Environmental consulting companies in Pennsylvania are pivotal in addressing ecological challenges. They advise on compliance with environmental regulations, pollution management, and sustainable practices. The sector includes firms ranging from large corporations to specialized boutiques, each focused on unique sustainability solutions. With growing awareness of climate change, these companies are expanding services to include renewable energy and waste reduction strategies. Automation and data analytics are becoming critical tools in their work, helping clients optimize resources and minimize risks. As businesses strive for greener operations, the demand for environmental consulting is set to rise significantly in the coming years.

The companies featured in this list vary in size and specialization, headquartered mainly in urban centers like Philadelphia and Pittsburgh. Founded between 1946 and 2015, they range from large firms with over 1,000 employees to smaller entities with specialized expertise. Each organization offers distinct services, including environmental assessments, remediation, and regulatory compliance, ensuring that they meet the evolving demands of industry and government sectors. Collectively, they highlight Pennsylvania’s commitment to addressing pressing environmental challenges through innovative consulting solutions.

Continue reading to discover the top environmental consulting companies in Pennsylvania.

Top 19 Environmental Consulting Companies in Pennsylvania

1. Civil & Environmental Consultants, Inc.

• Website: cecinc.com
• Ownership type: Corporate
• Headquarters: Moon Township, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 97%, Other 3%
• Latest funding: December 2023
• Founded year: 1989
• Headcount: 1001-5000
• LinkedIn: civil-%26-environmental-consultants-inc-

Civil & Environmental Consultants, Inc. (CEC) is an engineering and environmental consulting firm headquartered in Moon Township, Pennsylvania. Established in 1989, the company has grown to employ over 2,000 professionals across 34 offices nationwide. CEC specializes in a variety of services, including air quality assessments, civil engineering, ecological sciences, environmental engineering, and waste management. The firm serves a broad spectrum of industries, including manufacturing, mining, oil & gas, and public sector clients. CEC is committed to providing integrated solutions that align with their clients' business goals while ensuring compliance with environmental regulations. Their employee-owned model fosters a culture of accountability and collaboration, enhancing their ability to deliver effective and timely results. CEC has been recognized in industry rankings, reflecting its significant role in the environmental consulting sector.

2. Weston Solutions, Inc.

• Website: westonsolutions.com
• Ownership type: Private
• Headquarters: West Chester, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 97%, Other 3%
• Founded year: 1957
• Headcount: 1001-5000
• LinkedIn: weston-solutions-inc-

Weston Solutions, Inc. is a private company based in West Chester, Pennsylvania, specializing in environmental and infrastructure services. With a workforce of over 1,400 employees, Weston has been operational since 1957, providing a range of solutions that include remediation, environmental compliance, and infrastructure improvements. The company caters to both government and industrial clients, showcasing its ability to handle complex environmental challenges across various sectors. Their services extend to critical areas such as PFAS remediation, disaster management, and renewable energy solutions. Weston is committed to sustainability and community impact, striving to deliver environmentally responsible outcomes. Their employee-owned model fosters a culture of collaboration and accountability, which is reflected in their project execution and client relationships. Weston Solutions has been recognized as one of the top environmental firms in the country, indicating their significant role in the industry.

3. Pennoni

• Website: pennoni.com
• Ownership type: Corporate
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: January 2015
• Founded year: 1966
• Headcount: 1001-5000
• LinkedIn: pennoni

Pennoni is an engineering consulting firm based in Philadelphia, Pennsylvania, founded in 1966. With a workforce of over 1,200 employees, the company specializes in providing innovative design and technology solutions aimed at improving community infrastructure. They serve a wide range of clients, including government agencies and private developers, tackling challenges related to land development and environmental safety. Pennoni's commitment to high-quality consulting services is evident in their extensive portfolio, which includes projects focused on environmental management and infrastructure improvement. Their recent initiatives, such as the hiring of an Environmental Division Manager, further highlight their dedication to addressing environmental issues. The firm operates across multiple states, maintaining a strong presence in the engineering consulting industry.

4. EHS Support

• Website: ehs-support.com
• Ownership type: Private
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 67%, Australia 25%, New Zealand 4%, Other 4%
• Founded year: 2005
• Headcount: 51-200
• LinkedIn: ehs-support

EHS Support, based in Pittsburgh, Pennsylvania, is a consulting firm that specializes in environmental, health, and safety solutions. Established in 2005, the company has grown to employ between 51 and 200 professionals, with a notable presence in the United States, Australia, and New Zealand. EHS Support offers a wide range of services, including compliance auditing, remediation, risk assessment, and environmental impact assessments. They cater to various sectors, such as manufacturing, oil and gas, and private equity, helping clients manage environmental risks and comply with complex regulations. Their expertise extends to areas like PFAS assessment, Superfund site management, and renewable energy solutions. EHS Support is recognized for its commitment to client success, providing tailored solutions that address specific challenges faced by businesses in today's regulatory environment.

