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.
- http://serv-umr5023.univ-lyon1.fr/~pascalis/

Hellenic Committee of Hydrogeology
- A scientific committee of the Hellenic Geological Society. Provides publications, news, and workshop schedules.
- http://www.iah-hellas.geol.uoa.gr/

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

The Groundwater Protection Council
- The GWPC is a nonprofit organization dedicated to the protection of U.S. ground water.
- http://www.gwpc.org/

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.
- http://www.ogwa.ca/

Karst Waters Institute
- Mission is to improve the fundamental understanding of karst water systems.
- http://www.karstwaters.org/

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.
- http://www.bcgwa.org/

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.
- http://www.grac.org/

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.
- http://www.agwt.org/