National Water-Quality Assessment
National Analysis of Trace Elements - Publications

Figure 1
from Fact Sheet 063-00, Arsenic in Ground-Water Resources of the United States

This map has been superseded. A new map was published in the November 2001 issue of Geotimes. The original map, below, showed 18,850 ground-water samples. The new map shows 31,350 samples.

Figure 1. Arsenic concentrations in ground water of the United States.

Citation:
Welch, A.H., Watkins, S.A., Helsel, D.R., and Focazio, M.F., 2000, Arsenic in ground-water resources of the United States: U.S. Geological Survey Fact Sheet 063-00, 4p.

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National Analysis of Trace Elements - Publications
National Water-Quality Assessment