- Aqua Science, Inc
 - Columbus - Provider of water treatment speciality chemicals, equipment, and management programmes to industrial/commercial establishments. - Lawhon & Associates, Inc.
- Worthington - Environmental and engineering consulting technical services relating to asbestos, lead, underground storage tanks, soil and groundwater contamination, and indoor air.
- Pro-Terra Environmental Contracting Co.
- Columbus - Specialising in providin remediation and related services to solve your organisation¿s environmental concerns.
- Refuel Environmental Services
- Columbus - Offers environmental services such as underground fuel storage tank cleaning, fuel filtering, and floor drain cleaning.
- Rickly Hydrological Company
- Columbus - Manufactures equipment for stream gaging, sediment sampling, and stage measurement.
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