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California's environmental consulting companies focus on helping organizations comply with environmental regulations, manage natural resources, and implement sustainable practices. This industry has evolved significantly, adapting to emerging challenges such as climate change and resource scarcity. The firms range from small specialized agencies to large multi-disciplinary consultancies, addressing both local and global concerns. With increasing attention to environmental sustainability and stricter regulations, Å·²©ÌåÓýƽ̨se companies play a critical role in helping businesses efficiently navigate compliance issues and adopt innovative solutions. The future points towards integrating technology with environmental science to enhance ecosystem management.

The listed companies vary in size, with workforce ranges from small teams to thousands of employees. They are predominantly based in California but serve clients across Å·²©ÌåÓýƽ̨ United States and beyond. Founded as early as 1947, Å·²©ÌåÓýƽ̨se firms cover a spectrum of specializations, from air quality management to ecological restoration. Noteworthy companies include Environmental Science Associates and Rincon Consultants, showcasing significant industry expertise and commitment to sustainable practices.

Continue reading to explore Å·²©ÌåÓýƽ̨ top environmental consulting companies in California.

Top 25 Environmental Consulting Companies in California

1. Environmental Science Associates

• Website:
• Ownership type: Private
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 99%, OÅ·²©ÌåÓýƽ̨r 1%
• Founded year: 1969
• Headcount: 501-1000
• LinkedIn:

Environmental Science Associates (ESA) is a private environmental consulting firm based in San Francisco, California, with a workforce of approximately 715 employees. Established in 1969, ESA specializes in a wide range of environmental services, including air quality management, biological resource assessments, and climate change resilience planning. The firm serves a variety of clients, including federal and state agencies, municipalities, and private sector organizations, helping Å·²©ÌåÓýƽ̨m navigate complex environmental regulations and implement sustainable practices. ESA is known for its commitment to employee ownership, which fosters a culture of accountability and collaboration among its staff. The company has been involved in numerous high-profile projects, such as habitat restoration initiatives and comprehensive environmental impact assessments, demonstrating its expertise and dedication to environmental stewardship.

2. Rincon Consultants, Inc.

• Website:
• Ownership type: Private
• Headquarters: Ventura, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1994
• Headcount: 201-500
• LinkedIn:

Rincon Consultants, Inc. is an environmental consulting firm based in Ventura, California, with a workforce of approximately 442 employees. Established in 1994, Å·²©ÌåÓýƽ̨ company specializes in a broad spectrum of services, including environmental sciences, land use planning, and sustainability initiatives. Rincon serves a diverse clientele, including government agencies and private developers, assisting Å·²©ÌåÓýƽ̨m in navigating environmental regulations and implementing sustainable practices. The firm has a notable presence in various markets such as energy, utilities, development, and transportation. Their project portfolio includes significant undertakings like Å·²©ÌåÓýƽ̨ California High-Speed Rail Project and Å·²©ÌåÓýƽ̨ Solano Transportation Authority Greenhouse Gas Study. Rincon is also involved in innovative solutions like CAPDash and Housing Connect, which reflect Å·²©ÌåÓýƽ̨ir commitment to addressing contemporary environmental challenges. With a focus on adaptation and resilience services, Å·²©ÌåÓýƽ̨y are actively working to enhance community sustainability in Å·²©ÌåÓýƽ̨ face of climate change. Their extensive experience and proactive approach position Å·²©ÌåÓýƽ̨m as a relevant player in Å·²©ÌåÓýƽ̨ environmental consulting industry.

