Geotechnical engineering companies in Illinois are pivotal for infrastructure and construction projects. They evaluate soil conditions, ensuring stability and safety for buildings, roads, and bridges. These firms offer vital services, such as subsurface investigations, materials testing, and environmental assessments, addressing both public sector needs and private development projects. As the demand for sustainable construction grows, these companies are increasingly focusing on innovative practices and regulatory compliance. With advancements in technology and enhanced data analysis, the future promises to streamline operations, improving accuracy and efficiency throughout the engineering process.

This listing features a selection of 19 geotechnical engineering companies in Illinois, reflecting various sizes from small firms to large organizations. Founded between 1952 and 2011, these companies have established headquarters throughout the state, with specialties ranging from materials testing to environmental consulting. Notably, firms such as Geo Services, Inc. and GSG Consultants, Inc. are recognized not only for their engineering expertise but also for having substantial client bases across sectors.

Read on to discover more about the top geotechnical engineering companies in Illinois.

Top 19 Geotechnical Engineering Companies in Illinois

1. Geo Services, Inc.

• Website: geoservicesinc.net
• Ownership type: Private
• Headquarters: Naperville, Illinois, United States (USA)
• Employee distribution: United States (USA) 81%, Pakistan 19%
• Founded year: 2000
• Headcount: 11-50
• LinkedIn: geo-services-inc.

Geo Services, Inc. is a civil engineering firm based in Naperville, Illinois, specializing in geotechnical, environmental, and construction engineering services. Established in 2000, the company has built a reputation for delivering quality solutions to both public organizations and private sector clients. With a dedicated team of professionals, including licensed engineers and certified inspectors, Geo Services, Inc. has successfully completed thousands of projects across Illinois. Their service offerings include geotechnical engineering, foundation design, environmental site assessments, and materials testing, among others. The firm operates its own drilling equipment, ensuring control over the quality and efficiency of their services. As a certified Minority and Disadvantaged Business Enterprise (MBE/DBE), they are positioned to compete effectively in a variety of projects, particularly those that prioritize diversity in contracting. Their commitment to project safety and compliance is evident in their operational practices and client interactions.

2. 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. is an engineering consulting firm based in Schaumburg, Illinois, established in 1992. The company specializes in geotechnical engineering, environmental services, and construction management, catering to a wide range of clients, including government agencies and private developers. With a workforce of approximately 149 employees, GSG has developed a reputation for delivering reliable and high-quality services in infrastructure projects. Their expertise includes subsurface exploration, foundation design, soil stabilization, and construction monitoring, among other geotechnical services. GSG is also recognized for its commitment to environmental compliance and safety, ensuring that projects meet regulatory standards. The firm has successfully completed thousands of projects, showcasing its capability to manage both large and small-scale initiatives. GSG's mission emphasizes risk management and cost reduction while prioritizing human health and environmental protection, reflecting their dedication to sustainable practices in engineering.

3. Wang Engineering, Inc.

• Website: wangeng.com
• Ownership type: Corporate
• Headquarters: Lombard, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: February 2022
• Founded year: 1982
• Headcount: 11-50
• LinkedIn: wang-engineering-inc.

Wang Engineering, Inc., based in Lombard, Illinois, is an engineering firm that specializes in geotechnical engineering, construction inspection, and materials testing. Established in 1982, the company has successfully completed over 5,200 projects, serving both government and private sector clients. Their services include subsurface investigations, foundation design, and quality assurance programs, among others. Wang Engineering operates a state-of-the-art testing laboratory accredited by the AASHTO Accreditation Program, ensuring high standards in soil, aggregate, concrete, and asphalt testing. In 2022, they became a subsidiary of Terracon, which enhances their capabilities by providing access to a nationwide network of resources. This partnership allows them to leverage local geotechnical data while offering comprehensive solutions to their clients. Wang Engineering is prequalified to perform geotechnical services for several state transportation departments, further solidifying their position in the industry.

4. Andrews Engineering, Inc.

• Website: andrews-eng.com
• Ownership type: Private
• Headquarters: Springfield, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1974
• Headcount: 51-200
• LinkedIn: andrews-engineering-inc-

Andrews Engineering, Inc. is a private engineering firm based in Springfield, Illinois, with additional locations in Chicago, Indianapolis, St. Louis, and Pontiac. Founded in 1974, the company has built a solid reputation for providing a wide array of engineering services, including construction, environmental consulting, and notably, geotechnical engineering. Their geotechnical services focus on essential tasks such as structural foundations, soil sampling, subsurface investigations, and geotechnical hazards identification. The firm serves both businesses and government entities, helping them navigate complex engineering challenges while ensuring compliance with relevant regulations. With a workforce of approximately 49 employees, Andrews Engineering is well-equipped to manage various project needs across its operational regions, demonstrating a commitment to quality and client satisfaction.

