Map of Arsenic concentrations in groundwater of the United States

Release Date

2011-11-30

Publication Date

2023-09-15

Gronberg, J.M., 2011, Map of Arsenic concentrations in groundwater of the United States: U.S. Geological Survey data release, https://doi.org/10.5066/P97KZQFV.

Type: Related Primary Publication Type: browseImage

This map graphic image illustrates an arsenic point map created as an update to figure 1 from Ryker (2001) because the legend from figure 1 was found to be ambiguous; value ranges, in micrograms per liter, for each color overlapped at the end points (dark green: 1-3, light green: 3-5, yellow: 5-10, orange: 10-50, red: at least 50). Reproduction of the map revealed that the actual legend should be dark green: less than 3, light green: 3 to less than 5, yellow: 5 to less than 10, orange: 10 to less than 50, red: at least 50. The legend and map were updated to more clearly identify points exceeding the U.S. Environmental Protection Agency arsenic Maximum Contaminant Level of 10 micrograms per liter (dark green: less than or equal to 3, light green: greater than 3 to less than or equal to 5, yellow: greater than 5 to less than or equal to 10, orange: greater than 10 to less than or equal to 50, red: greater than 50). The digital (excel and text and GIS) files contain 20,043 samples with station identification, location in latitude and longitude, well depth, and arsenic concentrations collected by the USGS.

• Model Data Management Function (MDMF)