Environmental consulting companies in Illinois are engaged in addressing environmental challenges through innovative assessments, remediation solutions, and regulatory compliance. These firms operate across sectors such as construction, waste management, and sustainability initiatives. They play a critical role in managing risks associated with pollution, waste disposal, and resource conservation. The industry's evolution has led to increased focus on climate change adaptation and green infrastructure, driving demand for expertise in carbon management and ecological restoration. Illinois is poised for growth, fueled by state policies emphasizing environmental stewardship and resilience against climate-related risks.


The 25 companies on this list are primarily focused on environmental consulting services, varying in size from small teams to larger firms with hundreds of employees. Many are based in Chicago, with founding years spanning from 1946 to 2021, showcasing a mix of established players and emerging specialists. Their expertise includes services like site assessments, remediation, ESG consulting, and ecological restoration, catering to both public and private sectors. This dynamic environment reflects a growing trend towards sustainability and compliance within the regional economy.


Continue reading to explore Illinois' top environmental consulting companies.


Top 25 Environmental Consulting Companies in Illinois


1. BBJ Group

  • Website: bbjgroup.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 94%, Pakistan 3%, Nigeria 3%
  • Founded year: 1997
  • Headcount: 51-200
  • LinkedIn: bradburne-briller-%26-johnson-llc

BBJ Group, based in Chicago, Illinois, is an environmental consulting firm founded in 1997. With a workforce of approximately 96 employees, the company specializes in a broad spectrum of services, including environmental engineering, ESG consulting, and remediation. They cater to various sectors such as construction, energy, and government, assisting clients in managing environmental risks and ensuring compliance with regulations. BBJ Group's expertise extends to critical areas like PFAS management, renewable energy solutions, and ecosystem services, reflecting their proactive approach to pressing environmental issues. The firm has successfully completed projects across 28 countries, demonstrating their capability to address complex environmental challenges on a global scale. Their commitment to sustainability and regulatory compliance positions them as a valuable partner for organizations seeking to navigate the intricacies of environmental management.


2. Weaver Consultants Group

  • Website: wcgrp.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1991
  • Headcount: 201-500
  • LinkedIn: weaver-consultants-group

Weaver Consultants Group, founded in 1991 and based in Chicago, Illinois, is a private consulting firm that specializes in engineering services. With a workforce of approximately 357 employees, the company provides a wide array of solutions in solid waste management, environmental services, and civil survey geotechnical services. Their expertise includes permitting, design, construction quality assurance, and operations support, particularly in the solid waste sector. The firm also addresses environmental challenges through air, water, and land services, ensuring compliance with local, state, and federal regulations. Their clientele ranges from small businesses to large corporations, indicating their capability to handle projects of varying scales. Weaver Consultants Group's focus on sustainability and innovative project management further enhances their standing in the environmental consulting industry.


3. RK & Associates, inc

  • Website: rka-inc.com
  • Ownership type: Private
  • Headquarters: Warrenville, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1995
  • Headcount: 1-10
  • LinkedIn: rk-%26-associates-inc

RK & Associates, Inc. (RKA) is an environmental consulting firm based in Warrenville, Illinois, with a focus on providing comprehensive environmental and engineering services. Established in 1995, RKA has built a reputation for delivering high-quality solutions tailored to the specific needs of its clients. The firm specializes in environmental site assessments, air quality management, industrial hygiene, and odor control, serving a wide range of clients from private industries to public sector organizations. RKA's team of experienced professionals is dedicated to ensuring compliance with environmental regulations while maximizing operational efficiency. Their extensive experience in conducting environmental health and safety assessments, compliance audits, and remediation services positions them as a reliable partner for businesses navigating the complexities of environmental regulations. RKA's commitment to personal client relationships and cost-effective strategies has contributed to its growth and sustained relevance in the environmental consulting industry.


4. Jacob & Hefner Associates, Inc.

  • Website: jacobandhefner.com
  • Ownership type: Private
  • Headquarters: Downers Grove, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1996
  • Headcount: 51-200
  • LinkedIn: jacob-and-hefner-associates

Jacob & Hefner Associates, Inc. (JHA) is a civil engineering and environmental consulting firm based in Downers Grove, Illinois, with additional offices across California, Georgia, Texas, and Washington. Founded in 1996, JHA specializes in civil engineering, surveying, and environmental remediation services. The firm caters to a variety of clients, including real estate developers, architects, and government agencies, assisting them in navigating complex projects and regulatory landscapes. JHA's environmental services range from Phase I and II environmental assessments to large-scale remediation projects at significant sites such as aerospace facilities and major airports. Their team comprises experienced professionals, including licensed engineers and geologists, who are well-versed in the latest technologies and regulatory requirements. JHA's commitment to quality and sustainability is evident in their mission to deliver long-lasting solutions that benefit both clients and the environment.