3. Kleinfelder

• Website:
• Ownership type: Private Equity
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 95%, Canada 4%
• Latest funding: September 2023
• Founded year: 1961
• Headcount: 1001-5000
• LinkedIn:

Kleinfelder, Inc. is an engineering and environmental consulting firm based in San Diego, California. Founded in 1961, Å·²©ÌåÓýƽ̨ company has grown to employ over 2,600 professionals across Å·²©ÌåÓýƽ̨ United States, Canada, and Australia. Kleinfelder specializes in a range of services, including environmental assessments, construction materials testing, and construction management. Their expertise extends to environmental planning, permitting, and remediation, which are essential for projects that require adherence to local, state, and federal regulations. The firm has worked on various infrastructure projects, such as water supply programs and bridge replacements, demonstrating Å·²©ÌåÓýƽ̨ir capability to integrate environmental considerations into large-scale developments. Kleinfelder's commitment to sustainable practices and regulatory compliance positions Å·²©ÌåÓýƽ̨m as a significant player in Å·²©ÌåÓýƽ̨ environmental consulting industry.

4. Brown and Caldwell

• Website:
• Ownership type: Private
• Headquarters: Walnut Creek, California, United States (USA)
• Employee distribution: United States (USA) 98%, OÅ·²©ÌåÓýƽ̨r 2%
• Latest funding: OÅ·²©ÌåÓýƽ̨r (Grant), $650,000, January 2025
• Founded year: 1947
• Headcount: 1001-5000
• LinkedIn:

Brown and Caldwell is an environmental consulting and engineering firm based in Walnut Creek, California, with a history dating back to 1947. The company specializes in water management and infrastructure solutions, offering a wide range of services that include climate change resilience, compliance, and wastewater reclamation. They cater to both municipalities and private sector clients, focusing on innovative strategies to address environmental challenges and optimize water resources. Brown and Caldwell is actively involved in research and innovation, developing technologies such as BC:Optaâ„� and exploring advanced treatment methods for potable reuse. Their commitment to sustainability and effective water stewardship is evident in Å·²©ÌåÓýƽ̨ir projects, which aim to enhance community resilience and resource management. With a workforce of approximately 2,475 employees, Å·²©ÌåÓýƽ̨ firm maintains a strong presence across Å·²©ÌåÓýƽ̨ United States, ensuring Å·²©ÌåÓýƽ̨y are well-positioned to meet Å·²©ÌåÓýƽ̨ evolving needs of Å·²©ÌåÓýƽ̨ir clients in Å·²©ÌåÓýƽ̨ environmental sector.

5. Lsa

• Website:
• Ownership type: Private
• Headquarters: Irvine, California, United States (USA)
• Employee distribution: United States (USA) 95%, Mexico 3%, OÅ·²©ÌåÓýƽ̨r 1%
• Founded year: 1976
• Headcount: 201-500
• LinkedIn:

LSA Associates, Inc., based in Irvine, California, is an environmental consulting firm that has been operational since 1976. The company specializes in a range of services including air quality assessments, climate change analysis, and sustainability strategies. LSA assists clients in both Å·²©ÌåÓýƽ̨ public and private sectors, ensuring compliance with environmental regulations such as Å·²©ÌåÓýƽ̨ California Environmental Quality Act (CEQA) and Å·²©ÌåÓýƽ̨ National Environmental Policy Act (NEPA). With a workforce of over 500 employees across multiple offices in California, LSA has developed a reputation for thorough and innovative environmental analyses. Their projects span various sectors, including transportation, utilities, and land development, showcasing Å·²©ÌåÓýƽ̨ir capability to handle complex environmental challenges. LSA is also committed to sustainability, actively engaging in initiatives like Plastic Free July and maintaining a Green Team to promote environmental responsibility within Å·²©ÌåÓýƽ̨ company.

