- Ardea Consulting
 - Woodland - Specialising in environmental toxicology and wildlife. - California Environmental Services
- Citrus Heights - Provides alternative outsourcing solutions to help the owners of underground storage tank facilities meet regulations created by the EPA.
- Ecological Outreach Services
- Grass Valley - Providing environmental and ecological consulting, planning, mitigation, education, and eco-restoration services.
- Global Futures
- Sacramento - Environmental consulting company that specialises in business and environment conflict resolution, environmental policy analysis, and resource efficiency.
- Susan A. Rice and Associates, Inc.
- Grass Valley - Scientific consulting and expert witness services in toxicology, pharmacology, health, nutrition, and related fields.
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