This accolade reflects their professionalism and integrity in the industry. With a workforce of 11-50 employees, STONE continues to play a significant role in environmental consulting, particularly in Ohio, while also expanding its capabilities through the acquisition of Columbus Asphalt Paving, enhancing their service offerings in construction and environmental compliance.


7. Ijus LLC

  • Website: ijus.net
  • Ownership type: Corporate
  • Headquarters: Columbus, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: October 2018
  • Founded year: 2005
  • Headcount: 201-500
  • LinkedIn: ijus

Ijus LLC, also known as TRC Companies, Inc., was founded in 2005 and is based in Columbus, Ohio. The company has grown to employ around 88 professionals, focusing on consulting and engineering services. TRC provides a wide array of services, particularly in environmental consulting, construction management, and engineering solutions. They assist clients in navigating complex projects while ensuring compliance with industry standards. Their expertise includes environmental assessments, permitting, and sustainability strategies, which are critical in today's regulatory environment. TRC serves a variety of sectors, including government, commercial, and industrial clients, demonstrating their adaptability and relevance in the field. The firm has not reported any recent funding, indicating a stable operational model without reliance on external financial support.


8. Environmental Design Group

  • Website: envdesigngroup.com
  • Ownership type: Private
  • Headquarters: Akron, Ohio, United States (USA)
  • Employee distribution: United States (USA) 99%, Other 1%
  • Founded year: 1984
  • Headcount: 51-200
  • LinkedIn: environmental-design-group

Environmental Design Group, based in Akron, Ohio, is a private consulting firm founded in 1984. With a workforce of approximately 138 employees, the company specializes in planning, design, and civil engineering services. Their offerings include community planning, ecological and environmental consulting, construction management, and various engineering services related to water resources, transportation, and land development. The firm serves a wide array of clients, including municipalities and private developers, focusing on enhancing community infrastructure and promoting sustainability. Environmental Design Group has established a reputation for its collaborative approach and commitment to quality, integrity, and trust, which are reflected in their core values. Their projects often emphasize ecological considerations, making them a significant player in the environmental consulting field.


9. BrownFlynn, an ERM Group company

  • Website: brownflynn.com
  • Ownership type: Private
  • Headquarters: Cleveland, Ohio, United States (USA)
  • Founded year: 1996
  • Headcount: 11-50
  • LinkedIn: brownflynn

BrownFlynn, an ERM Group company based in Cleveland, Ohio, has been a player in the environmental consulting sector since its founding in 1996. The firm focuses on sustainability solutions, helping organizations across various industries tackle their environmental challenges. With a team of 16 employees, BrownFlynn leverages the extensive resources and expertise of the ERM Group, a global leader in sustainability consulting. Their services include guidance on carbon markets, climate strategies, and ESG compliance, which are increasingly important for businesses aiming to enhance their sustainability practices. BrownFlynn's commitment to operationalizing sustainability for its clients positions it as a relevant entity in the environmental consulting space.


10. Partners Environmental Consulting, Inc.


Partners Environmental Consulting, Inc. is an environmental consulting firm based in Solon, Ohio, with additional offices in New York, New Jersey, and Colorado. Established in 1999, the company specializes in environmental, safety, and engineering services. They cater to a wide range of clients, including both public and private sectors, providing solutions for environmental compliance, safety management, and remediation projects. The firm has a strong focus on brownfield redevelopment, having been involved in the US EPA Brownfield grant program and authoring numerous grants. Their practice areas include assessment, remediation, environmental health and safety compliance, and due diligence for mergers and acquisitions. With a team of experienced professionals, Partners Environmental Consulting is recognized for its innovative problem-solving capabilities and commitment to delivering high-quality, cost-effective solutions. They have successfully managed projects across the United States and in over 50 countries, demonstrating their extensive industry involvement and expertise.


11. Environmental Solutions & Innovations, Inc.


Environmental Solutions & Innovations, Inc. (ESI) is an environmental consulting firm based in Cincinnati, Ohio, founded in 2000. With a workforce of approximately 104 employees, ESI provides a comprehensive suite of services that includes aquatic ecology, civil engineering, conservation and land use planning, cultural resources, environmental monitoring, GIS and remote sensing, regulatory compliance, terrestrial ecology, and wetlands and waterways management. The company serves a variety of industries, including electric transmission, land development, mining, oil and gas, renewable energy, and transportation. ESI is known for its scientific integrity and has built a strong rapport with government agencies, which aids clients in navigating the complexities of environmental regulations. Their expertise allows them to manage intricate projects that often challenge other consulting firms. ESI's focus on regulatory compliance ensures that their clients can proceed with projects while adhering to environmental standards, thus avoiding costly delays. They have not reported any funding, indicating a stable operational model without external financial pressures.


