Illinois Groundwater Consortium - Working toward providing a scientifically valid basis for agricultural chemical management and regulatory decisions affecting groundwater.

International Association of Hydrogeologists - Groundwater all over the world: organization information, journal contents, and links.

Canadian Ground Water Association - Organization information and public education material on ground water and wells.

Wisconsin Ground Water Association - Non-profit volunteer organization advancing understanding of Wisconsin's ground water (scientific, technical, legal, educational, and public policy aspects).

National Ground Water Association - Groundwater scientists and engineers, as well as manufacturers and contractors in the water well industry.