- Kleinschmidt Associates
 - Provides hydroelectric, structural and civil/site engineering, water resource, environmental, and hydromechanical services. - Environmental Concern, Inc.
- Nonprofit, non-advocacy corporation specialising in wetlands delineation, mitigation, and construction services.
- Water Resource Associates (WRA)
- Civil and environmental engineering firm, with an emphasis on engineering, water resource management, planning, and environmental science.
- Schnabel Engineering Associates
- Provides speciality geotechnical, environmental, construction monitoring, and water resources consulting services.
- Stone Environmental Inc.
- Helps consultants and companies characterize hazardous waste sites. Environmental services include site investigation, waterloo profiling, applied geographic information systems (GIS), wastewater management, and agrochemical studies.
- VKI Water Quality Institute
- Applied research and consultancy firm delivering services regarding aquatic environmental issues.
- Commonwealth Engineering and Technology, Inc.
- Specialising in water and wastewater engineering and also providing GIS / GPS services, as well as stormwater management, wetlands delineation, and watershed studies.
- Athena Technologies, Inc.
- A geological sampling firm that provides vibracore capabilities for all aquatic and wetland environments, for geotechnical and environmental purposes.
- Limnos Oy
- Specialises in sampling equipment for water and sediment studies.
- Lake and Pond Solutions LLC
- Providing products, sales, and service for hundreds of pond and lake management products.
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