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USGS Groundwater Information

Groundwater Resources Program

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 [Photo: Ground water flowing out of well.]

New & Noteworthy

* Press Release: Study Explores Groundwater and Geothermal Energy in Drought-Stricken Eastern Oregon and Neighboring States

* Technical Announcement: USGS Issues Revised Framework for Hydrogeology of Floridan Aquifer

* Press Release: High Plains Aquifer Groundwater Levels Continue to Decline

* Regional Groundwater Availability Study Geospatial Data

* Press Release: USGS Assesses Current Groundwater-Quality Conditions in the Williston Basin Oil Production Area

Past listings...

USGS Groundwater Watch

USGS maintains a network of active wells to provide basic statistics about groundwater levels.

 [Image: USGS active water level wells location map.]

Other Water Topics

*  Water Resources

*  Groundwater

*  Surface Water

*  Water Quality

*  Water Use

USGS in Your State

USGS Water Science Centers are located in each state.

 [Map: There is a USGS Water Science Center office in each State.] Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii and Pacific Islands New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.


A Report to Congress

November 30, 1998



  1. Ground water is an important source of drinking water in every State. (Map)
  2. In the conterminous United States, 24 regions were delineated where the
    interactions of ground water and surface water are considered to have
    similar characteristics. (Map)
  3. Diagram of a cross section of ground-water flow to a stream illustrating
    various effects of ground-water development. (Diagram)
  4. From 1978-95, the USGS intensively studied 25 regional aquifers as part
    of the Regional Aquifer-System Analysis (RASA) Program. (Map)
  5. Availability of an adequate supply of freshwater is a significant issue
    affecting continued economic growth of cities and towns in the Southwest,
    which also contains of the most productive agricultural lands in the
    United States. (Diagram)
  6. The High Plains aquifer covers eight States in the central United States. (Map)
  7. Sand and gravel aquifers in areas that underwent continental glaciation
    (such as much of Illinois, Indiana, and Ohio) and in alluvium along rivers
    (such as the Ohio River) are important sources of ground water. (Map)
  8. Understanding wetland hydrology will be improved if the relationships
    between ground water and wetlands are more clearly established. (Map)
  9. Development of ground-water resources along the Atlantic coast has
    caused saltwater to intrude many highly productive freshwater aquifers. (Map)
  10. (A) Much of the Nation is underlain by carbonate rocks or gypsum that are
    exposed at the land surface or are in the zone of active ground-water
    circulation. (B) In many areas, these rocks, which are slowly soluble to
    ground water develop caves and other karst features, making it
    particularly difficult to evaluate ground-water conditions. (Map & Diagram)
  11. Hydrogeologic environments throughout the United States are highly
    varied and include many complex settings in which it is difficult to
    characterize the availability and sustainability of ground-water resources. (Map)


  1. USGS Ground-Water Resources Program and general ground-water resource investigations--Past, present and potential future activities.

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