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Figure 2. A map of the US showing available data on arsenic concentrations (μg/L or ppb) as of 2001 from samples of groundwater. Note that orange or red dots denote concentrations higher than that allowed in drinking water by US EPA regulations.
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Water Science and Society:Student Materials.

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Source: <a href="http://water.usgs.gov/nawqa/trace/arsenic/" target="_blank">U.S. Geological Survey</a>
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