- David T. Snow, Ph.D. and Associates
 - Hydrogeologic and geotechnical engineering consulting. - Geo Scientific Ltd.
- Supplier of environmental monitoring instrumentation and GPS including hydrology, hydrogeology, and meteorology monitoring systems.
- Groundwater Environmental Group
- Conducts property transfer and contamination assessments and environmental audits of commercial, industrial, agricultural and residential sites, and applied hydrologic studies.
- HydroData, LLC.
- Offers hydrographic surveying, stream gaging, and sediment measurements data.
- LMNO Engineering, Research, and Software, Ltd.
- Providing hydraulic analysis and design tools for open channel and pressurized pipe flow to registered users. Also with general hydraulic engineering information.
- SchlumbergerSema Integrated Water Solutions (IWS)
- Provides products and services for the development, surveillance, and management of groundwater resources. Also deploys ground-penetrating radar technology for 3D underground images.
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