5. Testing Service Corporation

• Website: tsccorp.com
• Ownership type: Private
• Headquarters: Carol Stream, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1954
• Headcount: 51-200
• LinkedIn: testing-service-corporation

Testing Service Corporation, based in Carol Stream, Illinois, is an engineering firm that has been operational since 1954. The company specializes in geotechnical engineering, construction materials testing, and environmental consulting. With a workforce of 51-200 employees, TSC has built a reputation for providing essential assessments and testing services that ensure project compliance and safety. They cater to a variety of clients, including builders, developers, and government agencies, demonstrating their capability to handle projects of different scales and complexities. TSC operates multiple locations across Illinois, which allows them to maintain strong client relationships and deliver timely services. Their extensive experience in the industry is complemented by a commitment to quality and reliability, making them a trusted partner for various construction and environmental projects.

6. 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 specializing in engineering services. With a workforce of approximately 357 employees, the company provides a broad spectrum of solutions in solid waste management, environmental services, and civil survey geotechnical services. Their expertise in geotechnical engineering is evident through their offerings, which include civil engineering and design, geospatial land surveying, and construction materials testing. Weaver Consultants Group serves a wide array of clients, from small businesses to large corporations, helping them navigate regulatory compliance and environmental challenges. Their commitment to quality and client satisfaction has established them as a reliable partner in the industry, making them a notable player in the geotechnical engineering sector.

7. Seeco Consultants, INC.

• Website: seeco.com
• Ownership type: Private Equity
• Headquarters: Tinley Park, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: March 2022
• Founded year: 1970
• Headcount: 11-50
• LinkedIn: seeco-consultants-inc.

Seeco Consultants, INC. is a consulting engineering firm based in Tinley Park, Illinois, specializing in civil, geotechnical, and structural engineering, as well as environmental and construction services. Established in 1970, the company has been providing comprehensive engineering solutions to industrial clients, developers, and government agencies across the Midwest. Seeco's expertise includes environmental investigations, remediation design, and construction materials testing. The firm operates a geotechnical and materials testing laboratory that is approved by the U.S. Army Corps of Engineers and various state departments, ensuring high standards in their testing and analysis. Their team consists of experienced engineers, scientists, and technicians, all dedicated to delivering dependable service and ensuring project success. Seeco's commitment to regulatory compliance and quality control is evident in their multi-tiered review system for project reports, which includes oversight by licensed professional engineers.

8. INTERRA, Inc.

• Website: interraservices.com
• Ownership type: Private
• Headquarters: Bolingbrook, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1996
• Headcount: 51-200
• LinkedIn: interra-services

INTERRA, Inc. is an engineering firm based in Bolingbrook, Illinois, specializing in engineering, inspection, and testing services. Established in 1996, the company has built a reputation for providing reliable solutions for construction and environmental projects. INTERRA offers a range of services, including geotechnical engineering, materials testing, and construction management. They serve a variety of clients, from state highway departments to Fortune 500 companies, demonstrating their capability to handle projects of different scales and complexities. The firm is prequalified by the Illinois and Wisconsin Departments of Transportation, which underscores their compliance with industry standards. INTERRA has received several accolades for its performance, including the 2020 HACIA DBE Professional Services Firm of the Year award, reflecting their commitment to quality and client satisfaction. With multiple offices in Illinois and Wisconsin, INTERRA is well-positioned to support projects across the Midwest.

9. Team Services

• Website: teamservices.com
• Ownership type: Private
• Headquarters: Carol Stream, Illinois, United States (USA)
• Founded year: 1976
• Headcount: 201-500
• LinkedIn: team-services

Team Services, Inc., based in Carol Stream, Illinois, has been a significant player in the engineering and scientific services sector since its inception in 1976. The company specializes in geotechnical services, testing, and special inspections, catering to a wide range of clients including owners, designers, and contractors in the construction industry. With a workforce of approximately 201-500 employees, Team Services emphasizes quality assurance and compliance solutions, ensuring that projects meet necessary standards and regulations. Their expertise spans subsurface exploration, deep foundation analysis, pavement design, and various laboratory testing services. The firm is recognized for its commitment to high-quality service, quick turnaround times for results, and a proactive approach to client communication. Team Services operates multiple branch offices across Iowa and Nebraska, enhancing their reach and service capabilities. Their rigorous quality control measures and accreditations underscore their dedication to maintaining industry standards.

