National Water-Quality Assessment
National Analysis of Trace Elements - Arsenic in Ground Water of the US

Data map: 31,350 ground-water arsenic samples collected in 1973-2001

Citation--
Ryker, S.J., Nov. 2001, Mapping arsenic in groundwater: Geotimes v.46 no.11, p.34-36.

Alternate formats--
 PDF in red/yellow/green (1.4 Mb)

Original map--
 The May 2000 data map showed 18,850 ground-water samples collected in 1973-1997. The map below shows 31,350 ground-water samples collected in 1973-2001.

National Analysis of Trace Elements - Arsenic in Ground Water of the US
National Water-Quality Assessment