Top 23 Engineering Consulting Companies in California

Engineering consulting companies in California offer specialized expertise in various sectors including environmental management, infrastructure development, and technology integration. These firms provide crucial services such as project management, compliance assessments, and innovative engineering solutions to both public and private clients. As sustainability becomes a critical focus, many companies are adopting practices that align with environmental regulations and community needs. The industry is evolving, with an increasing demand for solutions that address climate change and resource efficiency, reflecting changing priorities in infrastructure planning and development.

This list includes 23 engineering consulting companies in California, varying in size from small firms to those employing thousands. Established between 1945 and 2011, these companies primarily operate from major cities such as San Francisco, Los Angeles, and San Diego. Their specialties include environmental engineering, structural analysis, and project management across sectors like transportation, healthcare, and energy. With a strong emphasis on innovation, many firms also prioritize sustainability in their projects, promoting energy efficiency and regulatory compliance.

Discover the top engineering consulting companies in California today.

Top 23 Engineering Consulting Companies in California

1. Kleinfelder

• Website: kleinfelder.com
• 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

Kleinfelder, Inc. is an engineering and environmental consulting firm based in San Diego, California. Established in 1961, the company has built a reputation for providing a range of professional services that include environmental assessments, construction materials testing, and construction management. Kleinfelder serves a variety of clients, from government agencies to private sector companies, particularly in infrastructure projects. Their expertise is particularly notable in areas such as sustainable development and regulatory compliance, which are increasingly important in today's environmental landscape. The firm operates primarily in the United States, with a small presence in Canada and Australia, and employs over 2,600 professionals. Kleinfelder's commitment to improving infrastructure while protecting the environment positions them as a relevant player in the engineering consulting industry.

2. Moffatt & Nichol

• Website: moffattnichol.com
• Ownership type: Private
• Headquarters: Long Beach, California, United States (USA)
• Employee distribution: United States (USA) 79%, United Kingdom (UK) 6%, Brazil 4%, Other 11%
• Founded year: 1945
• Headcount: 1001-5000
• LinkedIn: moffatt-%26-nichol

Moffatt & Nichol is a consulting and engineering firm based in Long Beach, California, specializing in ports, transportation, water management, and environmental resilience. With a workforce of approximately 1,179 employees, the firm has been operational since 1945, providing professional services that include planning, design, and analysis for infrastructure projects. Moffatt & Nichol has a notable presence in the marine and ports sector, having been ranked No. 1 in Marine and Port Facilities by Engineering News-Record for three consecutive years. Their portfolio includes significant projects such as the I-405 Improvement Project in California and the San Elijo Lagoon Restoration. The firm also emphasizes environmental sustainability and resilience in its projects, reflecting a commitment to addressing contemporary challenges in infrastructure development.

3. GNA (a TRC Company)

• Website: trccompanies.com
• 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: gladstein-neandross-%26-associates

GNA (a TRC Company) operates as a consulting, engineering, and construction management firm based in Santa Monica, California. With a workforce of approximately 90 employees, the company has been active since 1961, providing a wide array of services across various sectors. Their expertise spans Power and Utilities, Transportation, and Environmental Services, catering to a mix of public, private, and government clients. GNA assists in infrastructure development, ensuring compliance with regulations, and managing projects from inception to completion. Their focus on sustainable practices and innovative solutions positions them as a relevant player in the engineering consulting field, addressing contemporary challenges in energy, transportation, and environmental management.

4. P2s

• Website: p2sinc.com
• Ownership type: Venture Capital
• Headquarters: Long Beach, California, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Latest funding: April 2024
• Founded year: 1991
• Headcount: 201-500
• LinkedIn: p2sinc

P2S, based in Long Beach, California, is an engineering firm established in 1991. The company specializes in mechanical, electrical, plumbing, and technology design services, with a strong emphasis on sustainable solutions. P2S serves clients primarily in the education, healthcare, and public sectors, helping them improve facility performance while ensuring compliance with safety standards. The firm operates on a project-based model, which allows for tailored engineering and consulting services that meet specific client needs. P2S has a notable presence in the industry, having been recognized as a Top 500 Design Firm by Engineering News-Record. Their focus on innovative and sustainable practices positions them as a relevant player in the engineering consulting space.

