GSA Hydrogeology Division
- Programs, awards,and 2x/year newsletter of the Geological Society of America Hydrogeology Division.
- http://gsahydrodiv.unl.edu/

National Ground Water Association
- Groundwater scientists and engineers, as well as manufacturers and contractors in the water well industry.
- http://www.ngwa.org/

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

Canadian Ground Water Association
- Organization information and public education material on ground water and wells.
- http://www.cgwa.org/

International Association of Hydrogeologists
- Groundwater all over the world: organization information, journal contents, and links.
- http://www.iah.org/

Illinois Groundwater Consortium
- Working toward providing a scientifically valid basis for agricultural chemical management and regulatory decisions affecting groundwater.
- http://www.siu.edu/worda/igc/