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National Water-Quality Assessment (NAWQA) Program

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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.

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***Superseded arsenic data***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.

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