5. Dudek

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

Dudek is a consulting firm based in Encinitas, California, established in 1980. The company specializes in environmental planning, engineering, and project management, providing services that cater to both government agencies and private developers. With a workforce of approximately 729 employees, Dudek operates across multiple sectors, including water, energy, transportation, and conservation. Their expertise lies in navigating regulatory compliance and ensuring effective project execution. Over the years, Dudek has expanded its capabilities, integrating multidisciplinary approaches to address complex challenges in environmental and engineering projects. The firm has successfully completed numerous projects, showcasing its commitment to enhancing community infrastructure and environmental stewardship.

6. TechnoStruct, LLC

• Website: technostruct.com
• Ownership type: Private
• Headquarters: Redwood City, California, United States (USA)
• Employee distribution: India 64%, United States (USA) 35%, Other 1%
• Founded year: 2003
• Headcount: 51-200
• LinkedIn: technostruct

TechnoStruct, LLC, founded in 2003 and based in Redwood City, California, is an engineering firm that specializes in Design and Construction technology. The company offers a range of services, including BIM implementation, coordination, and production, alongside electrical, mechanical, and plumbing engineering solutions. TechnoStruct primarily serves clients in the construction and architecture sectors, aiming to enhance project design and execution efficiency. With a workforce of approximately 139 employees, the firm has established a presence in notable projects across Northern California, including high-profile developments like the Apple Headquarters and the Lucile Packard Children's Hospital. Their commitment to engineering design optimization and collaboration with trade partners positions them as a relevant player in the engineering consulting industry.

7. Cannon

• Website: cannoncorp.us
• Ownership type: Private
• Headquarters: San Luis Obispo, California, United States (USA)
• Employee distribution: United States (USA) 89%, Argentina 3%, Pakistan 3%, Other 6%
• Founded year: 1976
• Headcount: 51-200
• LinkedIn: cannon-

Cannon is an engineering consulting firm based in San Luis Obispo, California, founded in 1976. With a workforce of 51-200 employees, the company specializes in a variety of services, including automation and controls, construction management, engineering design, and surveying and mapping. They cater to multiple industries, such as aerospace and defense, education, energy, and municipal projects. Cannon is known for its commitment to providing reliable and responsive solutions, which are rooted in a multidisciplinary approach. This approach not only enhances project outcomes but also fosters long-term relationships with clients. The firm has built a reputation for quality and efficiency, actively supporting clients by seeking ways to add value to their projects. Cannon's projects range from structural upgrades in aerospace to community infrastructure improvements, showcasing their versatility and expertise in the engineering consulting sector.

8. EDM Services, Inc.

• Website: edmsvc.com
• Ownership type: Private
• Headquarters: Simi Valley, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1990
• Headcount: 51-200
• LinkedIn: edm-services-inc.

EDM Services, Inc., based in Simi Valley, California, has been a prominent player in the engineering sector since its inception in 1990. The firm specializes in a wide array of engineering, design, and project management services tailored for industrial, commercial, and private clients. With a workforce of approximately 60 employees, EDM Services has successfully completed thousands of projects, particularly in pipeline engineering, structural design, and environmental compliance. Their expertise extends to working with major international oil companies and various governmental agencies, providing services that include design review, risk assessment, and inspection. The company prides itself on delivering high-quality, cost-effective solutions while maintaining a strong commitment to safety and environmental stewardship. Their certification as a Disadvantaged Business Enterprise by the California Public Utilities Commission further underscores their credibility and dedication to community engagement.

9. Mazzetti

• Website: mazzetti.com
• Ownership type: Private
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 92%, India 5%, Other 3%
• Founded year: 1962
• Headcount: 201-500
• LinkedIn: mazzetti

Mazzetti is a private consulting firm based in San Francisco, California, founded in 1962. With a workforce of approximately 327 employees, the company specializes in engineering services tailored primarily for the healthcare sector. Their offerings include MEP engineering, medical equipment planning, and sustainability consulting. Mazzetti's clients are predominantly healthcare organizations aiming to enhance operational efficiency and comply with industry standards. The firm adopts a collaborative approach, ensuring that solutions are customized to meet the unique requirements of each project. Mazzetti also emphasizes sustainability, with initiatives aimed at reducing carbon emissions and improving energy efficiency in healthcare facilities. Their commitment to innovation and adaptation in the face of evolving technologies and environmental challenges further solidifies their role in the engineering consulting industry.

