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/

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

Greek Institute of Geology & Mineral Exploration
Fundamental aim is the geological study of Greece, and the exploration and evaluation of the mineral raw materials (except hydrocarbons) and groundwater resources.
http://www.igme.gr/enmain.htm

Lambda Consult
Lambda Consult, Ruim twee decennia ervaring op het gebied van nationaal en internationaal grondwater- en milieuadvisering
http://www.lambdaconsult.com/

S. S. Exploration Enterprises
Services in groundwater exploration, recharge, rain water harvesting, roof water harvesting, and tube well drilling. Based in India.
http://www.hydroexplore.com/

Monash University Exploration Geophysics
School of Geosciences - Research
http://www.geophysics.monash.edu.au/

TRX Consulting
Description here
http://www.trxconsulting.com

Errol L. Montgomery & Associates, Inc.
Hydrogeologic consulting in exploration, development, use and management of groundwater, recharge, litigation support, site assessment, contamination, and remediation. Offices in Arizona, USA and Chile.
http://www.elmontgomery.net/

Condor Consulting Inc.
Provides general geophysical consulting for minerals exploration, and/or groundwater and environmental assessment, specializing in airborne survey management, processing, interpretation, QC, and safety.
http://www.condorconsult.com/

Canadian Exploration Geophysical Society (KEGS)
A non-profit organization dedicated to furthering the profession of geophysical practice related to mining, environmental and groundwater activities in Canada.
http://www.kegsonline.org/