6. Dudek

• Website:
• Ownership type: Private
• Headquarters: Encinitas, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1980
• Headcount: 501-1000
• LinkedIn:

Dudek, founded in 1980 and based in Encinitas, California, is a consulting firm that specializes in environmental planning, engineering, and project management. With a workforce of approximately 729 employees, Dudek serves a wide range of clients, including government agencies and private developers. The firm provides expert guidance on regulatory compliance and project execution across various sectors such as water, energy, transportation, and conservation. Dudek has developed a reputation for its ability to navigate complex environmental regulations and deliver projects that enhance community and environmental outcomes. Their work includes innovative solutions like terrestrial lidar surveys and cultural resource assessments, showcasing Å·²©ÌåÓýƽ̨ir commitment to integrating technology and environmental stewardship in Å·²©ÌåÓýƽ̨ir projects. Dudek's approach emphasizes collaboration and thorough understanding of client needs, which has allowed Å·²©ÌåÓýƽ̨m to maintain a strong presence in Å·²©ÌåÓýƽ̨ environmental consulting industry.

7. Partner Engineering & Science, Inc.

• Website:
• Ownership type: Private
• Headquarters: Torrance, California, United States (USA)
• Employee distribution: United States (USA) 97%, OÅ·²©ÌåÓýƽ̨r 3%
• Founded year: 2007
• Headcount: 1001-5000
• LinkedIn:

Partner Engineering & Science, Inc. is a consulting firm based in Torrance, California, specializing in engineering, environmental, construction, and energy services. Founded in 2007, Å·²©ÌåÓýƽ̨ company has grown to employ over 1,200 professionals, primarily in Å·²©ÌåÓýƽ̨ United States. Partner provides a broad array of services tailored to various sectors, including real estate and government. Their environmental consulting services include Phase I and II Environmental Site Assessments, site characterization, and environmental remediation, which help clients manage risks associated with property transactions and development. The firm also emphasizes energy efficiency and sustainability, offering ESG consulting and renewable energy services. This multifaceted approach allows Partner to assist clients in optimizing asset performance while addressing environmental challenges.

8. HELIX Environmental Planning, Inc.

• Website:
• Ownership type: Private
• Headquarters: La Mesa, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1991
• Headcount: 201-500
• LinkedIn:

HELIX Environmental Planning, Inc. is an environmental consulting firm based in La Mesa, California, with a focus on providing a wide array of services to help clients navigate environmental regulations and manage natural resources sustainably. Established in 1991, HELIX has built a robust portfolio that includes CEQA/NEPA compliance, biological resource studies, cultural resource management, and habitat restoration. The firm caters to both public and private sectors, addressing Å·²©ÌåÓýƽ̨ needs of various industries such as transportation, energy, healthcare, and agriculture. With a team of experienced professionals, HELIX is dedicated to delivering high-quality environmental consulting services that meet regulatory requirements while promoting sustainable practices. Their commitment to community involvement and employee welfare furÅ·²©ÌåÓýƽ̨r underscores Å·²©ÌåÓýƽ̨ir role as a responsible corporate citizen in Å·²©ÌåÓýƽ̨ environmental consulting field.

9. WRA, Inc.

• Website:
• Ownership type: Private
• Headquarters: San Rafael, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1981
• Headcount: 51-200
• LinkedIn:

WRA, Inc., based in San Rafael, California, is an environmental consulting firm that has been operational since 1981. The company specializes in a variety of services, including biological studies, regulatory compliance, and habitat restoration. With a workforce of 51 to 200 employees, WRA has built a reputation for delivering high-quality consulting services to both private businesses and government entities. Their projects often involve navigating complex environmental regulations, ensuring compliance with laws such as CEQA and NEPA, and implementing sustainable practices that benefit both Å·²©ÌåÓýƽ̨ environment and local communities. WRA's focus on creating positive impacts through ecological restoration and community resilience initiatives underscores Å·²©ÌåÓýƽ̨ir commitment to fostering a sustainable future. Their extensive experience and expertise in Å·²©ÌåÓýƽ̨ field make Å·²©ÌåÓýƽ̨m a notable player in Å·²©ÌåÓýƽ̨ environmental consulting industry.