5. TerraCarbon LLC

  • Website: terracarbon.com
  • Ownership type: Private
  • Headquarters: Peoria, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2006
  • Headcount: 11-50
  • LinkedIn: terracarbon-llc

TerraCarbon LLC, founded in 2006 and based in Peoria, Illinois, is a consulting firm that specializes in natural climate solutions. The company assists organizations in developing carbon offset projects aimed at combating climate change and enhancing biodiversity. Their services include project feasibility assessments, design and validation support, monitoring and verification, and the development of methodologies tailored to specific environmental needs. TerraCarbon has successfully supported over 40 projects worldwide, restoring and protecting millions of acres of natural and working lands while achieving significant reductions in greenhouse gas emissions. The firm operates under a fee-for-service model, ensuring independence and integrity in their consulting practices. As a Certified B Corporation, TerraCarbon is committed to balancing profit with purpose, emphasizing the importance of environmental stewardship and community engagement in their projects.


6. Environmental Protection Industries, Inc.


Environmental Protection Industries, Inc. (EPI) is an environmental consulting and remediation firm based in South Holland, Illinois. Established in 1993, the company specializes in a range of services including Brownfield Redevelopment, environmental assessments, and construction management. EPI assists property owners and government agencies in addressing environmental challenges while ensuring compliance with regulatory requirements. Their innovative 'Site Packaging' service provides a streamlined approach to site development, integrating investigatory and remedial work with engineering and permitting processes. EPI has successfully completed numerous projects, demonstrating their expertise and commitment to restoring environments and rebuilding communities. The firm has also been recognized for its growth, appearing on the Inc. 5000 list of fastest-growing private companies in America.


7. Aeterra, LLC

  • Website: aeterra.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2021
  • Headcount: 11-50
  • LinkedIn: aeterra-llc

Aeterra, LLC is an environmental consulting firm based in Chicago, Illinois, founded in 2021. With a team of approximately 35 employees, Aeterra specializes in providing sustainability and compliance solutions to businesses across multiple sectors. Their services include transaction advisory, ESG consulting, air quality management, and site investigation and remediation. Aeterra aims to assist clients in navigating the complexities of environmental regulations while enhancing their sustainability practices. The firm has positioned itself as a trusted partner for organizations seeking to mitigate environmental risks and improve their operational efficiency. Aeterra's focus on actionable solutions and implementation support reflects its commitment to addressing the evolving environmental challenges faced by its clients.


8. Environmental Consulting Group, Inc.


Environmental Consulting Group, Inc. (ECG) is a private environmental consulting firm based in Chicago, Illinois, with a history dating back to 1994. The company provides a comprehensive range of services aimed at identifying and mitigating environmental hazards. Their offerings include asbestos inspection and removal, industrial hygiene assessments, indoor air quality testing, and environmental site assessments. ECG serves a variety of clients, including commercial businesses, educational institutions, and public sector organizations, helping them navigate complex environmental regulations and ensure compliance. With a team of experienced professionals, ECG has built a reputation for delivering prompt and effective consulting and testing services throughout the greater Midwest. Their case studies reflect a commitment to quality and thoroughness in addressing environmental challenges.


9. Imeg

  • Website: imegcorp.com
  • Ownership type: Private
  • Headquarters: Rock Island, Illinois, United States (USA)
  • Employee distribution: United States (USA) 84%, India 16%
  • Founded year: 1955
  • Headcount: 1001-5000
  • LinkedIn: imeg-corp

IMEG is an engineering consulting firm based in Rock Island, Illinois, founded in 1955. With a workforce of nearly 3,000 professionals, IMEG specializes in high-performance building design and infrastructure solutions. The company provides a wide array of services, including civil, structural, mechanical, and electrical engineering, alongside a strong focus on sustainability and performance optimization. IMEG's sustainability initiatives include services such as commissioning, retro-commissioning, and energy modeling, which are essential for enhancing building performance and reducing environmental impact. The firm serves a broad spectrum of clients, including government agencies and private corporations, and has established a reputation for delivering innovative solutions that prioritize efficiency and environmental responsibility. IMEG's commitment to sustainability is further highlighted by their development of tools like the IMEG EcoMeter, which aids in assessing and improving energy performance. Their extensive project portfolio showcases their capability in addressing complex engineering challenges while fostering sustainable practices.


