- Aires Consulting Group
 - Batavia - Liability and risk management, including occupational health and safety, ergonomics, asbestos services, environmental audits, training seminars, lead testing, and indoor air quality. - American Environmental International, Inc.
- Arlington Heights - Air pollution control systems and solvent recovery systems for industrial applications. Also developing electricity/steam cogeneration technologies.
- DuPage Water Conditioning
- West Chicago - Water treatment equipment and supplies for residential and commercial applications.
- Environmental Monitoring and Technologies, Inc.
- Morton Grove - Analyzes sample matrices including air, potable water, wastewater, groundwater, and more.
- HazChem Environmental Corp.
- Addison - Providing solutions for common environmental concerns ranging from waste disposal to site remediation.
- Huff & Huff, Inc.
- La Grange - Multi-disciplined firm providing environmental, civil, and chemical engineering services.
- Justrite Manufacturing Company
- Des Plaines - Making hazardous material storage products.
- Odor Management Inc
- Making an organic odor neutralizer complied of essential oils and surfactants.
- Onyx Environmental Services
- Lombard - Provides a complete range of environmental protection services for industrial customers needing to recycle, treat, or dispose of hazardous waste.
- Pan America Environmental
- Schaumburg - Designs and manufactures systems and individual components to treat industrial wastewater streams.
- Practical Environmental Consultants, Inc. (PEC)
- Roselle - Providing environmental services to individuals, corporations, and municipalities.
- R.W. Collins Co.
- Chicago - Offers underground tank removal and environmental clean-up services.
- Spectrum Technologies, Inc.
- Plainfield - Makers of weather monitoring and soil tesing equipment designed for agricultural applications.
- TEI Analytical, Inc.
- Niles - Providing chemical and environmental testing services to industry, governmental units, and research facilities.
- Vactor Manufacturing
- Streator - Manufacturer of sewer cleaning equipment.
- Water Systems Council
- Glen Ellyn - Trade association whose members represent North American manufacturers and distributors in the water systems industry.
- Wild Goose Chase
- La Grange - Provides professional and humane goose control management for businesses and institutions experiencing Canada goose, gull, and migratory bird problems.
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