Water-level measurements of 229 wells made primarily during November and December 2018 were used to construct two potentiometric surface maps of the Tertiary-age Coastal Plain aquifers in South Carolina: one map of the Upper Floridan and Middle Floridan aquifers, and one of the Gordon aquifer. This report includes well information and water-level data used for the two maps, and a brief discussion about each potentiometric map.

Ground-water levels measured from 109 wells in South Carolina from 2006 through 2010 are statistically analyzed, tabulated, and presented as hydrographs. Five wells are located in the Blue Ridge Province, 13 in the Piedmont, and 91 in the Coastal Plain. Water levels in 63 of the wells were measured hourly with automated data recorders; most of the remaining wells were measured on a bimonthly schedule using hand-held electric measuring tapes. All of the wells are maintained by the South Carolina Department of Natural Resources for water-resource assessments.