10. ENCAP, Inc.

  • Website: encapinc.net
  • Ownership type: Private
  • Headquarters: Dekalb, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1973
  • Headcount: 11-50
  • LinkedIn: encap-inc.

ENCAP, Inc. is an ecological consulting and contracting firm based in DeKalb, Illinois, established in 1973. The company specializes in ecological restoration, erosion control, and stormwater management, catering to builders, developers, and public agencies. With a team of experts including Erosion and Sediment Control Specialists and Ecological Consultants, ENCAP focuses on identifying and addressing ecological risk factors in various projects. Their services range from ecological consulting to the implementation of best management practices for stormwater discharge. Over the years, ENCAP has completed numerous projects that enhance local ecosystems, demonstrating their commitment to environmental stewardship. The firm has also expanded its capabilities to include contracting services, allowing them to manage projects from planning through execution. This integration of consulting and contracting positions ENCAP as a knowledgeable partner in navigating complex environmental regulations and achieving sustainable outcomes.


11. V3 Companies

  • Website: v3co.com
  • Ownership type: Private
  • Headquarters: Woodridge, Illinois, United States (USA)
  • Employee distribution: United States (USA) 89%, Canada 9%, Other 2%
  • Founded year: 1983
  • Headcount: 201-500
  • LinkedIn: v3-companies

V3 Companies, founded in 1983 and based in Woodridge, Illinois, is a private engineering and consulting firm with a workforce of approximately 461 employees. The company specializes in construction management, environmental services, and municipal consulting, catering to a variety of clients, including developers and government agencies. V3 is dedicated to providing solutions for land development and infrastructure projects, with a strong emphasis on ecological restoration and environmental sustainability. Their portfolio includes notable projects that address environmental challenges, such as transforming brownfields into community parks. V3's commitment to excellence is reflected in their focus on client satisfaction and community improvement, making them a significant player in the environmental consulting industry.


12. Ricondo & Associates, Inc.

  • Website: ricondo.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 96%, United Kingdom (UK) 3%, Other 1%
  • Founded year: 1989
  • Headcount: 51-200
  • LinkedIn: ricondo-%26-associates

Ricondo & Associates, Inc. is a private aviation consulting firm based in Chicago, Illinois, founded in 1989. With a workforce of approximately 173 employees, Ricondo specializes in providing strategic advisory services to airport owners, operators, and airlines. The firm offers a range of services, including business advisory, financial strategies, facilities and operations, and environmental consulting. Their environmental services are particularly noteworthy, as they help clients navigate complex environmental challenges, ensuring compliance with regulations and promoting sustainability initiatives. Ricondo has worked on significant projects across the United States and internationally, demonstrating their expertise in addressing the unique needs of the aviation sector. Their commitment to environmental stewardship is evident in their focus on issues such as aircraft noise, waste management, air quality, and climate change, making them a valuable partner for airports aiming to enhance their environmental performance.


13. Crawford, Murphy & Tilly

  • Website: cmtengr.com
  • Ownership type: Private
  • Headquarters: Springfield, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1946
  • Headcount: 201-500
  • LinkedIn: cmtengineering

Crawford, Murphy & Tilly, Inc. is an engineering consulting firm based in Springfield, Illinois, established in 1946. With a workforce of approximately 456 employees, CMT specializes in infrastructure development, offering a variety of services that include air service development, strategic funding solutions, and notably, environmental consulting. Their expertise helps clients navigate complex infrastructure challenges while enhancing community services. CMT's environmental consulting services are integrated into their broader engineering offerings, which also cover areas such as civil engineering, water resources, and municipal planning. The firm is committed to sustainability, as demonstrated by their installation of a solar power system at their headquarters, which significantly reduces carbon emissions. This commitment to environmental stewardship is a key aspect of their operations, aligning with their mission to create livable and sustainable communities.


