Groundwater sources under the direct influence of surface water (GUDI) in Pennsylvania - Well status with aquifer-type and physiographic settings

Map showing the spatial distribution of the Pennsylvania Drinking Water Information System Database subset and the Microscopic Particulate Analysis database subset in relation to major aquifer types and physiographic provinces in Pennsylvania.

Detail of fig. 4 from Gross, E.L., Conlon, M.D., Risser, D.W., and Reisch, C.E., 2022, Compilation and evaluation of data used to identify groundwater sources under the direct influence of surface water in Pennsylvania (ver. 2.0, June 2023): U.S. Geological Survey Open-File Report 2022–1023, 41 p., https://doi.org/10.3133/ofr20221023.

Base from U.S. Bureau of the Census, 1:100,000-scale, digital data, 2000; Albers Equal-Area Conic projection: Standard Parallels 40° N and 42° N, Central Meridian -78° W, Latitude of Origin 39°.

Major aquifer type: Carbonate (blue), Crystalline (green), Siliciclastic (pink), and Surficial (yellow).

Physiographic province boundaries in white.

Pennsylvania Department of Environmental Protection 2016 Water Information System database subset of 4,018 sources.

Public water-supply system wells identified as groundwater sources under the direct influence of surface water (GUDI) as red dots. Wells identified as non-GUDI as black dots.

Results of Microscopic Particulate Analysis (MPA) as white-filled circles for MPA risk score of zero and as yellow-filled circles for MPA risk score greater than zero.