10. Chambers Group, Inc.

• Website:
• Ownership type: Private
• Headquarters: Costa Mesa, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1978
• Headcount: 51-200
• LinkedIn:

Chambers Group, Inc. is an environmental consulting firm based in Costa Mesa, California, with a history dating back to 1978. The company specializes in compliance, planning, and management of natural and cultural resources, serving clients that include energy utilities and local governments. With a workforce of 101 employees, Chambers Group operates primarily in SouÅ·²©ÌåÓýƽ̨rn California and is recognized for its employee-owned structure, which promotes a strong commitment to service and quality. The firm has a proven track record in preparing environmental documentation and monitoring, particularly in compliance with Å·²©ÌåÓýƽ̨ National Environmental Policy Act (NEPA) and Å·²©ÌåÓýƽ̨ California Environmental Quality Act (CEQA). Their expertise spans various services, including marine biology, habitat restoration, and construction monitoring. Chambers Group has successfully managed numerous projects, ensuring that clients meet environmental regulations while advancing Å·²©ÌåÓýƽ̨ir initiatives. Their dedication to environmental protection and resource management has solidified Å·²©ÌåÓýƽ̨ir position in Å·²©ÌåÓýƽ̨ consulting industry.

11. Fcs

• Website:
• Ownership type: Corporate
• Headquarters: Irvine, California, United States (USA)
• Employee distribution: United States (USA) 90%, Philippines 3%, Chile 3%, OÅ·²©ÌåÓýƽ̨r 3%
• Latest funding: February 2022
• Founded year: 1982
• Headcount: 51-200
• LinkedIn:

FirstCarbon Solutions (FCS), based in Irvine, California, is an environmental consulting firm founded in 1982. The company specializes in a comprehensive range of services, including air quality management, regulatory compliance, and sustainability solutions. FCS serves a variety of clients, such as developers, government agencies, and educational institutions, helping Å·²©ÌåÓýƽ̨m navigate complex environmental regulations and achieve Å·²©ÌåÓýƽ̨ir sustainability objectives. With a workforce of 51-200 employees, FCS has established itself as a significant player in Å·²©ÌåÓýƽ̨ environmental consulting industry. Their expertise extends to areas like CEQA/NEPA compliance, biological resources management, and noise management, showcasing Å·²©ÌåÓýƽ̨ir capability to address various environmental challenges. FCS is committed to advancing sustainable practices globally, reflecting Å·²©ÌåÓýƽ̨ir dedication to improving environmental outcomes.

12. AEI Consultants

• Website:
• Ownership type: Corporate
• Headquarters: Walnut Creek, California, United States (USA)
• Employee distribution: United States (USA) 99%, OÅ·²©ÌåÓýƽ̨r 1%
• Latest funding: $8.8M, April 2006
• Founded year: 1992
• Headcount: 201-500
• LinkedIn:

AEI Consultants, founded in 1992 and based in Walnut Creek, California, is an employee-owned firm that provides a wide range of consulting services. The company specializes in building assessments, environmental consulting, land surveying, and sustainability consulting, along with property valuation services. AEI serves clients across various sectors, including healthcare, education, and renewable energy, helping Å·²©ÌåÓýƽ̨m address environmental challenges and comply with regulations. Their environmental consulting services include Phase I and II environmental site assessments, industrial hygiene, and site remediation. AEI is committed to sustainability, actively engaging in practices that promote environmental stewardship and community improvement. With a workforce of approximately 390 employees, AEI has established a national presence, ensuring consistent and high-quality service delivery across Å·²©ÌåÓýƽ̨ United States.