10. URS Corporation, An AECOM Company

• Website: urs.com
• Ownership type: Corporate
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 75%, Kuwait 5%, India 4%, Other 16%
• Latest funding: $4.0B, July 2014
• Founded year: 1904
• Headcount: 10001+
• LinkedIn: urs-corporation

URS Corporation, now operating as part of AECOM, is an infrastructure consulting firm based in San Francisco, California. Founded in 1904, the company has built a reputation for providing comprehensive services that include architecture, engineering, construction management, and environmental services. URS Corporation serves a variety of sectors, notably government and healthcare, addressing complex infrastructure challenges and delivering sustainable projects. With a workforce exceeding 10,000 employees, the company has a significant presence in the United States and operates in several other countries, including Kuwait, India, and the United Kingdom. Their portfolio includes high-profile projects such as the One World Trade Center and the Port of Los Angeles Waterfront, showcasing their capability in managing large-scale engineering endeavors.

11. iFactor

• Website: ifactor.com
• Ownership type: Private
• Headquarters: El Segundo, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2006
• Headcount: 11-50
• LinkedIn: infrastructure-factor-consulting

iFactor, officially known as Infrastructure Factor Consulting, Inc., is an engineering consulting firm based in El Segundo, California. Established in 2006, the company specializes in mechanical, electrical, and plumbing (MEP) engineering, sustainable building design, and mission-critical services. With a workforce of 33 employees, iFactor has carved out a niche by serving Fortune 500 clients across sectors such as healthcare, aviation, retail, and technology. Their hands-on approach ensures that they meet the infrastructure needs of their clients effectively. iFactor has been recognized for its commitment to sustainability, with a significant number of ongoing net-zero projects and a team that includes LEED-accredited professionals. The firm has also been awarded for its design excellence in various projects, showcasing its capability in delivering high-quality engineering solutions. Their client portfolio includes notable names like Bank of America and Kaiser Permanente, reflecting their experience in handling complex projects. iFactor operates with a strong emphasis on client relationships, as evidenced by their high rate of repeat business.

12. Bengal Engineering

• Website: bengalengineering.com
• Ownership type: Private
• Headquarters: Santa Barbara, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1996
• Headcount: 1-10
• LinkedIn: bengal-engineering-civil-engineers

Bengal Engineering is a civil engineering firm based in Santa Barbara, California, established in 1996. The company specializes in a variety of engineering services, including hydraulic, structural, and geotechnical engineering. With a team that boasts over 100 years of combined experience, Bengal Engineering is dedicated to providing high-quality solutions for infrastructure development and environmental management. They serve local agencies and businesses, focusing on projects that enhance community safety and sustainability. Notable projects include flood control initiatives and habitat improvements, showcasing their expertise in managing complex engineering challenges. The firm prides itself on delivering cost-effective and precise designs, making it a reliable partner for both public and private sector clients.

13. Partner Engineering & Science, Inc.

• Website: partneresi.com
• Ownership type: Private
• Headquarters: Torrance, California, United States (USA)
• Employee distribution: United States (USA) 97%, Other 3%
• Founded year: 2007
• Headcount: 1001-5000
• LinkedIn: partner-engineering-%26-science-inc.

Partner Engineering & Science, Inc. is a consulting firm based in Torrance, California, specializing in engineering, environmental, construction, and energy services. Established in 2007, the company has grown to employ over 1,200 professionals, primarily in the United States. Partner provides a wide array of services, including property condition assessments, environmental site assessments, construction risk management, and energy efficiency consulting. They cater to various sectors, notably commercial real estate, helping clients navigate the complexities of property management and investment. Their multidisciplinary approach allows them to address technical challenges comprehensively, ensuring that clients receive tailored solutions that meet their specific needs. Partner's commitment to sustainability and environmental responsibility is evident in their energy consulting services, which include ESG consulting and renewable energy solutions. This focus on both engineering excellence and environmental stewardship positions them as a relevant player in the consulting industry.

