- Bacharach, Inc.
 - Manufacturer of gas detection and combustion analytical test equipment and calibration equipment, testers and tools for the diesel service industry. - Institute of Professional Environmental Practice
- IPEP is the independent, nonprofit certifying body for the Qualified Environmental Professional (QEP) and Environmental Professional Intern (EPI) certifications.
- Kuntze Instruments, Inc.
- Making water treatment and chemical process control instruments.
- Petroclean Environmental Services
- Services include emergency response, UST and waste management, remediation and transportation services, education and training.
- Slogan Engineering
- Provides bulk storage, transfer and reagent feeding systems for wastewater and acid mine drainage treatment systems.
- Thermox
- Maker of flue gas and oxygen analyzer products for flue and industrial gas measurement applications.
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