The engineering consulting industry in California comprises firms that provide multidisciplinary engineering, science, and construction services. These companies offer custom solutions, rendered by highly skilled experts, to manage and execute projects in sectors such as environmental science, construction, technology, and more. They aid in the planning, execution, and management of projects, often using sustainable practices and cutting-edge technology. The industry is seen moving towards an increased adoption of renewable energy systems, revealing a promising future trend in the sector.


Top 23 engineering consulting companies in California

1. Tetra Tech

  • Website: tetratech.com
  • Headquarters: Pasadena, California, United States
  • Founded: 1966
  • Headcount: 10001+
  • Latest funding type: Ipo
  • LinkedIn

Tetra Tech is a leading provider of consulting, engineering, and technical services worldwide. The company offers integrated solutions to meet clients' needs in areas such as environmental science, research, engineering, construction, and information technology.


2. Kleinfelder

  • Website: kleinfelder.com
  • Headquarters: San Diego, California, United States
  • Founded: 1961
  • Headcount: 1001-5000
  • Latest funding type: Acquired
  • LinkedIn

Kleinfelder is a company that offers comprehensive engineering, construction management, environmental, and science services to public and private sector clients.


3. Salas O'Brien

  • Website: salasobrien.com
  • Headquarters: Santa Ana, California, United States
  • Founded: 1975
  • Headcount: 1001-5000
  • LinkedIn

Salas O'Brien is a design services company that offers a range of consulting and engineering services to clients in various industries. They specialize in helping clients navigate the complex process of designing and implementing renewable energy systems, including geothermal and renewables. With a focus on sustainability, Salas O'Brien provides solutions for complex challenges and has a passion for technical mastery in their craft.


4. E2 Consulting Engineers, Inc.

  • Website: e2.com
  • Headquarters: Emeryville, California, United States
  • Founded: 1988
  • Headcount: 501-1000
  • LinkedIn

E2 Consulting Engineers, Inc. is an engineering and consulting firm specializing in environmental investigation, permitting, and remediation. They offer a range of services including construction management, construction inspection, engineering and design, and project management. E2's M2M® software provides modules for end-to-end program management and construction inspection. Their customer groups may include federal agencies, technology companies, transportation entities, and utilities. E2's business model involves providing services and software solutions to various industries. Relevant keywords for their offering include environmental services, engineering, construction management, and software solutions. The company can be categorized under the industry of environmental consulting and engineering. Their customers may include government agencies, technology firms, transportation companies, and utilities. Other relevant keywords include sustainability, safety, and diversity.


5. EDM Services, Inc.

  • Website: edmsvc.com
  • Headquarters: Simi Valley, California, United States
  • Founded: 1990
  • Headcount: 51-200
  • LinkedIn

EDM Services is a certified engineering company that provides expert technical services to various state and local agencies. They offer design review, risk assessment, plan check and inspection services to regulatory bodies. Their mission is to deliver high-quality professional engineering, permitting, procurement, quality control, and project management services in a safe and environmentally conscious manner.


6. Holmes Structures

Holmes Structures is a structural engineering company that focuses on innovative design and maximizing building space. They prioritize technical inquiry and design excellence to push the boundaries of what structures can achieve.


7. ATA Engineering

  • Website: ata-e.com
  • Headquarters: San Diego, California, United States
  • Founded: 2000
  • Headcount: 51-200
  • LinkedIn

ATA Engineering is a company that offers engineering services and software solutions. They specialize in conceptual design, prototype development, and independent design assessment. They also provide technical support and training for their software products.


8. SYSTRA International Bridge Technologies

  • Website: systraibt.com
  • Headquarters: San Diego, California, United States
  • Founded: 2000
  • Headcount: 51-200
  • LinkedIn

SYSTRA IBT is a subsidiary of the SYSTRA Group that provides high-end technical expertise in bridge engineering. They offer specialized engineering services in all facets of bridge design, construction, and maintenance.


9. Group Delta Consultants, Inc.

Group Delta is a civil and geotechnical engineering company that offers a range of services including geotechnical engineering, environmental engineering, materials testing and inspection, and construction support. With over 30 years of experience, they have served clients in both the public and private sectors. Group Delta has offices in Irvine, Torrance, Anaheim, San Diego, and Ontario, as well as accredited laboratories in San Diego and Anaheim.


10. Mkn

MKN Associates is a civil and environmental engineering company specialized in water, wastewater, and reuse solutions. They provide consulting, strategy, and technical information to clients in need of reliable water solutions. With a dedicated and specialized team, MKN offers design-build services and program management to ensure successful project delivery. They are committed to staying informed with the latest industry news, events, and projects.


11. CKC Laboratories, Inc.

  • Website: ckc.com
  • Headquarters: Mariposa, California, United States
  • Founded: 1973
  • Headcount: 11-50
  • LinkedIn

CKC Laboratories, Inc is a trusted provider of EMC testing services. With a team of knowledgeable professionals and a dedication to customer service, they aim to establish lasting relationships with their clients. They offer a wide range of EMC testing services for industries such as automotive, aerospace/avionics, military, and medical. They have multiple facilities equipped with state-of-the-art equipment to ensure accurate and repeatable test results. CKC Labs also provides engineering services, seminars, and dedicated training to help clients meet their EMC compliance needs.