14. Budlong

• Website: budlong.com
• Ownership type: Private
• Headquarters: Los Angeles, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1958
• Headcount: 51-200
• LinkedIn: budlong-%26-associates-inc.

Budlong Inc. is an engineering firm based in Los Angeles, California, specializing in mechanical, electrical, and plumbing (MEP) engineering services. Founded in 1958, the company has a rich history of providing consulting and design solutions for a wide array of projects, including commercial, educational, and healthcare facilities. Budlong collaborates closely with architects and developers, ensuring that their engineering designs meet both project specifications and sustainability goals. The firm has successfully completed thousands of projects throughout Southern California, demonstrating their capability and expertise in the industry. Budlong is also committed to fostering a new generation of LEED-certified engineers, reflecting their dedication to environmental responsibility. Their team is equipped with advanced technologies and software, enhancing their efficiency and quality control. Budlong is recognized as a Small Business Enterprise (SBE) and holds various certifications, which further solidifies their standing in the engineering consulting sector.

15. Wood Rodgers, Inc.

• Website: woodrodgers.com
• Ownership type: Private
• Headquarters: Sacramento, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1997
• Headcount: 201-500
• LinkedIn: woodrodgersinc

Wood Rodgers, Inc. is an engineering firm based in Sacramento, California, with additional offices in key locations across California and Nevada. Established in 1997, the company has grown to employ around 338 professionals. They provide a comprehensive suite of services that includes aviation, environmental consulting, geotechnical engineering, land development, landscape architecture, planning, structural engineering, surveying, transportation, and water resources. Wood Rodgers caters to both private and public sector clients, focusing on delivering innovative solutions tailored to meet specific project needs. Their recent achievements, such as receiving the Special Achievement in GIS Award for their work on the Caltrans District 3 Middle Mile Broadband Network project, underscore their active role in the engineering consulting industry. The firm emphasizes strong client relationships and a collaborative approach, which has contributed to their reputation and success in various engineering disciplines.

16. Salas O'Brien

• Website: salasobrien.com
• Ownership type: Private Equity
• Headquarters: Irvine, California, United States (USA)
• Employee distribution: United States (USA) 94%, Canada 6%
• Latest funding: January 2024
• Founded year: 1975
• Headcount: 1001-5000
• LinkedIn: salas-o%27brien

Salas O'Brien is an engineering and consulting firm based in Irvine, California, with a workforce of approximately 1,738 employees. Established in 1975, the company specializes in providing innovative solutions in the built environment, energy efficiency, and sustainability. They cater to a wide array of sectors, including healthcare, education, and government, assisting clients in navigating complex engineering challenges while achieving their sustainability goals. Salas O'Brien emphasizes the importance of sustainability in all their projects, integrating it into their core services. Their expertise spans various areas, including mechanical, electrical, and plumbing (MEP) engineering, structural engineering, civil engineering, and advanced consulting services. The firm has also been involved in significant projects, such as the design of energy-efficient facilities and the implementation of renewable energy systems. With a strong focus on professional development and a commitment to fostering a supportive work environment, Salas O'Brien continues to grow and adapt to the evolving needs of the industry.

17. MARRS Services, Inc.

• Website: marrscorp.com
• Ownership type: Private
• Headquarters: Fullerton, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1989
• Headcount: 51-200
• LinkedIn: marrs-services-inc.

MARRS Services, Inc., based in Fullerton, California, is a consulting and project management firm that has been active since 1989. The company specializes in engineering services across several sectors, including aviation, transportation, water and wastewater, and environmental compliance. MARRS provides a comprehensive suite of services, including project and construction management, design, engineering studies, and sustainability initiatives. They have a strong track record of working with government agencies and private clients, ensuring that projects are delivered efficiently and in compliance with regulations. MARRS is also recognized as a woman and minority-owned small business, holding various certifications that enhance their credibility in the industry. Their commitment to sustainability is evident in their projects, which often incorporate innovative approaches to resource conservation and environmental management. MARRS has successfully managed significant projects, such as the LAWA/LAX Upgrade and Modernization Program and the City of LA Hyperion Water Reclamation Plant, showcasing their capability in handling complex engineering challenges.