12. Natural Resources Management, LLC


Natural Resources Management, LLC (NRM) is a private environmental consulting firm based in Sylvania, Ohio, established in 2007. The company specializes in geological and environmental services, primarily catering to the mining industry, site-development companies, and various private entities. NRM's expertise includes environmental compliance, resource management, and wastewater treatment, with a strong emphasis on sustainable practices. Their operations extend throughout North America, particularly in the Midwest, where they engage with state and federal agencies to ensure regulatory compliance. NRM's team boasts over 50 years of combined experience, providing a range of services such as environmental monitoring, hydrologic modeling, and mineral evaluations. They also partner with Sludgehammer NW Ohio to offer comprehensive wastewater treatment systems for various applications. NRM's commitment to responsible resource management and environmental quality positions them as a significant player in the environmental consulting industry.


13. Cox-Colvin and Associates, Inc.

  • Website: coxcolvin.com
  • Ownership type: Corporate
  • Headquarters: Plain Township, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: May 2017
  • Founded year: 1995
  • Headcount: 11-50
  • LinkedIn: cox-colvin-and-associates-inc-

Cox-Colvin and Associates, Inc. is an environmental consulting firm based in Plain Township, Ohio, with a workforce of approximately 22 employees. Established in 1995, the company specializes in a variety of environmental services, including data management, environmental monitoring, and regulatory compliance. They cater to a broad spectrum of clients, particularly in the manufacturing and energy sectors, assisting them in navigating the complexities of environmental regulations and challenges. The firm is recognized for its expertise in areas such as groundwater supply, brownfield redevelopment, and vapor intrusion assessment. Cox-Colvin's team comprises professionals with various certifications, including Certified Hazardous Materials Managers and Professional Geologists, which underscores their technical proficiency. Their involvement in significant projects, such as Superfund site assessments and brownfield remediation, highlights their capability to handle complex environmental issues. The company has not reported any recent funding, indicating a stable operational model focused on service delivery rather than expansion through external investment.


14. Ceso, INC.

  • Website: cesoinc.com
  • Ownership type: Private
  • Headquarters: Dayton, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1987
  • Headcount: 201-500
  • LinkedIn: ceso-inc

Ceso, INC. is a professional services firm based in Dayton, Ohio, specializing in engineering, environmental consulting, architecture, and landscape architecture. Founded in 1987, the company has grown to employ over 400 associates across multiple offices in the United States. Ceso serves clients in various sectors, including retail, hospitality, and public works, providing tailored solutions to complex project challenges. Their environmental consulting team is particularly focused on compliance with regulations and environmental conservation, offering services such as environmental assessments, wetland mitigation design, and habitat assessments. Ceso's collaborative approach fosters long-term relationships with clients, ensuring that their projects align with both regulatory requirements and sustainability goals.


15. The Mannik & Smith Group, Inc.

  • Website: manniksmithgroup.com
  • Ownership type: Private Equity
  • Headquarters: Maumee, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: July 2022
  • Founded year: 1955
  • Headcount: 501-1000
  • LinkedIn: the-mannik-%26-smith-group-inc-

The Mannik & Smith Group, Inc. is a consulting and engineering firm based in Maumee, Ohio, established in 1955. With a workforce of approximately 434 employees, the company provides a comprehensive suite of services that includes civil engineering, environmental compliance, construction management, and ecological services. They cater to both public and private sector clients, assisting them in navigating complex projects and regulatory landscapes. The firm is particularly noted for its expertise in brownfield revitalization, where it transforms underutilized land into productive spaces, thereby contributing to community development and environmental sustainability. Their commitment to innovative solutions and effective project management has earned them recognition in the industry, including a ranking among the Midwest's top design firms. The Mannik & Smith Group's focus on environmental compliance and ecological services underscores their role in promoting sustainable practices and ensuring adherence to environmental regulations.


16. HZW Environmental Consultants, LLC

  • Website: hzwenv.com
  • Ownership type: Private
  • Headquarters: Mentor, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1987
  • Headcount: 11-50
  • LinkedIn: hzw-environmental-conslnts

HZW Environmental Consultants, LLC, based in Mentor, Ohio, is a private environmental consulting firm founded in 1987. With a team of 27 professionals, the company specializes in a wide array of services, including environmental compliance, site assessments, safety evaluations, and ecological studies. HZW is recognized for its expertise in Ohio's Voluntary Action Program, where it has played a pivotal role in guiding clients through environmental regulations and remediation processes. The firm has worked with various clients, including industrial, municipal, and commercial entities, to ensure compliance with environmental laws and to address safety concerns. HZW's commitment to quality service is reflected in their client testimonials and their proactive approach to environmental challenges. They maintain a strong presence in the industry, with a focus on delivering effective solutions tailored to the specific needs of their clients.


