National Water-Quality Assessment (NAWQA)
National Analysis of Trace Elements

National data on trace elements in water, stream and reservoir bed sediments, and aquatic biota

• Arsenic in ground water (20,043 USGS samples)
• Arsenic, cadmium, chromium, copper, lead, mercury, nickel, selenium, and zinc in streambed sediment
• Search all NAWQA data (Oracle interface)
• Data from the USGS National Stream Water-Quality Monitoring Network
• Search all USGS National Water Information System data (NWISweb)

Arsenic concentration data for 20,043 ground-water samples collected in 1973-2001 from across the U.S.

Dataset:

• 6.8 Mb Excel file || 2.8 Mb text file
(Data compiled using the same methods and criteria as for WRI 99-4279, but extending the sampling dates until March 30, 2000.)

Related publications:

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, 4p.

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Superseded: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 concentration data for 18,850 ground-water samples collected in 1973-97 from across the U.S.

Dataset:

• 1.9 Mb text file (Data compiled for WRI 99-4279; sampling dates from 1973-1997.)

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.

Dataset:

• Excel97 workbook, containing one worksheet per study area

Related publications:

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.
Abstract

National Analysis of Trace Elements
National Water-Quality Assessment (NAWQA)