18. Project Design Consultants, a Bowman company

• Website: projectdesign.com
• Ownership type: Corporate
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 91%, Nigeria 9%
• Latest funding: July 2022
• Founded year: 1976
• Headcount: 51-200
• LinkedIn: project-design-consultants

Project Design Consultants, a Bowman company, is an engineering and consulting firm based in San Diego, California. Established in 1976, the company specializes in a wide array of services, including civil engineering, mechanical, electrical, and plumbing (MEP) engineering, environmental consulting, and construction management. They cater to both public and private sector clients, providing expertise in infrastructure projects, energy solutions, and environmental compliance. With a workforce of approximately 68 employees, the firm operates primarily in the United States, with a small presence in Nigeria. Their portfolio includes significant projects across various markets, such as transportation, renewable energy, and building infrastructure. The company has demonstrated its ability to deliver innovative solutions to complex engineering challenges, making it a relevant player in the engineering consulting industry.

19. Kennedy Jenks

• Website: kennedyjenks.com
• Ownership type: Corporate
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: December 2014
• Founded year: 1919
• Headcount: 201-500
• LinkedIn: kennedyjenks-consultants

Kennedy Jenks is an engineering and consulting firm based in San Francisco, California, with a focus on water and industrial projects. Founded in 1919, the company has built a strong reputation for its expertise in wastewater treatment, design engineering, and natural resource management. They serve a broad clientele, including public agencies and private enterprises, reflecting their ability to address complex infrastructure challenges. Kennedy Jenks emphasizes innovative solutions and sustainable practices, which are increasingly important in the context of environmental regulations and resource management. Their portfolio includes a variety of projects, from facility planning and design to compliance and construction management. The firm prides itself on its long-standing relationships with clients, many of whom have relied on their services for decades. This loyalty is indicative of their commitment to quality and responsiveness in a competitive market.

20. AlfaTech

• Website: atce.com
• Ownership type: Private
• Headquarters: San Jose, California, United States (USA)
• Employee distribution: United States (USA) 94%, Singapore 4%, Other 2%
• Founded year: 1987
• Headcount: 51-200
• LinkedIn: alfa-tech

AlfaTech, based in San Jose, California, is a private engineering firm that specializes in mechanical, electrical, and plumbing (MEP) engineering, technology design, and sustainability solutions. Established in 1987, the company has built a reputation for creating efficient and environmentally friendly facilities. AlfaTech serves a wide range of sectors, including advanced technology, higher education, hospitality, and industrial manufacturing. Their projects reflect a commitment to innovation and collaboration, as they work closely with clients to develop tailored solutions that meet specific needs. The firm emphasizes sustainability in its designs, integrating energy-efficient systems and smart technologies to enhance operational efficiency. With a workforce of around 415 employees, AlfaTech continues to play a significant role in shaping modern engineering practices, focusing on creating facilities that are not only functional but also environmentally responsible.

21. Plump Engineering, Inc.

• Website: peica.com
• Ownership type: Private
• Headquarters: Anaheim, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1989
• Headcount: 51-200
• LinkedIn: plump-engineering-inc.

Plump Engineering, Inc. is an architectural and engineering firm based in Anaheim, California, with a history dating back to 1989. The company specializes in civil engineering solutions and offers a comprehensive range of services, including structural, mechanical, electrical, and plumbing engineering. With a team of over 70 employees, including licensed architects and engineers, Plump Engineering is equipped to handle complex projects across various sectors such as aerospace, healthcare, and utilities. Their portfolio includes significant projects like the safe transport of the Space Shuttle Endeavour and the movement of massive industrial equipment, highlighting their expertise in logistics and infrastructure. The firm prides itself on its commitment to quality and responsiveness, ensuring that client needs are met throughout the project lifecycle. Plump Engineering is licensed to operate in all 50 states, further solidifying its national presence in the engineering consulting field.

