GeoSystems Analysis, Inc.
GeoSystems Analysis, Inc. has pioneered innovative solutions for industry and government in vadose- and saturated-zone hydrology since 1994.
http://www.gsanalysis.com/

Waterloo Hydrogeologic
groundwater modeling, groundwater modeling software, groundwater modeling training, groundwater protection
http://www.waterloohydrogeologic.com/

Illinois Groundwater Consortium
Working toward providing a scientifically valid basis for agricultural chemical management and regulatory decisions affecting groundwater.
http://www.siu.edu/worda/igc/

International Water Supply Ltd.
Groundwater Engineers, International Water Supply specializes in groundwater exploration, assessment, engineering, design and construction of high capacity water wells ans selection, installation and maintenance of pumping equipment
http://www.iws.ca

Environmental Simulations, Inc.
ESI specializes in Groundwater Modeling Software, Training, and Consulting for the Hydrogeology and Hydrology engineering marketplace
http://www.groundwatermodels.com/

Rockwater Groundwater Consultants
Welcome to Rockwater
http://www.rockwater.com.au/

David T. Snow and Associates
Environmental consultants specializing in geological engineering, nuclear and hazardous waste, water quality and pollution.
http://www.davidtsnowphd.com/

Hydrogeology Research Group, University of Tennessee, Knoxville
The University of Tennessee, Knoxville was founded in 1794 and was designated the state land-grant institution in 1879. The University now has nearly 26,000 students and 400 academic programs.
http://web.utk.edu/~hydro

CertainTech, Inc.
CertainTech Corporation provides the best of information technology and environmental sciences, with a unique combination of skills and vision.
http://www.certaintech.com

California Groundwater Association
A non-profit organization representing over 15,000 members promoting the protection of groundwater resources throughout California.
http://www.groundh2o.org/