- Transmetrics, Inc.
 - Los Angeles - Provides worldwide transportation planning and construction management services to public sector clients. - RBF
- Irvine - Consulting firm offering engineering, planning, surveying and related professional services to both private and public sector clients.
- RISA Technologies
- Lake Forest - Providing structural engineering software.
- Degenkolb Engineers
- Los Angeles - Structural engineering services from offices in Los Angeles, San Francisco, and Portland.
- Warner Engineering
- Apple Valley - Engineering, planning, and land surveying services.
- Psomas
- Santa Monica - Consulting firm providing services in land development, water resources, surveying, and computerized mapping/data systems.
- EarthWorks Soil Amendments, Inc.
- El Segundo - Offering landscape contractors, architects and developers solutions to soil remediation and management problems.
- Bonadiman Enterprises
- San Bernardino - Civil engineering firm . Specialise in civil, hydraulic, geologic and forensic engineering. Also making hydrology/hydraulic and engineering software.
- Willdan Associates
- Anaheim - Services include transportation planning, flood control and city engineering.
- IPEC Global, Inc.
- Ontario - Providing design and construction of industrial chemical processing and hazardous waste treatment facilities, as well as environmental consulting.
- BBR Surveying Instruments
- Los Angeles - Retailer of surveying equipment and supplies.
- Strand Earthquake Consultants
- Los Angeles - Provide earthquake safety solutions including seismic gas shutoff valves, seismic switches, strong-motion recorders, accelerometers, and seismic monitoring of structures, including highrises and dams.
- AEI-CASC Engineering
- Colton - Providing civil engineering and land surveying services to the infrastructure and building industry.
- White Castle Construction
- Los Angeles - Specialises in residential seismic retrofitting, house bolting, foundation inspection, repair, and more.
- Computer Automated Detailing Design Service (CADDS)
- Fountain Valley - Providing computer-aided structural steel detailing.
- Praad Geotechnical Inc.
- Culver City - Provide consultation, expert guidance, and investigation involving geotechnical issues.
- Ed Sylvis Construction
- Pasadena - Offering earthquake and seismic safety solutions such as foundation bolting, earthquake retrofitting, and sagging floor contracting.
- Pace Engineering, Inc.
- Chatsworth - Provides service in civil engineering, land planning, surveying, entitlements, and investigative/forensic engineering.
- Stanton Land Surveys and Consulting
- Granada Hills - Provides a range of services for residential and commercial properties including subdivision mapping, topographics, boundary surveying, and more.
- General Resins, Inc.
- Villa Park - Offers the centre core system for structural retrofit of under-reinforced masonry buildings.
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