National Water-Quality Assessment (NAWQA) Program
Trace Elements National Synthesis Project
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National data on trace elements in water, stream and reservoir bed sediments, and aquatic biota
Arsenic concentration data for 20,043 ground-water samples collected in 1973-2001 from across the U.S.
- Ryker, S.J., Nov. 2001, Mapping arsenic
in groundwater: Geotimes Newsmagazine of the Earth Sciences, v.46 no.11, p.34-36.
- 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, 4 p.
- Focazio, M.J., Welch, A.H., Watkins, S.A., Helsel, D.R., and Horn, M.A., 1999,
A retrospective analysis on the occurrence of arsenic in
ground-water resources of the United States and limitations in drinking-water-supply characterizations:
U.S. Geological Survey Water-Resources Investigations Report 99-4279, 21 p.
***Superseded arsenic data***
Arsenic concentration data for 18,850 ground-water samples collected in 1973-1997 from across the U.S.
Concentration data for arsenic, cadmium, chromium, copper, lead, mercury, nickel, selenium, and zinc in 541 streambed-sediment samples collected in 1992-95 from 20 study areas across the U.S.
- Rice, K.C., 1999, Trace-element concentrations in streambed sediment across the conterminous United
States: Environmental Science and Technology, vol. 33 no. 15, p. 2499-2504.