- Alliance Environmental Group, Inc.
 - Irwindale - Offering hazardous and microbial, mould/mildew contamination services. - Allwest Geoscience
- Anaheim - Geotechnical engineers and environmental consultants for the Southwestern United States.
- Ami Adini Environmental Consultants & UST Experts
- Los Angeles County - Features California environmental site assessments, phase one and phase two ESA, environmental consulting, and underground storage tank experts.
- Environmental Engineering & Contracting, Inc.
- Tustin - Providing consulting, water reuse, soil groundwater remediation, and construction services.
- Fugro West
- Ventura - Geoscience consulting and marine survey firm offering geotechnical engineering, earthquake engineering, environmental engineering, and construction materials testing.
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