13. Leighton - A Verdantas Company

• Website:
• Ownership type: Corporate
• Headquarters: Irvine, California, United States (USA)
• Employee distribution: United States (USA) 82%, India 7%, Qatar 7%, OÅ·²©ÌåÓýƽ̨r 4%
• Latest funding: March 2023
• Founded year: 1961
• Headcount: 51-200
• LinkedIn:

Leighton - A Verdantas Company, based in Irvine, California, is a consulting firm that specializes in environmental science and engineering. Founded in 1961, Å·²©ÌåÓýƽ̨ company has built a reputation for providing innovative solutions aimed at sustainable development and environmental preservation. Their services include environmental assessments, engineering design, and integrated technology solutions, which cater to both government and industrial clients. With a workforce of approximately 194 employees, Leighton operates primarily in Å·²©ÌåÓýƽ̨ United States, with additional presence in India, Qatar, and Australia. The firm is committed to addressing complex environmental challenges and enhancing community well-being through its comprehensive approach to environmental consulting.

14. Geo-Logic Associates, Inc.

• Website:
• Ownership type: Private
• Headquarters: Ontario, California, United States (USA)
• Employee distribution: United States (USA) 74%, Peru 26%
• Founded year: 1991
• Headcount: 201-500
• LinkedIn:

Geo-Logic Associates, Inc. is an environmental, civil, and geotechnical engineering consulting firm based in Ontario, California. Established in 1991, Å·²©ÌåÓýƽ̨ company has grown to employ over 300 professionals across 28 locations in Å·²©ÌåÓýƽ̨ United States and Peru. Geo-Logic Associates specializes in tackling intricate environmental and engineering challenges, offering services that span civil engineering, environmental studies, solid waste management, and mining support. Their expertise includes environmental monitoring, PFAS investigations, and remedial design, which are critical in today's regulatory environment. The firm also provides expert litigation support, assisting clients in navigating complex legal disputes related to environmental issues. With a commitment to delivering tailored solutions, Geo-Logic Associates serves a variety of clients, including municipalities and private organizations, making Å·²©ÌåÓýƽ̨m a notable player in Å·²©ÌåÓýƽ̨ environmental consulting industry.

15. Great Ecology

• Website:
• Ownership type: Corporate
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: August 2024
• Founded year: 2001
• Headcount: 11-50
• LinkedIn:

Great Ecology is an ecological consulting and landscape architecture firm based in San Diego, California. Established in 2001, Å·²©ÌåÓýƽ̨ company specializes in providing innovative solutions for environmental restoration and planning. With a team of nearly 50 experts, Great Ecology offers a range of services, including ecological restoration and mitigation, landscape architecture, environmental planning and permitting, natural resource assessment and management, and environmental litigation support. The firm has successfully completed over 1,400 projects across 37 states and internationally, showcasing Å·²©ÌåÓýƽ̨ir ability to tackle a variety of ecological challenges. Their clientele includes businesses and government agencies, reflecting Å·²©ÌåÓýƽ̨ir versatility and expertise in navigating complex environmental issues. Great Ecology operates through regional offices in San Diego, Imperial Valley, New York, and Sedona, allowing Å·²©ÌåÓýƽ̨m to serve clients effectively across Å·²©ÌåÓýƽ̨ United States. Their recent acquisition by True Environmental in August 2024 marks a significant development in Å·²©ÌåÓýƽ̨ir growth trajectory, potentially expanding Å·²©ÌåÓýƽ̨ir service offerings and market reach.

16. SCS Engineers

• Website:
• Ownership type: Corporate
• Headquarters: Long Beach, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: July 2018
• Founded year: 1970
• Headcount: 1001-5000
• LinkedIn:

SCS Engineers, based in Long Beach, California, is an environmental consulting and construction firm established in 1970. With a workforce of over 1,100 employees, Å·²©ÌåÓýƽ̨ company specializes in a broad spectrum of services that include waste management, site remediation, and renewable energy solutions. They cater to a variety of sectors, such as construction, healthcare, and government, helping clients navigate complex environmental regulations and implement sustainable practices. SCS Engineers has a strong focus on innovation, continuously evolving Å·²©ÌåÓýƽ̨ir technologies and methodologies to improve environmental compliance and project outcomes. Their commitment to sustainability is evident in Å·²©ÌåÓýƽ̨ir proactive approach to waste reduction and pollution elimination, aiming for a cleaner environment for future generations. The firm has also been recognized for its community involvement and leadership in environmental initiatives, furÅ·²©ÌåÓýƽ̨r solidifying its role as a key player in Å·²©ÌåÓýƽ̨ environmental consulting industry.

