- 3W Companies
 - Diversified group of national firms that offer commercial construction services, environmental testing and remediation, medical facilities development and financing, and commercial/retail glass services. - Advancia Corporation
- Provides professional technical services, information and human performance technologies, applied research, and development.
- Aqua Survey, Inc. (ASI)
- Ecotoxicology company providing laboratory testing, field sampling, and consulting services.
- ATS Environmental
- Specializing in oil and gas tank testing, soil inspections, geoprobe services, and more. Locations throughout the Northeast.
- Clements Associates Inc.
- Offers soil probe lines and soil sampling equipment.
- Estabrooks EZY CHEK Systems
- Tank and line testing equipment for underground storage tanks.
- Integrated Environmental Technology Group
- Specializes in environmental monitoring and planning, wastewater solutions, underground CCTV surveys, GPS and GIS data mapping, underground utility location, and infrastructure surveys.
- Research Environmental and Industrial Consultants Inc.
- Providing laboratory services and monitoring services to private industry and the government.
- Serveron
- Offers turnkey substation transformer monitoring.
- SGS Environmental Services
- Provides network of analytical services to help governments and industry integrate environmental management into their operations.
- St Croix Sensory, Inc.
- Provides odor evaluation and training services.
- Tracer Research Corporation
- Specializes in leak detection for underground and aboveground storage tanks, and pipelines.
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