- Allwest Remediation, Inc.
 - Anaheim - Environmental engineers, geologists, and general contractors for Southern California. - Brian A. Robinson & Associates
- Tarzana - Family owned and operated geotechnical consulting firm serving southern California.
- C.A. Huff and Associates
- West Covina - Facility planning and industrial engineering consulting services for the Southern California area.
- Flow Science Incorporated
- Pasadena - Consulting engineers specialising in fluid motion and transport, computer modelling, water quality, hydraulics, and hydrodynamics.
- Jeff Coronado Structural Engineering Consultants
- West Covina - Provides services for new and existing structures throughout the western United States.
- MARRS Services, Inc.
- Buena Park - Providing management, engineering, and training services in the public works and environmental fields.
- Navcon Engineering Network
- Fullerton - Focusing on solving problems related to airborne and structureborne noise and vibrations.
- Nonlinear Technologies, Inc.
- Long Beach - Specialising in nonlinear RF and microwave circuits, as well as distortion problems in communications systems.
- Northern Digital, Inc.
- Bakersfield - Providing solutions and systems integration in the technical arena.
- P2S Engineering
- Long Beach - Is a multi-discipline engineering firm specialising in electrical, mechanical and telecommunication design services.
- Roshanian & Associates
- Los Angeles - Electrical and mechanical engineering consulting services include power distribution, lighting, communication and life safety, heating ventilation and air conditioning, and plumbing.
- Software Engineering Consultants, Inc.
- Los Angeles - Provides consulting, training and process improvement services.
- Speck Product Design
- Orange - Product design and development firm creating innovative solutions for the mobile electronics, consumer electronics, medical, and furniture industries.
- Transtech Engineers, Inc.
- Walnut - Services to local, state and federal agencies and the private sector.
- Twining Laboratories of Southern California, Inc.
- Long Beach - Construction inspection, materials testing, and engineering consultation firm.
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