Waterra UK Limited
UK based company manufacturing and selling a range of groundwater monitoring and sampling equipment for use in groundwater investigation, remediation and monitoring programmes.
http://www.waterrauk.com/

Solinst Groundwater Instruments
High quality groundwater monitoring instruments and surface water monitoring instruments including water level meters, interface meters, groundwater samplers, dataloggers and more!
http://www.solinst.com

Ulrick & Associates
Consulting groundwater resource management and modeling, water well siting and design, hydrogeology, hydrology, dewatering, landslide, and drainage expert witness, and monitoring consultant
http://www.ulrick.com/

WASY Ltd.
Firm based in Germany offers groundwater simulation software and related training and support, as well as consulting in groundwater monitoring, management, and protection, surface water management and hydrology. Describes capabilities.
http://www.wasy.de/english/

Cadillac Groundwater Services
Cadillac Groundwater Services, is an international groundwater and environmental consulting firm.
http://www.users.qwest.net/~wlkingston/

Westbay Instruments Incorporated
Westbay Web Portal
http://www.westbay.com/

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/

Kerfoot Technologies
With a new name and a new look! Formerly KVA (K-V Associates, Inc.) Continuing Leadership in groundwater remediation technology.
http://www.kva-equipment.com

GeoInsight
Direct Push and Small Diamater Well Products. No-purge "passive" samplers, flexible bailers, PrePak screens, CMP points and annular seals. - http://www.geoinsightonline.com
http://www.geoinsightonline.com

Ecoseal Developments Pty Ltd
Provides software, groundwater monitoring equipment, and magnetic instruments for environmental, agriculture, mining and education sectors.
http://www.ecoseal.com/