• American Ground Water Trust An organization that is interested in protecting ground water and providing accurate information to assist public participation in water resources decisions.


• Association of Ground Water Agencies Formed in 1994 by a group of eight Southern California groundwater basin management agencies; incorporated as a nonprofit Public Benefit Corporation in 1995.


• Groundwater Information Center - CA Dept. of Water Resources.
• California's Groundwater - Bulletin 118
• Groundwater Level Data


• Ground Water Protection Council A national non-profit organization whose members are interested in the protection of the nation's groundwater supplies.


• Groundwater Foundation Dedicated to informing the public about groundwater through programs and publications. We make learning about groundwater fun for kids and adults.


• Groundwater Resources Association of California


• The Hydrogeologist's Home Page Links to hydrogeological organizations, software and data repositories, publications, and other sources of information of potential use to hydrogeologist s.


• International Association of Hydrologists - The international groundwater organisation: IAH is a scientific and educational organisation whose aims are to promote research into and understanding of the proper management and protection of groundwater for the common good throughout the world.


• National Ground Water Association


• Office of Ground Water and Drinking Water U.S. EPA


• Sacramento Groundwater Association


• Status of Groundwater Management in California Map produced by Integrated Water Technologies, Inc.


• USGS Ground Water Atlas of the United States - California and Nevada