- Wieland Associates
 - Laguna Hills - Provides acoustical consulting services. - Operation Technology Inc.@
- Lake Forest
- TRI-S Environmental
- Newport Beach - Site closure, ground water, soil, modelling, remediation design, expert witness, risk-based cleanup levels.
- Group Delta Consultants
- Aliso Viejo - Small, minority-owned, geotechnical engineering firm in Southern California with offices in Los Angeles, Orange, and San Diego Counties.
- Soundcoat
- Irvine - Supplier of noise control materials and parts.
- ABC Liovin Drilling, Inc
- Stanton - Offers sampling, well installations, hollow stem auger, rotary, limited access, probing services, and more.
- Tait & Associates, Inc.@
- Hilevel Technology Inc
- Tustin - Manufacturer of digital testers for design verification, production test, and failure analysis applications.
- ARA Engineering, Inc.
- Lake Forest - Offer scientific consultation, engineering analysis, and product development.
- Bechard Long & Associates, Inc.
- Santa Ana - A mechanical, electrical, and plumbing firm. Provide services to architects, facility owners, public agencies, and developers.
- Electrolurgy Inc.
- Irvine - Offers metal finishing services - including anodizing, plating, and painting - and non-destructive testing.
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