5. All4

• Website: all4inc.com
• Ownership type: Private Equity
• Headquarters: Kimberton, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Latest funding: January 2025
• Founded year: 2002
• Headcount: 201-500
• LinkedIn: all4-inc-

All4, based in Kimberton, Pennsylvania, is an environmental consulting firm that specializes in air quality compliance, water quality management, and health and safety consulting. Since its inception in 2002, All4 has been dedicated to helping businesses navigate the intricate web of environmental regulations. The firm serves a wide range of industries, providing tailored solutions that promote compliance and sustainability. With a team of engineers, scientists, and industry experts, All4 offers a comprehensive suite of services, including air quality modeling, chemical reporting, and waste management. Their proactive approach to environmental governance and commitment to client success has earned them recognition in the industry, including being awarded innovator status in environmental services. All4's focus on education and authentic communication fosters long-term relationships with clients, making them a reliable partner in environmental consulting.

6. McCormick Taylor, Inc.

• Website: mccormicktaylor.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1946
• Headcount: 201-500
• LinkedIn: mccormick-taylor-inc-

McCormick Taylor, Inc., founded in 1946 and based in Philadelphia, Pennsylvania, is a consulting firm that specializes in engineering and planning services. With a workforce of approximately 425 employees, the company provides a wide array of services, including construction, design, environmental studies, and program management. Their clientele primarily consists of government agencies and utility companies, which rely on McCormick Taylor's expertise for infrastructure development and environmental compliance. The firm is particularly noted for its environmental services, which include environmental permitting, studies, and inspections. They have successfully executed projects that focus on stream restoration and compliance with environmental regulations, demonstrating their commitment to enhancing environmental quality. McCormick Taylor's approach integrates technical expertise with a focus on community needs, ensuring that their projects not only meet regulatory requirements but also contribute positively to the environments in which they operate.

7. Sustainable Solutions Corporation

• Website: sustainablesolutionscorporation.com
• Ownership type: Corporate
• Headquarters: Royersford, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 91%, Saudi Arabia 9%
• Latest funding: March 2008
• Founded year: 2001
• Headcount: 11-50
• LinkedIn: sustainable-solutions-corporation

Sustainable Solutions Corporation (SSC), based in Royersford, Pennsylvania, is a sustainability consulting firm founded in 2001. With a team of 11-50 employees, SSC specializes in assisting businesses and organizations in developing and implementing sustainability strategies. Their service portfolio includes sustainability action plans, training programs, and product development aimed at minimizing environmental impact and enhancing operational efficiency. SSC has a strong emphasis on practical solutions, helping clients navigate the complexities of sustainability in a way that aligns with their business objectives. The firm has collaborated with various organizations, including Merck, to support their sustainability initiatives. SSC is also recognized as a certified women-owned business, reflecting their commitment to diversity and inclusion within the industry. They actively engage in community outreach and have established partnerships to further their mission of promoting sustainable practices.

8. TerranearPMC

• Website: terranearpmc.com
• Ownership type: Private
• Headquarters: Exton, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2004
• Headcount: 51-200
• LinkedIn: terranearpmc

TerranearPMC, based in Exton, Pennsylvania, is an environmental consulting and engineering services firm founded in 2004. The company specializes in a range of services including environmental engineering, remediation, waste management, and renewable energy solutions. With a workforce of approximately 66 employees, TerranearPMC has built a reputation for delivering innovative and effective solutions to environmental challenges. They serve a variety of clients, primarily federal, state, and municipal agencies, and have successfully completed numerous projects that emphasize safety and sustainability. Their expertise extends to areas such as radiological services, groundwater treatment, and compliance consulting. The firm has also been recognized for its commitment to safety, achieving over 610,000 man hours without a single OSHA recordable incident in recent years. This dedication to quality and client satisfaction has resulted in a strong portfolio of repeat business and long-term relationships with key clients, including the Department of Energy and the Department of Defense.

9. Urban Engineers

• Website: urbanengineers.com
• Ownership type: Corporate
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 99%
• Latest funding: June 2024
• Founded year: 1960
• Headcount: 201-500
• LinkedIn: urban-engineers-inc-

Urban Engineers, founded in 1960 and based in Philadelphia, Pennsylvania, is an engineering firm that provides a wide array of services, including design, environmental assessments, construction management, and program management. With a workforce of approximately 449 employees, the company serves both government and private sector clients, tackling infrastructure challenges while ensuring adherence to environmental regulations. Urban Engineers has a strong emphasis on sustainability, offering services that include brownfield assessments, NEPA compliance, and flood protection strategies. Their projects often focus on transforming underutilized properties into sustainable community assets, demonstrating their commitment to enhancing the quality of life through responsible engineering practices. The firm also operates the Urban Training Institute, which provides professional development and training in various engineering and environmental topics, further solidifying their role in the industry.

