- Jones & Stokes Associates Environmental Consultants
 - Irvine - Provides natural resource management, planning, and environmental consulting services. Offices in California, Arizona and Washington. - Regenesis Bioremediation Products
- San Juan Capistrano - Manufactures and markets Oxygen Release Compound, which enhances natural bioremediation.
- JWC Environmental
- Costa Mesa
- International Sensor Technology
- Irvine - Stationary and fixed instruments offered, technologies include solid state, IR, PID, catalytic bead, and electrochemical.
- ERST/O'Brien's
- Brea - Capable of managing oil spills, fires, hazmat releases, natural disasters or other emergencies.
- Environmental Equipment Consulting
- Newport Beach - Design and manufacture of pollution control and water separation and recovery systems.
- Lifestream Watersystems Inc.
- Huntington Beach - Manufacturer of water and seawater desalination, reverse osmosis, purification, disinfection, and filtration systems.
- Leisure Time Packaging
- Huntington Beach - Specialises in designing and distributing paper and plastic bags and boxes from already used materials.
- Wilson Environmental Associates
- Irvine - Provides ambient and indoor air quality consulting services.
- KVB, Inc.@
- Irvine
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