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

Note: this data release has been deprecated. Please see new data release here: https://doi.org/10.5066/P9Y2HOUJ.

These data were originally released on the Water Mission Area National Spatial Data Infrastructure (NSDI) Node and were migrated to ScienceBase in 2023. This data release has since been identified as a duplicate record stemming from the migration of two distinct offerings of identical data on the NSDI node.

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release.

This map layer contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as polygons. The map layer was developed as part of the effort to produce the maps published at 1:2,500,000 in the printed series "Ground Water Atlas of the United States". The published maps contain base and cultural features not included in these data. This is a replacement for the July 1998 map layer called Principal Aquifers of the 48 Conterminous United States.