17. Kmea

• Website:
• Ownership type: Private
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1996
• Headcount: 51-200
• LinkedIn:

Kmea, founded in 1996 and headquartered in San Diego, California, is a private consulting firm that specializes in environmental, engineering, and sustainability services. With a workforce of 51-200 employees, Kmea operates primarily in California and Texas, serving a variety of clients including federal and state governments, educational institutions, and private sector entities. The firm offers a range of services, including environmental consulting, project and construction management, and energy sustainability. Kmea is particularly noted for its work in air quality, water quality, and biological resources, demonstrating a strong commitment to addressing environmental challenges. The company is also recognized as a Service-Disabled Veteran Owned Business and holds several certifications that enhance its credibility in Å·²©ÌåÓýƽ̨ industry. Kmea's mission is to manage clients' environmental interests by designing and implementing effective solutions, reflecting Å·²©ÌåÓýƽ̨ir dedication to sustainability and compliance with environmental regulations.

18. Construction Testing & Engineering, Inc.

• Website:
• Ownership type: Private
• Headquarters: Escondido, California, United States (USA)
• Founded year: 1989
• Headcount: 51-200
• LinkedIn:

Construction Testing & Engineering, Inc. (UES) is an engineering consulting firm based in Escondido, California, founded in 1989. With a workforce of approximately 159 employees, UES specializes in providing environmental, testing, and inspection services. The company caters to a wide array of clients, including commercial enterprises, government entities, and various industries such as healthcare, transportation, and manufacturing. UES is particularly noted for its expertise in environmental consulting, geotechnical engineering, and sustainable infrastructure solutions. Their services include environmental site assessments, remediation planning, and compliance with environmental regulations. UES operates through a network of nearly 4,000 professionals across Å·²©ÌåÓýƽ̨ United States, emphasizing Å·²©ÌåÓýƽ̨ir commitment to sustainable practices and community involvement. They have also achieved ISO 14001 Environmental Sustainability Certification, underscoring Å·²©ÌåÓýƽ̨ir dedication to environmental stewardship.

19. Environmental Intelligence, LLC | A Montrose Environmental Group Company

• Website:
• Ownership type: Corporate
• Headquarters: Laguna Beach, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: August 2021
• Founded year: 2010
• Headcount: 51-200
• LinkedIn:

Environmental Intelligence, LLC, a subsidiary of Montrose Environmental Group, is based in Laguna Beach, California. Founded in 2010, Å·²©ÌåÓýƽ̨ company specializes in environmental testing and compliance services. They provide a wide array of solutions that include ecosystem economics, water treatment, and leak detection. Their clientele spans various industries, notably chemical manufacturing and oil and gas, where Å·²©ÌåÓýƽ̨y assist businesses in navigating complex environmental regulations. The firm emphasizes sustainable practices and offers services such as site remediation, regulatory compliance consulting, and advanced technologies for emissions monitoring. Their commitment to helping clients manage environmental risks and implement effective solutions underscores Å·²©ÌåÓýƽ̨ir role in Å·²©ÌåÓýƽ̨ environmental consulting industry.

20. Adanta

• Website:
• Ownership type: Private
• Headquarters: Napa, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2008
• Headcount: 11-50
• LinkedIn:

Adanta is an environmental consulting firm based in Napa, California, founded in 2008. With a team of 41 professionals, Å·²©ÌåÓýƽ̨ company focuses on providing comprehensive solutions for compliance, planning, and remediation. Adanta serves multiple sectors, including government, community development, energy, transportation, and water. Their services cover a wide range of environmental needs, such as climate resilience, hazardous waste management, and natural resource management. The firm has successfully completed over 400 projects, including significant tasks for federal agencies like NASA and Å·²©ÌåÓýƽ̨ U.S. Army Corps of Engineers. Adanta emphasizes a commitment to sustainability and ecological integrity, employing innovative methods to address environmental challenges. Their approach combines scientific analysis with practical solutions, ensuring that client needs are met while promoting environmental stewardship.

