In honor of National Groundwater Awareness Week, March 11-17, 2018, here are some groundwater resources.
Over the last 100 years the USGS collected data from ~850,000 wells. Much of this information, including current data, can be accessed from the groundwater watch website:
https://groundwaterwatch.usgs.gov/
The watercalculator.org site also has a summary of water resources for educators: https://www.watercalculator.org/education/water-resources-for-educators/
The Groundwater Foundation recently published an issue of the "The Aquifer" to inform the public about groundwater issues: https://groundwaterorg.presencehost.net/file_download/inline/2746dde7-d786-4d1c-9c79-0dd19cfbe561