12. Power-Tech Engineers, Inc.

  • Website: ptei.net
  • Headquarters: Walnut, California, United States
  • Founded: 1992
  • Headcount: 11-50
  • LinkedIn

Power-Tech Engineers is an engineering firm established in 1992. They provide specialized services in project management, construction management, quality assurance, and other areas to support the successful execution of their client's projects. They have expertise in electrical utilities, facilities, mining & minerals, oil & gas, telecommunications, transportation, and water/wastewater industries. Their services include engineering design, owner's engineering, project management, construction management, testing and commissioning, and technical services.


13. Siegfried

Siegfried Engineering offers innovative, client-centered solutions in civil and structural engineering, surveying, planning, landscape architecture, and athletic facility design. With over 60 years of experience, Siegfried delivers sound structures built on solid design, balancing deadlines, budgets, and design insight. The company specializes in crafting tailor-made solutions that fulfill client's vision, combining the art and science of landscape architecture to create memorable outdoor spaces.


14. Alisto Engineering Group, Inc.

  • Website: alisto.com
  • Headquarters: Walnut Creek, California, United States
  • Founded: 1992
  • Headcount: 51-200
  • LinkedIn

Alisto Engineering Group is a minority-owned firm providing project management, environmental engineering, corrosion engineering, construction services, and sustainable resource management.


15. TSG Solutions Inc. (now Axim Geospatial)

  • Website: tsgsinc.com
  • Headquarters: Carlsbad, California, United States
  • Founded: 2001
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

TSG Solutions Inc. is a company founded in 2001 that provides solutions and services to enhance customer security, preparedness, and operations. They offer Situational Awareness Services and Solutions, Security and Technology Consulting, and Engineering and Technical Services. Their capabilities include data capture and conversion, software process improvement, help desk support, and training. They specialize in digital mapping, GIS services, software development, and network engineering.


16. Trabus Technologies

  • Website: trabus.com
  • Headquarters: San Diego, California, United States
  • Founded: 2010
  • Headcount: 11-50
  • LinkedIn

TRABUS is a technology company specializing in wireless communications and artificial intelligence. They offer consulting services in Engineering Services, Acquisition & Program Management, and Technical Consulting. Their innovative spectrally efficient peer-to-peer (SEPP) technology enables simultaneous wireless conversations without the need for cell towers. TRABUS also utilizes AI to enhance wireless and provide predictive analytics for industries like Maritime. They have a strong patent portfolio and have been recognized as an innovator in Northern Virginia.


17. Brown and Caldwell

Brown and Caldwell is a company that has been providing vital infrastructure to communities for 75 years. They are committed to environmental sustainability and are 100% employee-owned. They offer services in operations and maintenance, advanced technical solutions, and innovation.


18. Exponent

  • Website: exponent.com
  • Headquarters: Menlo Park, California, United States
  • Founded: 1967
  • Headcount: 501-1000
  • LinkedIn

Exponent is a multidisciplinary consulting firm that provides science-based answers and solutions to businesses. They offer services such as accident investigation, product analysis, regulatory compliance, risk assessment, and technology innovation across various industries.


19. VSolvit

  • Website: vsolvit.com
  • Headquarters: Ventura, California, United States
  • Founded: 2006
  • Headcount: 201-500
  • LinkedIn

VSolvit is a technology company that provides research and development services in the physical, engineering, and life sciences fields. They offer predictive analytics tools, engineering services, program and project management, cyber security solutions, business intelligence/data warehousing expertise, and cloud computing services. Their clients include the Department of Defense, the Department of Agriculture, the Department of Housing and Urban Development, and the Bill & Melinda Gates Foundation.


20. ERG, Inc.

  • Website: erginc.com
  • Headquarters: Campbell, California, United States
  • Founded: 2004
  • Headcount: 51-200
  • LinkedIn

ERG is a staffing agency based in Silicon Valley, specializing in engineering positions and consulting services. They provide both short-term engineering consultants and permanent engineers for various projects. With their technical talent, they help clients meet critical deadlines and stay ahead in the ever-changing technology industry.


21. X-Feds

  • Website: x-feds.com
  • Headquarters: San Diego, California, United States
  • Founded: 2004
  • Headcount: 51-200
  • LinkedIn

X-Feds is a provider of superior engineering, integration, and business and technical consulting services, specializing in solving technical challenges in the national security, intelligence, acquisition, and business services arenas. They offer a range of products and services for both the government and industry clients.


22. Momentum Engineering Corp.

Momentum Engineering is a company offering specialized engineering solutions and services to clients. They provide innovative solutions that help clients enhance their operations and improve efficiency. With a team of experienced engineers, they offer a wide range of services tailored to meet the specific needs of each client.


23. SINAK Corporation

  • Website: sinakcorp.com
  • Headquarters: San Diego, California, United States
  • Founded: 1979
  • Headcount: 11-50
  • LinkedIn

SINAK is a company that provides innovative solutions for various industries. With expertise in technology and engineering, they offer a wide range of products and services to meet the needs of their customers.


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