14. Pizzo & Associates, Ltd.


Pizzo & Associates, Ltd. is an ecological restoration firm based in Leland, Illinois, established in 1988. The company is dedicated to the preservation and restoration of natural environments, providing a range of services that include habitat restoration, invasive species control, erosion management, and ecological consulting. With a workforce of approximately 51-200 employees, Pizzo & Associates operates primarily in the Midwest, serving clients such as local governments, property managers, and private landowners. The firm has been recognized with over 170 industry awards, reflecting its commitment to enhancing biodiversity and ecological health. Their projects vary in scale, from small private estates to large state forest preserves, demonstrating their capability to handle diverse restoration needs. Pizzo & Associates emphasizes long-term sustainability and community engagement in their restoration efforts, ensuring that their work benefits both the environment and the communities they serve.


15. Baxter & Woodman

  • Website: baxterwoodman.com
  • Ownership type: Private
  • Headquarters: Crystal Lake, Illinois, United States (USA)
  • Employee distribution: United States (USA) 99%, Other 1%
  • Founded year: 1946
  • Headcount: 201-500
  • LinkedIn: baxter-%26-woodman

Baxter & Woodman, founded in 1946 and based in Crystal Lake, Illinois, is a private engineering and consulting firm with a workforce of approximately 357 employees. The company specializes in infrastructure planning, design, and construction, offering a wide range of services that include community and urban planning, water resources management, and wastewater treatment. Their client base primarily consists of municipalities and private organizations seeking to improve community value through sustainable engineering practices. Baxter & Woodman is dedicated to enhancing the quality of life in the communities they serve, focusing on clean water, safe roads, and reliable wastewater systems. Their commitment to environmental stewardship is evident in their project portfolio, which includes ecological assessments and restoration services. The firm operates across multiple states, including Illinois, Florida, Texas, and Wisconsin, and has established a reputation for delivering innovative solutions tailored to the unique needs of each locality.


16. Pioneer Engineering & Environmental Services, LLC


Pioneer Engineering & Environmental Services, LLC, based in Chicago, Illinois, is a private consulting firm that specializes in environmental assessments and engineering services. Established in 1989, the company has built a robust portfolio of services that includes Phase I and II Environmental Site Assessments, site remediation, and geotechnical engineering. With a workforce of approximately 35 employees, Pioneer has successfully navigated the complexities of environmental regulations, assisting clients primarily in the real estate and construction sectors. Their expertise extends to managing contaminated properties, ensuring compliance with environmental standards, and facilitating the redevelopment of brownfield sites. Pioneer has conducted over 30,000 site assessments and is recognized for obtaining nearly 800 NFR letters from the Illinois EPA, underscoring their effectiveness in delivering results. The firm prides itself on its responsiveness and customer service, which has earned them a loyal client base. Their commitment to quality and thoroughness in environmental consulting positions them as a significant player in the industry.


17. Midwest Environmental Consulting Services, Inc.


Midwest Environmental Consulting Services, Inc. is an environmental consulting firm based in Yorkville, Illinois, with additional offices in Chicago, Peoria, and Rockford. Established in 1994, the company has grown from providing asbestos surveys to offering a comprehensive suite of services that includes environmental permitting, compliance, safety training, and various assessments. They cater to a wide range of sectors, such as healthcare, construction, and education, helping clients navigate complex environmental regulations. The firm prides itself on its experienced team, which includes environmental engineers, compliance specialists, and project managers, all dedicated to delivering tailored solutions that meet the unique needs of their clients. Their focus on client satisfaction and a proven track record of successful projects further solidifies their position in the environmental consulting industry.


18. Green Environmental Management

  • Website: green-em.com
  • Ownership type: Private
  • Headquarters: Carol Stream, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1991
  • Headcount: 11-50
  • LinkedIn: green-environmental-management

Green Environmental Management (G|E|M) is an environmental consulting firm based in Carol Stream, Illinois, established in 1991. With a dedicated team of 11-50 employees, G|E|M specializes in a range of services aimed at helping businesses and organizations navigate environmental regulations and assess liabilities associated with their properties. Their offerings include environmental assessments, compliance strategies, and risk management solutions. The firm is particularly known for its expertise in conducting Phase I and Phase II Environmental Site Assessments, which are crucial for real estate transactions and environmental due diligence. G|E|M also provides services such as Spill Prevention, Control, and Countermeasure (SPCC) plans, vapor intrusion assessments, and seismic risk assessments. Their commitment to client satisfaction and adherence to industry standards positions them as a reliable partner for organizations seeking to manage environmental risks effectively.