17. Environmental Enterprises, INC.

  • Website: eeienv.com
  • Ownership type: Private
  • Headquarters: Cincinnati, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1976
  • Headcount: 51-200
  • LinkedIn: environmental-enterprises-inc.

Environmental Enterprises, INC. (EEI), based in Cincinnati, Ohio, is a private environmental services company that specializes in hazardous waste management and disposal. Founded in 1976, EEI has built a reputation for providing a wide array of services, including waste collection, recycling, and environmental assessments tailored to meet the needs of businesses, organizations, and communities. The company operates with a strong emphasis on sustainability, ensuring compliance with environmental regulations while promoting safe disposal practices for hazardous materials. Their services extend to industrial hygiene, indoor air quality assessments, and emergency response, showcasing their capability to handle various environmental challenges. EEI also conducts household hazardous waste collection events, facilitating responsible disposal for communities. Their commitment to innovative technologies and superior technical support positions them as a reliable partner in environmental management.


18. TestAmerica

  • Website: testamericainc.com
  • Ownership type: Corporate
  • Headquarters: North, Ohio, United States (USA)
  • Latest funding: October 2018
  • Founded year: 1997
  • Headcount: 1001-5000
  • LinkedIn: testamerica

TestAmerica, now part of Eurofins Environment Testing, has been a prominent entity in the environmental testing industry since its inception in 1997. The company provides a comprehensive suite of analytical services that cater to various sectors, including air and water quality testing, hazardous waste management, and specialized environmental services. With a workforce of over 900 employees, TestAmerica is equipped to support clients in both public and private sectors. Their commitment to maintaining high standards is reflected in their NELAP accreditation, ensuring that their testing methods meet rigorous quality benchmarks. TestAmerica's role is crucial for organizations striving to comply with environmental regulations, making them a key player in the environmental consulting space.


19. GT Environmental, Inc.

  • Website: gtenvironmental.com
  • Ownership type: Private
  • Headquarters: Columbus, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1995
  • Headcount: 11-50
  • LinkedIn: gt-environmental-inc.

GT Environmental, Inc. is an environmental consulting firm based in Columbus, Ohio, established in 1995. The company specializes in helping clients navigate the intricate landscape of environmental regulations, particularly in air and water quality compliance. With a team of 11 to 50 employees, GT Environmental provides a range of services including air permitting, stormwater and wastewater compliance, hazardous waste management, and strategic planning. They cater to a variety of clients, from small businesses to Fortune 500 companies, as well as state and local governments. Their expertise extends to emergency planning and community right-to-know regulations, showcasing their commitment to public safety and environmental stewardship. GT Environmental has built a reputation for quality service and consistent support in achieving sustainability goals for their clients.


20. MAD Scientist Associates, LLC


MAD Scientist Associates, LLC, based in Westerville, Ohio, is an ecological consulting firm that has been operational since 1998. The company specializes in a variety of services, including ecological surveys, wetlands and streams management, ecological restoration, and environmental education. Their clientele spans engineering firms, municipalities, and educational institutions, all of whom rely on MAD's expertise to navigate complex environmental regulations and enhance ecological stewardship. The firm prides itself on its team of certified professionals, including ecologists and botanists, who provide accurate and timely data to support sustainable land use decisions. MAD Scientist Associates also engages in community education, offering workshops and programs aimed at promoting ecological literacy. Their commitment to environmental stewardship is evident in their approach to projects, which emphasizes collaboration and respect for client needs.


21. EA Group Environmental Analysis and Management


EA Group Environmental Analysis and Management, based in Mentor, Ohio, has been operational since 1982. The company specializes in environmental consulting and laboratory services, focusing on environmental analysis and management. They cater to a variety of sectors, including construction firms, educational institutions, healthcare facilities, and manufacturing companies. EA Group provides a comprehensive suite of services, including environmental assessments, compliance consulting, and laboratory testing. Their laboratory capabilities cover a wide range of analyses, such as asbestos, soil, and water testing. The firm has built a reputation for its expertise in environmental health and safety, helping clients navigate complex regulatory requirements. With a dedicated team of professionals, EA Group has successfully supported numerous projects, ensuring compliance and promoting sustainable practices across various industries.


