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Radium in Groundwater Study Area - Cambrian-Ordovician Aquifer

By Communications and Publishing
Map showing where in the Cambrian-Ordovician aquifer groundwater was tested for radium and where levels were high
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Detailed Description

Concentrations of radium in samples of untreated groundwater from the confined parts of the Cambrian-Ordovician groundwater system frequently exceeded the USEPA maximum contaminant level of 5 picocuries per liter in Illinois, Iowa, and eastern Wisconsin, where wells tap deeper, older groundwater.

Sources/Usage

Public Domain.