Ground Water Science
- Performs investigations and planning in water supply hydrogeology and ground water quality, microbiology, and well maintenance for environmental studies and public water supply. Also supply training and publications. Working regionally and internationally
- http://www.groundwaterscience.com/

Crisalis International
- Specializes in groundwater consulting, research and innovation.
- http://www.sub-stance.org/crisalis/

In Aqua Veritas, LLC
- Provides outsourcing services in groundwater fate and transport modeling, risk-based corrective action and remediation by natural attenuation.
- http://iav.broadbrushart.com/

SCS Environmental Consultants, Inc.
- Specializes in groundwater monitoring, phase I and II site assessments, mold sampling, and TCEQ corrective action. Located in The Woodlands, Texas.
- http://www.scsenviro.com/

GEOSCIENCE Support Services, Inc.
- Specializes in ground water planning and development, recharge investigations, flow and solute transport modeling, injection well design, and related environmental services. Southern California, USA.
- http://www.gssiwater.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/

Environmental Services & Consulting, LLC
- HUBzone certified business providing permitting assistance to clients in Virginia and surrounding states. Specializing in water resources.
- http://www.vpdes.com/

Hydrosolutions Pty Ltd
- Hydrogeological and environmental consultancy. Specializing in groundwater investigations, resource development, contaminated site assessment, and remedial design and implementation.
- http://www.hydrosolutions.com.au/

G. Fred Lee & Associates
- Surface and ground water quality evaluation and management. Background information and articles on environmental subjects such as water quality, impact of hazardous chemicals, and wastewater management.
- http://www.gfredlee.com/

Geo-hidro
- Professional hydrogeological services of ground-water supply and engineering projects, Slovenia - Europe
- http://www.geo-hidro.si/

Pacific Groundwater Group
- Water resources and environmental consulting firm based in Seattle, Washington.
- http://www.pgwg.com/

Truchas Hydrologic Associates, Inc.
- New Mexico- based hydrology and water resources firm specializing in evaluations, management, water rights administration and water quality management.
- http://www.truchashydrologic.com/

True North Environmental LLC.
- Provides groundwater prospecting employing fracture trace analysis and high resolution electrical resistivity (ER) imaging.
- http://www.truenorthenv.com/

Laramide Environmental, LLC
- Specializes in groundwater, water quality, and environmental data management. Includes details of past projects. Located in Lakewood, Colorado.
- http://www.laramide-env.com/

HydroTechnics, Inc.
- Manufacturer of the VECTOR groundwater flow monitoring system for in-situ tracking of changes in the full 3-D flow vector over time.
- http://www.hydrotechnics.com/

Southwest Ground-water Consultants
- Arizona hydrogeology consultancy company offering services in water-supply studies, well design, artificial recharge, contamination investigations, and other applications. Includes staff and project profiles.
- http://www.sgcground-water.com/

Oakridge Environmental, Ltd.
- Consulting in hydrogeology, environmental geology, groundwater and surface water supplies, well testing, water quality, testing, contaminants, geophysics, geochemistry, aggregates, exploration. Peterborough, Ontario, Canada.
- http://www3.sympatico.ca/ore/

EarthWater Technology International, Inc.
- Specializes in groundwater exploration and drilling, including supplying fresh water from deep aquifers. Describes capabilities and worldwide experience, including technical papers.
- http://www.watermap.com/

Brunnen und Bohrlochinspektion GmbH
- Provides inspection of water wells, geophysical well logging, material exploration, and drilling services. Gommern, Germany.
- http://www.bbi.de/

Clear Creek Hydrology, Inc.
- Services in groundwater and surface water modeling, hydrology, well installation, hydraulics, restoration, reclamation, and related environmental services. Montana, USA.
- http://www.clearcreekhydrology.com/home.htm

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/

McLane Environmental
- Specializes in ground water flow system analyses, contaminant transport and computer modeling. Pictoral and VRML examples of past projects listed.
- http://www.mclaneenv.com/

CertainTech, Inc.
- Specializes in groundwater treatment and hydrogeologic modeling. Also sells modeling and GIS interface software for groundwater analysis.
- http://www.certaintech.com

Environmental Services Network
- Services in direct push sampling of soil, soil vapor, and groundwater, mobile and laboratory analysis, borehole geophysics, and environmental geochemistry. Also offers environmental seminars and technical papers.
- http://esn-usa.com/

Environmental Simulations International
- Environmental Simulations International provides services in hydrogeology, environmental consulting, groundwater modelling, risk assessment, contaminated land and brownfield development. Also develops groundwater modelling software.
- http://www.esinternational.com/

Alpha Geoscience
- Environmental site assessments and planning, field data collection and analysis, expert testimony, regulatory negotiation, and project implementation for water supply, waste disposal, remediation, mine permitting, and other geology and groundwater applica
- http://www.alphageoscience.com/

Project Dewatering Limited
- Offers development and operation of groundwater control and remediation systems through the world. Describes capabilities and past projects. Offices in Suffolk, Derbyshire and County Durham, UK.
- http://www.project-dewatering.co.uk/

Cadillac Groundwater Services
- Specializes in wellfield development and management, water supply, mine pit dewatering, groundwater monitoring, site assessment, and related services. Includes case histories of past projects. Colorado, USA.
- http://www.users.qwest.net/~wlkingston/

Geothermal Surveys, Inc.
- Specializes in the exploration, development and production of ground water resources, and offers related related geological and hydrological applications. Includes information about thermal survey techniques used and past projects.
- http://www.gsiwater.com/

Advanced Land and Water, Inc.
- Hydrogeological services specializing in water supply development, fractured and karst bedrock groundwater investigations, and land application of wastewater. Maryland, USA.
- http://www.alwi.com/