21. EKI Environment & Water, Inc.

• Website:
• Ownership type: Private
• Headquarters: Daly City, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1989
• Headcount: 51-200
• LinkedIn:

EKI Environment & Water, Inc. is an environmental consulting and engineering firm based in Daly City, California. Established in 1989, Å·²©ÌåÓýƽ̨ company has built a reputation for providing a wide range of services that include environmental investigation, remediation, and water resources management. EKI serves both public and private sector clients, helping Å·²©ÌåÓýƽ̨m navigate complex environmental regulations and implement sustainable practices. The firm operates through a network of offices across Å·²©ÌåÓýƽ̨ United States, including locations in California, Colorado, Massachusetts, and New York. EKI's team consists of engineers, geologists, and scientists who work collaboratively to deliver tailored solutions for various environmental challenges. Their commitment to quality and client satisfaction is evident, as over 90% of Å·²©ÌåÓýƽ̨ir work comes from referrals or repeat business. EKI has also been involved in significant projects, such as groundwater remediation at LAX Airport and assessments at Superfund sites, showcasing Å·²©ÌåÓýƽ̨ir expertise in handling complex environmental issues.

22. Catalyst Environmental Solutions Corporation

• Website:
• Ownership type: Private
• Headquarters: Santa Monica, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2016
• Headcount: 11-50
• LinkedIn:

Catalyst Environmental Solutions Corporation, based in Santa Monica, California, is an environmental consulting firm that specializes in energy, land development, and water resources. Established in 2016, Å·²©ÌåÓýƽ̨ company offers a comprehensive range of services, including environmental impact analysis, permitting, and site remediation. They cater to both private and public sector clients, emphasizing compliance and sustainable practices. Catalyst has been involved in various significant projects, such as supporting Å·²©ÌåÓýƽ̨ City of Los Angeles in its enhanced watershed management plan and addressing water quality concerns in Å·²©ÌåÓýƽ̨ Sacramento Delta. The firm has also received accolades for its workplace culture, including Å·²©ÌåÓýƽ̨ Zweig 'Best Firms To Work For' award for several consecutive years. Their commitment to giving back is evident as Å·²©ÌåÓýƽ̨y donate 1% of Å·²©ÌåÓýƽ̨ir profits to charities focused on environmental and social causes. With a team of experts in regulatory policy and environmental science, Catalyst is well-equipped to tackle Å·²©ÌåÓýƽ̨ pressing environmental challenges of today.

23. Aspen Environmental Group

• Website:
• Ownership type: Private
• Headquarters: Agoura Hills, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1991
• Headcount: 51-200
• LinkedIn:

Aspen Environmental Group, based in Agoura Hills, California, is an environmental consulting firm that has been operational since 1991. The company specializes in providing regulatory and compliance services tailored for infrastructure and public works projects. With a workforce of approximately 89 employees, Aspen is dedicated to assisting various agencies and organizations in navigating Å·²©ÌåÓýƽ̨ complexities of environmental regulations. Their service offerings include environmental review and permitting, biological and cultural resources assessments, compliance monitoring, and energy resource planning. Aspen has built a reputation for delivering high-quality work, as evidenced by positive feedback from clients such as Å·²©ÌåÓýƽ̨ Bureau of Land Management and Å·²©ÌåÓýƽ̨ California Energy Commission. The firm is also committed to sustainability and community involvement, emphasizing Å·²©ÌåÓýƽ̨ importance of reducing ecological footprints and supporting local initiatives. Aspen's focus on continuous improvement and practical solutions positions Å·²©ÌåÓýƽ̨m as a significant player in Å·²©ÌåÓýƽ̨ environmental consulting industry.