22. R2O Consulting LLC


R2O Consulting LLC, founded in 2017 and based in Cleveland, Ohio, is an engineering consulting firm that specializes in infrastructure, water management, and environmental solutions. With a team of 15 employees, the company has quickly established itself in the industry by providing a range of services that include hydraulic modeling, environmental permitting, and asset management. R2O Consulting is particularly recognized for its work with public utilities and developers, demonstrating a strong grasp of the complexities involved in managing water resources and infrastructure. The firm has been involved in significant projects, such as the Regional Stormwater Management Program for the Northeast Ohio Regional Sewer District, showcasing their expertise in hydrologic and hydraulic engineering. R2O is committed to delivering innovative and sustainable solutions that not only address current environmental challenges but also benefit future generations. The company is also notable for its focus on promoting employment opportunities for women and minorities within the engineering sector, reflecting a commitment to social responsibility alongside their environmental goals.


23. CTL Engineering, Inc.

  • Website: ctleng.com
  • Ownership type: Private
  • Headquarters: Columbus, Ohio, United States (USA)
  • Employee distribution: United States (USA) 96%, Other 4%
  • Founded year: 1927
  • Headcount: 201-500
  • LinkedIn: ctl-engineering-inc-

CTL Engineering, Inc. is a private engineering consulting firm based in Columbus, Ohio, with a history dating back to 1927. The company employs between 201 and 500 professionals and operates primarily in the United States. CTL Engineering provides a wide array of services, including civil engineering, forensic science, and IT services, but it is particularly noted for its environmental consulting capabilities. Their environmental division specializes in asbestos and hazardous materials management, ecological assessments, stormwater management, environmental remediation, and site assessments. The firm also engages in site and brownfield redevelopment, helping clients navigate the complexities of environmental compliance and sustainability. With a strong emphasis on safety and efficiency, CTL Engineering serves various industries, including construction, healthcare, and manufacturing, ensuring that projects meet regulatory standards and environmental best practices.


24. CBC Engineers & Associates, Ltd


CBC Engineers & Associates, Ltd, operating under the name Koontz Bryant Johnson Williams (KBJW), is a private engineering firm based in Henrico, Virginia. Founded in 1995, the company has grown to employ between 51 and 200 professionals. KBJW provides a wide array of services, including civil engineering, land planning, and environmental compliance. Their environmental services cover compliance testing, natural resource management, and site assessments, which are essential for clients needing to navigate environmental regulations. The firm serves a variety of sectors, including government, education, and renewable energy, showcasing their adaptability in addressing different market needs. KBJW has also been recognized for its workplace culture, receiving accolades as a top workplace in the Richmond area. Their commitment to community involvement is evident through initiatives like Engineers Without Borders, where they contribute to international projects aimed at improving infrastructure and environmental conditions in developing regions.



Environmental Consulting Insights: Key Companies in Ohio


CompanyHeadquarterSizeFoundedOwnership
EnviroScience, Inc.Stow, Ohio, United States (USA)51-2001989Private Equity
ASC Group, Inc. and ASC/AuxanoColumbus, Ohio, United States (USA)51-2001986Private
PSARA Technologies, Inc.Cincinnati, Ohio, United States (USA)11-501986Private
Lawhon & Associates, Inc.Columbus, Ohio, United States (USA)11-501985Private
Coldwater Consulting, LLCGalena, Ohio, United States (USA)11-502010Private
STONE Environmental Engineering & ScienceColumbus, Ohio, United States (USA)11-501989Private
Ijus LLCColumbus, Ohio, United States (USA)201-5002005Corporate
Environmental Design GroupAkron, Ohio, United States (USA)51-2001984Private
BrownFlynn, an ERM Group companyCleveland, Ohio, United States (USA)11-501996Private
Partners Environmental Consulting, Inc.Solon, Ohio, United States (USA)11-501999Private
Environmental Solutions & Innovations, Inc.Cincinnati, Ohio, United States (USA)51-2002000Private
Natural Resources Management, LLCSylvania, Ohio, United States (USA)1-102007Private
Cox-Colvin and Associates, Inc.Plain Township, Ohio, United States (USA)11-501995Corporate
Ceso, INC.Dayton, Ohio, United States (USA)201-5001987Private
The Mannik & Smith Group, Inc.Maumee, Ohio, United States (USA)501-10001955Private Equity
HZW Environmental Consultants, LLCMentor, Ohio, United States (USA)11-501987Private
Environmental Enterprises, INC.Cincinnati, Ohio, United States (USA)51-2001976Private
TestAmericaNorth, Ohio, United States (USA)1001-50001997Corporate
GT Environmental, Inc.Columbus, Ohio, United States (USA)11-501995Private
MAD Scientist Associates, LLCWesterville, Ohio, United States (USA)11-501998Private
EA Group Environmental Analysis and ManagementMentor, Ohio, United States (USA)11-501982Private
R2O Consulting LLCCleveland, Ohio, United States (USA)11-502017Private
CTL Engineering, Inc.Columbus, Ohio, United States (USA)201-5001927Private
CBC Engineers & Associates, LtdCenterville, Ohio, United States (USA)51-2001995Private


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