"Almost all shallow groundwater in Pennsylvania reaches a stream within days, weeks, or months after the water enters the groundwater system."—Page 17, in The Geology of Pennsylvania's Groundwater, ES3.



Groundwater Education

Learn more about groundwater: The Geology of Pennsylvania's Groundwater (Pennsylvania Geological Survey Educational Series 3), iConserve videos by Survey staff on groundwater and water wells, and more.



Pennsylvania Groundwater Data and Reports

Since the 1930s, the Survey has developed regional and statewide datasets and reports on groundwater. These water resource reports cover much of the state and are now available online.




Private Water Wells

Over a million private water supply wells are used in Pennsylvania.  More information is provided here for wellowners, drillers, and those interested in water wells.




Recent Releases

Recently released groundwater reports and data products from the Pennsylvania Geological Survey are listed here.



PA Water Resources

Links are provided here to information on a wide variety of water topics that are related to groundwater, and to organizations that are involved with groundwater.