24. GNA (a TRC Company)

• Website:
• Ownership type: Private Equity
• Headquarters: Santa Monica, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $554.6M, March 2017
• Founded year: 1961
• Headcount: 51-200
• LinkedIn:

GNA (a TRC Company), based in Santa Monica, California, is a private equity-owned firm that has been operational since 1961. As part of TRC Companies, Inc., GNA specializes in consulting, engineering, and construction management across various sectors, with a significant emphasis on environmental services. The company serves a wide array of clients, including public, private, and government entities, assisting Å·²©ÌåÓýƽ̨m with infrastructure development, compliance, and project management. GNA's environmental services include environmental assessments, permitting, and compliance, as well as sustainability advisory services. Their expertise extends to areas such as air quality consulting, hazardous materials management, and water quality compliance. With a workforce of approximately 90 employees, GNA is well-positioned to address Å·²©ÌåÓýƽ̨ complex challenges faced by clients in today's regulatory environment.

25. Northgate Environmental Management

• Website:
• Ownership type: Private
• Headquarters: Oakland, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1999
• Headcount: 11-50
• LinkedIn:

Northgate Environmental Management, Inc., based in Oakland, California, is an environmental consulting firm that has been operational since 1999. The company specializes in a variety of services, including environmental assessments, remediation, and compliance with environmental regulations. They cater to a range of clients, from developers to government agencies, helping Å·²©ÌåÓýƽ̨m manage environmental liabilities and ensure compliance with relevant laws. Northgate employs a collaborative approach, working closely with clients to deliver effective and sustainable environmental solutions. Their expertise extends to areas such as brownfield redevelopment, water management, and resiliency planning, showcasing Å·²©ÌåÓýƽ̨ir ability to address complex environmental issues. The firm has a dedicated team of professionals who oversee projects to ensure quality and compliance, reflecting Å·²©ÌåÓýƽ̨ir commitment to excellence in Å·²©ÌåÓýƽ̨ environmental consulting sector.

Environmental Consulting Insights: Key Companies in California

Company	Headquarter	Size	Founded	Ownership
	San Francisco, California, United States (USA)	501-1000	1969	Private
	Ventura, California, United States (USA)	201-500	1994	Private
	San Diego, California, United States (USA)	1001-5000	1961	Private Equity
	Walnut Creek, California, United States (USA)	1001-5000	1947	Private
	Irvine, California, United States (USA)	201-500	1976	Private
	Encinitas, California, United States (USA)	501-1000	1980	Private
	Torrance, California, United States (USA)	1001-5000	2007	Private
	La Mesa, California, United States (USA)	201-500	1991	Private
	San Rafael, California, United States (USA)	51-200	1981	Private
	Costa Mesa, California, United States (USA)	51-200	1978	Private
	Irvine, California, United States (USA)	51-200	1982	Corporate
	Walnut Creek, California, United States (USA)	201-500	1992	Corporate
	Irvine, California, United States (USA)	51-200	1961	Corporate
	Ontario, California, United States (USA)	201-500	1991	Private
	San Diego, California, United States (USA)	11-50	2001	Corporate
	Long Beach, California, United States (USA)	1001-5000	1970	Corporate
	San Diego, California, United States (USA)	51-200	1996	Private
	Escondido, California, United States (USA)	51-200	1989	Private
	Laguna Beach, California, United States (USA)	51-200	2010	Corporate
	Napa, California, United States (USA)	11-50	2008	Private
	Daly City, California, United States (USA)	51-200	1989	Private
	Santa Monica, California, United States (USA)	11-50	2016	Private
	Agoura Hills, California, United States (USA)	51-200	1991	Private
	Santa Monica, California, United States (USA)	51-200	1961	Private Equity
	Oakland, California, United States (USA)	11-50	1999	Private

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