22. Degenkolb Engineers

• Website: degenkolb.com
• Ownership type: Private
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 96%, Mexico 4%
• Founded year: 1940
• Headcount: 201-500
• LinkedIn: degenkolb-engineers

Degenkolb Engineers, based in San Francisco, California, is a private engineering firm that specializes in structural engineering and seismic safety solutions. Established in 1940, the company has built a reputation for its technical expertise and commitment to client collaboration. Degenkolb offers a range of services, including seismic evaluations, retrofitting, construction engineering, and forensic engineering. They primarily serve clients in the healthcare, education, and government sectors, emphasizing safety and compliance in building design. The firm has been involved in numerous projects that focus on seismic safety, helping clients navigate the complexities of building codes and regulations. With a workforce of over 300 experienced engineers, Degenkolb fosters a culture of lifelong learning and innovation, ensuring they remain at the forefront of the engineering consulting industry.

23. HydroScience Engineers

• Website: hydroscience.com
• Ownership type: Private
• Headquarters: Sacramento, California, United States (USA)
• Employee distribution: United States (USA) 82%, Vietnam 14%, Myanmar 4%
• Founded year: 1997
• Headcount: 11-50
• LinkedIn: hydroscience-engineers

HydroScience Engineers is a civil engineering firm based in Sacramento, California, established in 1997. The company specializes in water, wastewater, and recycled water projects, providing a full suite of services that includes planning, design, and construction support. HydroScience has worked on numerous projects that address critical water management needs, ensuring compliance with regulations while delivering efficient solutions. Their team consists of skilled professionals, including civil, mechanical, and electrical engineers, as well as licensed operators and CAD designers. The firm has successfully completed various projects, such as wastewater treatment plant upgrades and recycled water distribution systems, demonstrating their capability in handling complex engineering challenges. HydroScience operates multiple offices in Northern California and has a presence in Australia, further extending their reach in the industry.

Engineering Consulting Insights: Key Companies in California

Company	Headquarter	Size	Founded	Ownership
Kleinfelder	San Diego, California, United States (USA)	1001-5000	1961	Private Equity
Moffatt & Nichol	Long Beach, California, United States (USA)	1001-5000	1945	Private
GNA (a TRC Company)	Santa Monica, California, United States (USA)	51-200	1961	Private Equity
P2s	Long Beach, California, United States (USA)	201-500	1991	Venture Capital
Dudek	Encinitas, California, United States (USA)	501-1000	1980	Private
TechnoStruct, LLC	Redwood City, California, United States (USA)	51-200	2003	Private
Cannon	San Luis Obispo, California, United States (USA)	51-200	1976	Private
EDM Services, Inc.	Simi Valley, California, United States (USA)	51-200	1990	Private
Mazzetti	San Francisco, California, United States (USA)	201-500	1962	Private
URS Corporation, An AECOM Company	San Francisco, California, United States (USA)	10001+	1904	Corporate
iFactor	El Segundo, California, United States (USA)	11-50	2006	Private
Bengal Engineering	Santa Barbara, California, United States (USA)	1-10	1996	Private
Partner Engineering & Science, Inc.	Torrance, California, United States (USA)	1001-5000	2007	Private
Budlong	Los Angeles, California, United States (USA)	51-200	1958	Private
Wood Rodgers, Inc.	Sacramento, California, United States (USA)	201-500	1997	Private
Salas O'Brien	Irvine, California, United States (USA)	1001-5000	1975	Private Equity
MARRS Services, Inc.	Fullerton, California, United States (USA)	51-200	1989	Private
Project Design Consultants, a Bowman company	San Diego, California, United States (USA)	51-200	1976	Corporate
Kennedy Jenks	San Francisco, California, United States (USA)	201-500	1919	Corporate
AlfaTech	San Jose, California, United States (USA)	51-200	1987	Private
Plump Engineering, Inc.	Anaheim, California, United States (USA)	51-200	1989	Private
Degenkolb Engineers	San Francisco, California, United States (USA)	201-500	1940	Private
HydroScience Engineers	Sacramento, California, United States (USA)	11-50	1997	Private

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