Skip to main content
U.S. flag

An official website of the United States government

Arsenic concentrations in U.S. groundwater well networks

Detailed Description

Map showing median concentrations of arsenic in groundwater well networks across the U.S. Arsenic was detected more frequently and at higher concentrations in wells in the West than in the East. Figure is from USGS Circular 1360, Water Quality in Principal Aquifers of the United States, 1991-2010.