10. Bluestone Environmental Group, Inc.

• Website: bluestoneenviro.com
• Ownership type: Private
• Headquarters: Malvern, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2010
• Headcount: 51-200
• LinkedIn: bluestone-environmental-group-inc.

Bluestone Environmental Group, Inc. is an environmental consulting and engineering firm based in Malvern, Pennsylvania. Established in 2010, the company specializes in compliance, risk assessments, and remediation services. With a workforce of approximately 60 employees, Bluestone operates across multiple locations in the Northeast, including offices in Massachusetts and Maryland. The firm has a strong focus on serving both public and private sectors, providing customized solutions to manage environmental challenges. Bluestone has successfully completed over 350 projects for more than 100 clients, showcasing their extensive experience in the industry. Notable clients include NASA and various branches of the Department of Defense, reflecting their capability to handle complex federal and state projects. The company is recognized for its expertise in environmental compliance, permitting, and regulatory reporting, and it maintains strategic alliances with subcontractors to meet project demands effectively.

11. Liberty Environmental

• Website: libertyenviro.com
• Ownership type: Private
• Headquarters: Reading, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2004
• Headcount: 11-50
• LinkedIn: liberty-environmental-inc.

Liberty Environmental is an environmental consulting and engineering firm based in Reading, Pennsylvania, with additional offices in Lancaster, Philadelphia, New York City, and Lebanon, New Jersey. Established in 2004, the company has built a reputation for providing a wide array of services that assist businesses and government agencies in managing their environmental responsibilities. Their expertise spans regulatory compliance, air quality management, wastewater treatment design, site assessment and remediation, and energy efficiency, among others. Liberty Environmental prides itself on understanding the unique needs of its clients and delivering innovative solutions to complex environmental problems. The firm actively engages with current environmental regulations and trends, ensuring that their clients remain compliant and informed. With a dedicated team of professionals, Liberty Environmental continues to contribute significantly to the environmental consulting industry, helping clients navigate the intricacies of environmental management.

12. Penn E&R

• Website: penn-er.com
• Ownership type: Private
• Headquarters: Doylestown, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1996
• Headcount: 51-200
• LinkedIn: penn-e-%26-r

Penn Environmental & Remediation, Inc. (Penn E&R) is a consulting firm based in Doylestown, Pennsylvania, specializing in environmental, engineering, and construction services. Founded in 1996, the company has built a reputation for delivering a wide range of services, including environmental assessments, remediation, civil engineering, and ecological services. Penn E&R caters to various sectors such as construction, utilities, mining, and renewable energy, demonstrating their capability to address diverse client needs. Their mission emphasizes providing reliable and cost-effective solutions while maintaining a strong focus on safety and environmental soundness. The firm employs a team of experienced professionals, including engineers, geologists, and environmental scientists, who work collaboratively to ensure projects are completed on time and within budget. With a commitment to quality and compliance with regulatory requirements, Penn E&R has successfully completed numerous projects, reinforcing their position in the environmental consulting industry.

13. LandStudies, Inc.

• Website: landstudies.com
• Ownership type: Private
• Headquarters: Lititz, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1989
• Headcount: 11-50
• LinkedIn: landstudies

LandStudies, Inc. is an environmental consulting and engineering firm based in Lititz, Pennsylvania, established in 1989. With a team of 44 employees, the company specializes in water management solutions, watershed planning, and landscape architecture. They provide a range of services aimed at helping municipalities and organizations navigate environmental challenges and ensure regulatory compliance. Their expertise includes MS4 permit services, floodplain restoration, and ecological construction, which are critical in managing water resources and enhancing ecological health. LandStudies has pioneered innovative approaches to watershed planning, notably through their comprehensive programs that integrate community engagement and long-term sustainability. Their commitment to education is evident in their offerings of online courses and publications, which aim to inform and empower stakeholders in environmental stewardship. The firm is also recognized for its certifications and licenses, reinforcing its credibility in the environmental consulting sector.

14. Borton-Lawson, a Verdantas Company

• Website: borton-lawson.com
• Ownership type: Corporate
• Headquarters: Wilkes-Barre, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: January 2023
• Founded year: 1988
• Headcount: 51-200
• LinkedIn: borton-lawson

Borton-Lawson, a Verdantas Company, is a professional services firm based in Wilkes-Barre, Pennsylvania, founded in 1988. The company specializes in engineering and environmental science, offering innovative solutions across various sectors, including government and renewable energy. Their services include environmental assessments, engineering design, and integrated technology solutions, which help clients navigate complex challenges while promoting sustainability. Borton-Lawson prioritizes human health and environmental preservation, working closely with clients to develop practical solutions that meet regulatory standards. Their expertise spans multiple areas, including environmental health and safety, geotechnical engineering, and natural resources planning. This multifaceted approach positions them as a significant player in the environmental consulting industry, contributing to projects that enhance community resilience and environmental quality.