David T. Snow and Associates
- Groundwater hydrologist offers consulting services worldwide, in areas of groundwater supply, control and disposal, as well as soils and rock engineering, exploration and research.
- http://www.davidtsnowphd.com/

Rockwater Groundwater Consultants
- Western Australia firm. Service areas include locating and developing ground water supplies, mine dewatering, and groundwater contamination control.
- http://www.rockwater.com.au/

GeoSystems Analysis, Inc.
- Services include groundwater contamination studies, regulatory compliance, groundwater resource exploration, recharge studies, groundwater transport modeling, mine waste reclamation, and geotechnical lab testing. Lists past projects and clients. Arizona
- http://www.gsanalysis.com/

RLK Hydro, Inc.
- Hydrology, engineering, and environmental consulting services, specializing in water rights, regulatory compliance, property development, litigation support, and site specific problem solving. Describes personnel and services. Located in Kalispell, Mont
- http://www.rlkhydro.com/

Aquifer Science and Technology
- Professional hydrogeological and geophysical services in support of ground-water supply and engineering projects. Includes past projects and articles on groundwater.
- http://aquiferscience.com/

Adrian Steele
- Independent consultant specializing in groundwater contamination by dense non-aqueous phase liquids (DNAPLs). Clients and publications listed. Based in the UK.
- http://www.dnapl.co.uk/

David Blackmore & Associates
- Geotechnical and environmental engineers. Services include groundwater evaluation, site assessment, waste disposal, and aquifer analysis. Pennsylvania, USA.
- http://www.dbaengineering.com/

Waterstone Environmental Hydrology and Engineering
- Specialities include ground and surface hydrology, numerical code development, water rights, and risk assessment. Located in Boulder, Colorado.
- http://waterstoneinc.com/

P R Marriott Drilling, Ltd.
- Provides drilling, ground water engineering and hydro geological consultancy services. Located in Chesterfield, UK.
- http://www.pr-marriott-drilling.com/

Atlas Dewatering
- Construction dewatering specialists, utilizing vacuum wellpoints, eductor/ejector wells and deep wells for construction and remediation projects involving complex site and soil conditions. North America.
- http://www.atlasdewatering.com/

BBC Environmental, Inc.
- Offers groundwater monitoring and sampling, site assessment, slug testing, remediation, vapor testing, well abandonment studies, and related services. California, USA.
- http://www.bbcenvironmental.com/

Terry Environmental Services
- Specializes in phase I and II environmental site assessments, underground storage tank (UST) closures, remediation support, and subsurface analysis. Located in Charleston, South Carolina, USA.
- http://www.terryenvironmental.com/

Hydrogeological Services International
- Consultants in hydrogeology, water resources and the environment, and computer applications. Based in the United Kingdom.
- http://www.hsiltd.co.uk/

McDonald Morrissey Associates, Inc.
- Specializes in the analysis of complex groundwater flow systems for industrial and government clients. Lists past projects.
- http://www.mcdonaldmorrissey.com/

Beatty & Associates Limited
- Services include monitoring, supply, impact studies, stormwater infiltration, environmental site assessments, landfills, and remediation of contaminant impacts. Located in Bolton, Ontario.
- http://bbeatty.com/

Ejlskov Consult
- Site investigation, environmental due diligence, risk assessment, monitoring, hydrogeology, water quality, and water sampling. Provides services throughout Europe.
- http://www.ejlskov.dk/

Earthward Consulting
- Provides groundwater and contaminant transport modeling, deep well injection, mine dewatering, and environmental visualization services. Includes sample visualizations.
- http://www.earthwardconsulting.com/

Quaternary Resource Investigations, Inc.
- Specializes in geoscience investigations and regulatory compliance issues, focusing on coastal models and regulatory compliance.
- http://www.qri-pulser.com/

ESA Consulting, LLC
- Offers regulatory compliance, litigation support, due diligence, site investigations, and other environmental services in connection with underground storage tanks, contaminated sites, and other soil and groundwater matters. Texas, USA.
- http://www.webesa.com/

John C. Halepaska and Associates, Inc.
- Specializes in environmental assessments, water rights adjudication, ground water exploration, and surface and mining water hydrologic studies. Located in Littleton, Colorado.
- http://www.hydrologyconsultants.com/

TerraGraphics Environmental Engineering, Inc.
- Services include site investigation, groundwater studies, air quality control, risk assessment, solid waste management, and pollution prevention. Located in Idaho, USA.
- http://www.tgenviro.com/

Zephyr Environmental Corporation
- Provides environmental, health, and safety services to industry and government. Located in Texas and Maryland, USA.
- http://www.zephyrenv.com/

Earth Tech
- Provides management, design, and maintenance of groundwater and wastewater systems, environmental compliance, site assessment, and related environmental fields. Lists past projects and contact information for over 200 offices.
- http://www.earthtech.com/

HydroSOLVE, Inc.
- Offers services in aquifer test design and analysis, three-dimensional modeling of groundwater flow and solute transport, software development and professional training.
- http://www.hydrosolveinc.com/hydrosolve/

Shannon & Wilson, Inc.
- Provides a full range of geotechnical and environmental engineering services. Lists clients and past projects.
- http://www.shannonwilson.com

Hazlett-Kincaid, Inc.
- Offers hydrogeologic modeling and data visualization services to scientific and engineering firms involved in earth science and environmental projects. Site displays examples of past work.
- http://www.hydrogeologic.com/

Ulrick & Associates
- Groundwater resource management, hydrogeology, geology, hydrology, drinking supply wells, groundwater modeling, geostatistics, risk assessment, landfills, dewatering, and environmental monitoring. Located in Berkeley, CA.
- http://www.ulrick.com/