19. Hey and Associates, Inc.

  • Website: heyassoc.com
  • Ownership type: Private
  • Headquarters: Volo, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1976
  • Headcount: 11-50
  • LinkedIn: hey-and-associates-inc-

Hey and Associates, Inc., established in 1976, is a professional services firm based in Volo, Illinois. The company specializes in engineering, ecological consulting, and landscape architecture, providing comprehensive solutions to intricate water resource and environmental challenges. With a team of engineers, scientists, and landscape architects, they collaborate to design and implement projects that prioritize sustainability and environmental health. Their services include civil engineering, stormwater management, ecological restoration, and landscape design, catering to both municipal governments and private developers. Over the years, Hey and Associates has developed a strong presence in the Midwest, recognized for their expertise in wetland delineation, water quality planning, and green infrastructure. Their commitment to ecological principles and innovative design solutions has made them a respected name in the industry.


20. Mostardi Platt

  • Website: mostardiplatt.com
  • Ownership type: Private Equity
  • Headquarters: Elmhurst, Illinois, United States (USA)
  • Employee distribution: United States (USA) 98%, Other 2%
  • Latest funding: January 2025
  • Founded year: 1976
  • Headcount: 51-200
  • LinkedIn: mostardi-platt-environmental

Mostardi Platt, based in Elmhurst, Illinois, is an environmental consulting firm founded in 1976. The company specializes in air emissions testing, environmental health and safety compliance, and energy development services. With a team of approximately 120 employees, Mostardi Platt has built a reputation for providing comprehensive solutions that help clients meet regulatory standards and improve their environmental practices. They serve a variety of industries, including aerospace, energy, manufacturing, and healthcare, and have expanded their reach internationally, recently adding Chile to their service areas. Their services include environmental assessments, permitting, compliance management, and continuous emissions monitoring, showcasing their commitment to addressing complex environmental challenges. Mostardi Platt's long-standing expertise and focus on tailored solutions make them a significant player in the environmental consulting field.


21. WRD Environmental

  • Website: wrdenvironmental.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 75%, India 25%
  • Founded year: 1997
  • Headcount: 11-50
  • LinkedIn: wrd-environmental

WRD Environmental, based in Chicago, Illinois, is an environmental consulting firm that specializes in green infrastructure, stormwater management, and sustainable design. Since its inception in 1997, the company has focused on helping municipalities, schools, and conservation organizations implement eco-friendly practices. WRD Environmental is known for its innovative engineering solutions that aim to improve environmental quality. The firm has been involved in numerous projects that not only address environmental challenges but also promote community engagement and education. Their work includes transforming urban spaces into sustainable environments, such as the Nature Boardwalk at Lincoln Park Zoo, which serves as both a habitat and an educational resource. WRD Environmental has also partnered with various organizations to enhance biodiversity and promote conservation efforts in the Midwest. With a dedicated team and a commitment to sustainability, WRD Environmental continues to make significant contributions to the field of environmental consulting.


22. Christopher B. Burke Engineering, Ltd.


Christopher B. Burke Engineering, Ltd. (CBBEL), founded in 1986 and based in Rosemont, Illinois, is a consulting engineering and surveying firm with a workforce of approximately 223 employees. The firm specializes in a wide range of services, including civil design, construction management, and notably, environmental consulting. CBBEL has completed over 8,500 environmental resource projects, demonstrating their extensive experience in the field. Their team includes licensed professionals across various disciplines, including environmental studies, which positions them well to tackle complex engineering and environmental challenges. CBBEL's clientele primarily consists of public sector organizations, such as municipalities and counties, who rely on their expertise for effective project execution. Their commitment to sustainability and community involvement is evident in their project portfolio, which includes significant environmental restoration and flood protection initiatives.


23. Environmental Information Logistics


Environmental Information Logistics (EIL) is an environmental consulting and engineering firm based in Glen Ellyn, Illinois. Established in 2010, EIL has carved out a niche in the waste management sector, offering a range of services that include landfill gas design, air permitting, groundwater compliance, and landfill engineering. The firm prides itself on delivering high-quality, economical solutions to the environmental challenges faced by its clients. EIL's team comprises licensed professionals, including civil, geotechnical, and environmental engineers, as well as project managers and scientists, all equipped to tackle the complexities of environmental compliance and engineering. Their approach emphasizes a commitment to client success, ensuring that projects are completed efficiently and effectively. EIL operates nationwide, serving clients from various states, and has built a reputation for reliability and expertise in the environmental consulting field.


