This site gives an introduction to hydrogeology and its uses on a general scale.
Although this is a wikipedia page it will give a more in depth look into the hydrogeological world.
This website has countless sources of information concerning hydrogeology and groundwater. This site will give large amounts of information that would be helpful.
This whole site contains loads of information on the environment and groundwater resources and how we can work on the environment.
This site has tons of water data from all around Alabama giving you a look into the water quality of Alabama.