- Justrite Manufacturing Company
 - Des Plaines - Making hazardous material storage products. - Environmental Monitoring and Technologies, Inc.
- Morton Grove - Analyzes sample matrices including air, potable water, wastewater, groundwater, and more.
- Pan America Environmental
- Schaumburg - Designs and manufactures systems and individual components to treat industrial wastewater streams.
- TEI Analytical, Inc.
- Niles - Providing chemical and environmental testing services to industry, governmental units, and research facilities.
- American Environmental International, Inc.
- Arlington Heights - Air pollution control systems and solvent recovery systems for industrial applications. Also developing electricity/steam cogeneration technologies.
- Wild Goose Chase
- La Grange - Provides professional and humane goose control management for businesses and institutions experiencing Canada goose, gull, and migratory bird problems.
- Huff & Huff, Inc.
- La Grange - Multi-disciplined firm providing environmental, civil, and chemical engineering services.
- R.W. Collins Co.
- Chicago - Offers underground tank removal and environmental clean-up services.
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