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Map Layer Info

Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands

What this map layer shows:

Aquifers that supply ground water to the lower 48 States, Hawaii, Puerto Rico, and the U.S. Virgin Islands.
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Background Information
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An aquifer is a geologic formation, group of formations, or part of a formation that contains sufficient saturated, permeable material to yield significant quantities of water to wells and springs. The U.S. Geological Survey Water Resources Program collects information on aquifers and other water resources to determine the quantity and quality of the Nation's water supplies. This information is used by Federal, State, and local agencies for water-resources planning and management. This map layer was compiled by the U.S. Geological Survey.

The Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands map layer shows those aquifers that supply ground water. For each geographic area, the aquifer shown is generally the uppermost principal aquifer. Each principal aquifer is classified as one of six types of permeable geologic material: unconsolidated deposits of sand and gravel, semiconsolidated sand, sandstone, carbonate rocks, interbedded sandstone and carbonate rocks, or basalt and other types of volcanic rock. The aquifer name is also included. Glacial deposits that contain numerous productive aquifers and major alluvial aquifers along main watercourses are not shown. Additional aquifer information is included in the National Atlas Aquifers of Alluvial and Glacial Origin map layer. Information on aquifer types can be found on the Aquifer Basics page, and further water science information is available from the USGS Ground Water Information Pages, from the USGS Learning Web Explorers Water page, and from the Ground Water Atlas of the United States.


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Principal Aquifers
Aquifer Basics Introduction

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Glacial Limits