The following worldwide web sites provide information about hydrology, the study of groundwater, and karst features formed by the dissolution of limestone by the chemical action of groundwater.

http://water.usgs.gov/
The Water Resources of the United States web site from the United States Geological Survey (USGS) is a useful source for general information about water resources, including groundwater.

http://jupiter.agu.org/hydrology/news/resources.html
The American Geophysical Union (AGU) has compiled a categorical listing of web sites related to hydrology.

http://www.thehydrogeologist.com/index.htm
The Hydrologist's Home Page at Penn State University is another resource for obtaining information about the science of hydrology, groundwater data, and groundwater modeling resources available on the internet.

http://gwpc.site.net/
The Groundwater Protection Council maintains this website dedicated to protecting and preserving groundwater resources. This is a good place to find information about recent laws and regulations related to groundwater.

http://www.epa.gov/ow/
The United States Environmental Protection Agency (EPA) office of water homepage. This site contains information about pollution and water quality issues related to groundwater.

http://www.wco.com/~rteeter/waterlib.html
The Water Librarians Homepage. This page has a long list of links for water scientists, engineers, and librarians compiled by a librarian in a California water agency.

http://water.wr.usgs.gov/gwatlas/index.html
The USGS Groundwater Atlas of the United States, Segment 1, California and Nevada, contains maps and detailed information about aquifers in these states.

http://ghrc.msfc.nasa.gov/
The Global Hydrology Resource Center, a division of NASA, provides free access to data about various aspects of the global hydrologic cycle.

http://toxics.usgs.gov/toxics/
Various sites and information about clean up of toxics in surface and ground water.

http://water.usgs.gov/public/wid/html/bioremed.html
Information about using bioremediation to clean up toxics in the soil, surface and ground water.

http://water.wr.usgs.gov/gwatlas/index.html
Ground Water Atlas for the United States. Good general information about aquifers.

http://water.usgs.gov/
Good general web site that has a lot of links to water topics in the United States from the USGS.

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