24. GSG Consultants, Inc.

  • Website: gsg-consultants.com
  • Ownership type: Private
  • Headquarters: Schaumburg, Illinois, United States (USA)
  • Employee distribution: United States (USA) 99%, Other 1%
  • Founded year: 1992
  • Headcount: 51-200
  • LinkedIn: gsg-consultants-inc-

GSG Consultants, Inc., based in Schaumburg, Illinois, is an engineering consulting firm that has been active since 1992. Initially starting as a small environmental services company, it has grown into a recognized player in the infrastructure engineering and scientific consulting sectors. The firm employs over 100 professionals, specializing in geotechnical, environmental, and construction management services. GSG's environmental offerings include preliminary site assessments, groundwater remediation, and compliance monitoring, catering to a wide array of clients, including government entities and private developers. Their approach emphasizes risk management and cost reduction while ensuring adherence to environmental regulations. GSG has successfully completed thousands of projects, showcasing their capability to handle complex infrastructure challenges while maintaining a focus on environmental protection.


25. Specialty Consulting, Inc.

  • Website: spc-inc.com
  • Ownership type: Corporate
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: January 2013
  • Founded year: 2003
  • Headcount: 51-200
  • LinkedIn: specialty-consulting

Specialty Consulting, Inc. is a Chicago-based consulting firm established in 2003, specializing in environmental engineering, industrial hygiene, structural-architectural engineering, and occupational safety. With a team of over 75 technical professionals, the company provides comprehensive consulting services aimed at managing risks and ensuring compliance with safety and environmental regulations. They serve a variety of clients, including government agencies, land developers, and lending institutions. Their expertise in environmental assessments and remediation positions them as a valuable partner for projects that require careful environmental management. The firm is also recognized as a certified Minority Business Enterprise (MBE) in Illinois, which enhances its profile in the consulting sector. Their focus on sustainability and quality of life reflects a commitment to not only meeting client needs but also promoting a healthier environment for communities.



Environmental Consulting Insights: Key Companies in Illinois


CompanyHeadquarterSizeFoundedOwnership
BBJ GroupChicago, Illinois, United States (USA)51-2001997Private
Weaver Consultants GroupChicago, Illinois, United States (USA)201-5001991Private
RK & Associates, incWarrenville, Illinois, United States (USA)1-101995Private
Jacob & Hefner Associates, Inc.Downers Grove, Illinois, United States (USA)51-2001996Private
TerraCarbon LLCPeoria, Illinois, United States (USA)11-502006Private
Environmental Protection Industries, Inc.South Holland, Illinois, United States (USA)11-501993Private
Aeterra, LLCChicago, Illinois, United States (USA)11-502021Private
Environmental Consulting Group, Inc.Chicago, Illinois, United States (USA)1-101994Private
ImegRock Island, Illinois, United States (USA)1001-50001955Private
ENCAP, Inc.Dekalb, Illinois, United States (USA)11-501973Private
V3 CompaniesWoodridge, Illinois, United States (USA)201-5001983Private
Ricondo & Associates, Inc.Chicago, Illinois, United States (USA)51-2001989Private
Crawford, Murphy & TillySpringfield, Illinois, United States (USA)201-5001946Private
Pizzo & Associates, Ltd.Leland, Illinois, United States (USA)51-2001988Private
Baxter & WoodmanCrystal Lake, Illinois, United States (USA)201-5001946Private
Pioneer Engineering & Environmental Services, LLCChicago, Illinois, United States (USA)11-501989Private
Midwest Environmental Consulting Services, Inc.Yorkville, Illinois, United States (USA)11-501994Private
Green Environmental ManagementCarol Stream, Illinois, United States (USA)11-501991Private
Hey and Associates, Inc.Volo, Illinois, United States (USA)11-501976Private
Mostardi PlattElmhurst, Illinois, United States (USA)51-2001976Private Equity
WRD EnvironmentalChicago, Illinois, United States (USA)11-501997Private
Christopher B. Burke Engineering, Ltd.Rosemont, Illinois, United States (USA)201-5001986Private
Environmental Information LogisticsGlen Ellyn, Illinois, United States (USA)11-502010Private
GSG Consultants, Inc.Schaumburg, Illinois, United States (USA)51-2001992Private
Specialty Consulting, Inc.Chicago, Illinois, United States (USA)51-2002003Corporate


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