15. Key Environmental Inc.

• Website: keyenvir.com
• Ownership type: Private
• Headquarters: Carnegie, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1995
• Headcount: 51-200
• LinkedIn: key-environmental-inc.

Key Environmental Inc., based in Carnegie, Pennsylvania, has been a player in the environmental consulting field since its inception in 1995. The company specializes in environmental compliance, remediation, and engineering projects, catering to a variety of industries. With a workforce of around 49 employees, Key Environmental has successfully completed over 350 projects, demonstrating their expertise in navigating complex regulatory landscapes. Their services include site assessments, civil engineering, environmental permitting, and construction management. Notably, they have developed innovative solutions for Coal Combustion Residuals (CCR) remediation and have gained recognition for their work on emerging contaminants. Their commitment to safety and cost-effective solutions is evident in their operational practices and project outcomes.

16. Stell

• Website: stellee.com
• Ownership type: Private
• Headquarters: Bethlehem, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 93%, United Kingdom (UK) 7%
• Founded year: 2004
• Headcount: 51-200
• LinkedIn: stell-environmental-enterprises-inc.

Stell, founded in 2004 and based in Bethlehem, Pennsylvania, is a private consulting firm with a workforce of approximately 102 employees. The company specializes in environmental planning, asset management, and technology integration, providing essential services to both businesses and government entities. Stell's expertise lies in navigating complex regulatory landscapes and implementing sustainable practices that align with organizational goals. Their offerings include environmental assessments, compliance guidance, and strategic planning aimed at fostering community engagement and environmental stewardship. Stell's mission emphasizes improving the quality of life for current and future generations by advancing a healthy and sustainable planet. With a strong presence in the United States and a growing footprint in the United Kingdom, Stell continues to play a significant role in the environmental consulting industry.

17. Quad Three Group, Inc.

• Website: quad3.com
• Ownership type: Private
• Headquarters: Wilkes-Barre, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1988
• Headcount: 51-200
• LinkedIn: quad3-group-inc-

Quad Three Group, Inc., based in Wilkes-Barre, Pennsylvania, is a professional services firm founded in 1988. With a workforce of 51-200 employees, the company specializes in architecture, engineering, and environmental consulting. Quad Three is dedicated to providing comprehensive solutions tailored to the needs of various sectors, including government and private industries. Their environmental consulting services cover a wide array of areas such as compliance, due diligence, permitting, and risk management. The firm emphasizes sustainable design and regulatory compliance, ensuring that their projects not only meet client expectations but also adhere to environmental standards. Their multidisciplinary team integrates environmental experts with architects and engineers, fostering a collaborative approach to project planning and execution. This synergy allows them to deliver high-quality, environmentally conscious solutions that address the pressing challenges of today.

18. 3R Sustainability

• Website: 3rsustainability.com
• Ownership type: Private
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 93%, United Kingdom (UK) 7%
• Founded year: 2015
• Headcount: 11-50
• LinkedIn: 3r-building-sustainability

3R Sustainability, based in Pittsburgh, Pennsylvania, is a private consulting firm founded in 2015. With a team of approximately 43 employees, the company specializes in sustainability practices, offering services that include environmental consulting, climate scenario analysis, and sustainability reporting. Their mission is to assist businesses and organizations in minimizing their environmental impact while enhancing corporate responsibility. 3R has been recognized as a certified B Corporation since 2019, placing them among companies that meet high standards of social and environmental performance. They are also noted for their involvement in various industry organizations, such as the U.S. Green Building Council and the Green Sports Alliance, which underscores their commitment to promoting sustainable practices across different sectors. Their focus on practical solutions, such as energy modeling and product life cycle assessments, further demonstrates their active role in the environmental consulting field.

19. CME Engineering

• Website: cmemgmt.com
• Ownership type: Private
• Headquarters: Greensburg, Pennsylvania, United States (USA)
• Founded year: 1999
• Headcount: 51-200
• LinkedIn: cme-management-llc

CME Engineering, based in Greensburg, Pennsylvania, is a private consulting firm established in 1999. The company specializes in environmental engineering and compliance services, offering a broad spectrum of solutions that include water management, environmental assessments, and health and safety consulting. CME Engineering serves a variety of clients, including public agencies and private businesses across multiple sectors such as energy, healthcare, and manufacturing. Their expertise helps clients navigate complex regulatory landscapes and implement sustainable practices, making them a valuable partner in environmental management. The firm is recognized for its technical proficiency and commitment to quality, which are essential in addressing the pressing environmental challenges of today.

Environmental Consulting Insights: Key Companies in Pennsylvania

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