10. SKS Engineers, LLC

• Website: sksengineers.com
• Ownership type: Private
• Headquarters: Decatur, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2011
• Headcount: 11-50
• LinkedIn: sks-engineers-llc

SKS Engineers, LLC, based in Decatur, Illinois, is a private engineering firm established in 2011. The company specializes in a wide array of engineering services, including civil, structural, and notably, geotechnical engineering. With a team of licensed professionals, SKS Engineers has been serving clients in central Illinois and beyond for over 50 years. Their expertise includes conducting geotechnical investigations, providing recommendations for foundation designs, and performing soil stabilization. The firm has worked with various clients, including contractors, government agencies, and educational institutions, demonstrating their ability to manage projects of different scales. SKS Engineers is also prequalified with the Illinois Department of Transportation, which adds to their credibility in the industry. Their commitment to quality and compliance is evident in their operational practices, making them a reliable partner in engineering projects.

11. Wiss, Janney, Elstner Associates, Inc.

• Website: wje.com
• Ownership type: Private
• Headquarters: Northbrook, Illinois, United States (USA)
• Employee distribution: United States (USA) 99%
• Founded year: 1956
• Headcount: 501-1000
• LinkedIn: wiss-janney-elstner-associates-inc-

Wiss, Janney, Elstner Associates, Inc. (WJE) is a professional services firm based in Northbrook, Illinois, specializing in engineering, architecture, and materials science. Founded in 1956, WJE has built a reputation for providing expert consultation and innovative solutions to complex challenges in the built environment. The firm operates through a network of offices across the United States and has a workforce of approximately 897 employees. WJE offers a wide array of services, including structural engineering, forensic analysis, materials testing, and notably, geotechnical and geological engineering. Their interdisciplinary team applies technical expertise to a variety of projects, having investigated and innovated on over 175,000 assignments. WJE is committed to sustainability and employs advanced laboratory and field testing capabilities to address issues related to structures and construction materials. Their approach is hands-on and empirical, ensuring that they deliver practical solutions tailored to client needs.

12. Millennia Professional Services

• Website: millennia.pro
• Ownership type: Private
• Headquarters: Morton, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2004
• Headcount: 51-200
• LinkedIn: millennia-professional-services

Millennia Professional Services, founded in 2004 and based in Morton, Illinois, is a private engineering firm that provides a broad spectrum of professional engineering and consulting services. With a workforce of approximately 62 employees, the company serves both public and private sector clients, focusing on enhancing infrastructure through effective project management and engineering solutions. Their expertise spans several engineering disciplines, prominently featuring civil, geotechnical, and transportation engineering. Millennia's geotechnical engineering services include planning subsurface exploration programs, conducting geotechnical laboratory testing, and providing design studies for various foundation systems. The firm has received recognition for its quality work, evidenced by several awards, including the ACEC Engineering Excellence Award. Millennia is committed to delivering high-quality service and fostering strong client relationships, which positions them as a relevant player in the geotechnical engineering industry.

13. Midland Standard Engineering & Testing, Inc.

• Website: msetinc.com
• Ownership type: Private
• Headquarters: South Elgin, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2005
• Headcount: 11-50
• LinkedIn: midland-standard-engineering-%26-testing-inc.

Midland Standard Engineering & Testing, Inc. is a private engineering firm based in South Elgin, Illinois, specializing in geotechnical engineering and construction materials testing. Established in 2005, the company has built a reputation for providing comprehensive services that include site exploration, laboratory testing, and quality assurance for various construction projects. Their expertise covers a wide range of geotechnical engineering tasks, such as monitoring site exploration programs, conducting laboratory tests, and offering design recommendations for buildings, roadways, and other structures. The firm is staffed by licensed professional engineers and certified technicians, ensuring high standards in their operations. Midland Standard serves a diverse clientele, including construction firms and governmental agencies across Illinois, Wisconsin, and Indiana, contributing to the safety and compliance of numerous construction endeavors. Their laboratory is accredited and equipped to handle various testing needs, further solidifying their role in the industry.

14. Chamlin & Associates

• Website: chamlin.com
• Ownership type: Private
• Headquarters: Peru, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1952
• Headcount: 51-200
• LinkedIn: chamlin-%26-associates-inc.

Chamlin & Associates, Inc. is an engineering and consulting firm based in Peru, Illinois, with additional offices in Morris, Ottawa, and Morton. Founded in 1952, the company has built a solid reputation in civil engineering, land surveying, and environmental consulting. They cater to a variety of clients, including municipalities, commercial developers, and industrial entities, assisting with infrastructure projects and ensuring regulatory compliance. Chamlin & Associates has a dedicated team of professionals, including registered engineers and land surveyors, who bring decades of experience to their projects. Their geotechnical engineering services include essential functions such as foundation design, slope stability analysis, and soil classification for septic systems. The firm operates a materials lab that conducts various soil tests, further enhancing their capabilities in geotechnical engineering. With a focus on quality and client satisfaction, Chamlin & Associates has successfully managed numerous projects, contributing to the development and improvement of infrastructure in central Illinois.

