| American Ground Water Trust: Promotes public awareness of groundwater. Information on nonpoint-source pollution and its prevention, upcoming educational workshops and conferences, and publications available from AGWT. |
| British Columbia Ground Water Association: Provides professional and technical leadership in the advancement of the ground water industry and in the protection, promotion and responsible development and use of ground water resources. |
| California Groundwater Association: A non-profit organization representing over 15,000 members promoting the protection of groundwater resources throughout California. |
| Groundwater Resources Association of California: Nonprofit organization for the protection, preservation, improvement of California ground water against pollution. Site has information about the organization and its activities, job announcements, and related material. |
| Hellenic Committee of Hydrogeology: A scientific committee of the Hellenic Geological Society. Provides publications, news, and workshop schedules. |
| Karst Waters Institute: Mission is to improve the fundamental understanding of karst water systems. |
| Ontario Ground Water Association: Represents well drillers, pump installers, manufacturers, suppliers, scientists, and engineers. Site includes information about groundwater and applicable laws and regulations in the province. |
| Protocols for the ASsessment and Conservation of Aquatic Life In the Subsurface: Research project supported by the European Commission under the Fifth Framework Program. Studying the biological diversity in subsurface water. |
| The Groundwater Protection Council: The GWPC is a nonprofit organization dedicated to the protection of U.S. ground water. |
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