15. Pioneer Engineering & Environmental Services, LLC

• Website: pioneerees.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 91%, India 9%
• Founded year: 1989
• Headcount: 11-50
• LinkedIn: pioneer-engineering-and-environmental-services-llc

Pioneer Engineering & Environmental Services, LLC, based in Chicago, Illinois, is a consulting firm that specializes in environmental assessments and engineering services. Founded in 1989, the company has built a reputation for providing comprehensive services to businesses and organizations in the real estate and construction sectors. Their service portfolio includes site assessments, remediation, and notably, geotechnical engineering. Pioneer plays a crucial role in helping clients understand and mitigate risks associated with contaminated properties, ensuring compliance with environmental regulations. With a team of experienced professionals, they have successfully completed thousands of projects, demonstrating their expertise in addressing complex environmental challenges. The firm is recognized for its responsiveness and commitment to quality, making it a trusted partner in the industry.

16. Material Service Testing, Inc.

• Website: materialservicetesting.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: material-service-testing-inc

Material Service Testing, Inc. (MST) is a construction materials testing and engineering consulting company based in Chicago, Illinois. Founded in 2009, MST specializes in a wide array of services that include pre-construction consulting, materials engineering, inspection, and laboratory testing. They cater to both public and private clients, ensuring that projects meet stringent quality standards. MST is recognized as a Minority Business Enterprise (MBE) and a Disadvantaged Business Enterprise (DBE), which highlights their commitment to inclusivity in the industry. The firm maintains a fully equipped laboratory accredited by the U.S. Army Corps of Engineers and the Illinois Department of Transportation (IDOT), among others. Their team consists of skilled technicians who are certified in various testing methods, ensuring high-quality service delivery. MST has been involved in numerous significant projects, particularly with IDOT, showcasing their expertise in geotechnical services and construction materials testing.

17. Engineering and Research International, Inc.

• Website: eriusa.com
• Ownership type: Private
• Headquarters: Savoy, Illinois, United States (USA)
• Employee distribution: Saudi Arabia 84%, United Arab Emirates 14%, Lebanon 2%
• Founded year: 1982
• Headcount: 11-50
• LinkedIn: engineering-and-research-international-inc

Engineering and Research International, Inc. (ERI), founded in 1982 and based in Savoy, Illinois, is a private engineering firm that specializes in pavement, geotechnical, and materials engineering. With a workforce of approximately 43 employees, ERI provides a comprehensive range of services that include pavement management, evaluation, rehabilitation, and construction material testing. The company has established a solid reputation for its expertise in geotechnical engineering, offering services such as soil and aggregate testing, foundation inspections, and laboratory analysis. ERI's clientele spans government agencies, universities, and private organizations, reflecting their capability to handle a variety of infrastructure projects. Notably, a significant portion of their operations is conducted internationally, with 84% of their workforce located in Saudi Arabia, indicating their involvement in large-scale projects in the region. ERI's commitment to research and development in pavement and geotechnical engineering further underscores their active role in advancing industry standards and practices.

18. Stalworth Underground

• Website: stalworthunderground.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2012
• Headcount: 51-200
• LinkedIn: stalworth-underground

Stalworth Underground LLC, based in Chicago, Illinois, is a construction contractor that specializes in deep foundation and earth retention services. Founded in 2012, the company has established itself as a significant player in the construction industry, particularly in the Chicago area. Stalworth Underground provides essential engineering solutions that ensure the stability of structures in challenging soil conditions. Their expertise extends to value engineering and marine work, allowing them to cater to a variety of construction projects. The company employs a team of seasoned professionals and utilizes advanced technology and equipment to deliver high-quality results. With a focus on safety and efficiency, Stalworth Underground has successfully completed numerous projects, including high-rise buildings and infrastructure improvements, demonstrating their capability in handling complex geotechnical challenges.

19. Benesch

• Website: benesch.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1946
• Headcount: 501-1000
• LinkedIn: alfred-benesch-%26-company

Benesch is an engineering and consulting firm based in Chicago, Illinois, founded in 1946. The company specializes in infrastructure improvement and community development, providing a wide array of services that include engineering, environmental consulting, and project management. With a workforce of over 1,100 employees, Benesch serves both public and private sector clients, helping them navigate regulatory challenges and implement sustainable solutions for various infrastructure projects. Their practice areas cover transportation, community planning, and environmental services, with a notable emphasis on geotechnical engineering. Benesch's multidisciplinary team collaborates to address complex challenges, ensuring that projects are executed efficiently and effectively. Their commitment to quality and community engagement is evident in their project portfolio, which includes significant infrastructure developments across the United States.

Geotechnical Engineering Insights: Key Companies in Illinois

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