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Concentrations of radium, Cambrian-Ordovician aquifer groundwater

By Water Resources Mission Area
Map showing concentrations of combined radium in groundwater of the Cambrian-Ordovician aquifer at three concentration levels
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Detailed Description

Concentrations of radium in samples of untreated groundwater from the Cambrian-Ordovician groundwater system frequently exceeded the USEPA Maximum Contaminant Level (MCL) of 5 picocuries per liter in Illinois, Iowa, and eastern Wisconsin, where wells tap deeper, older groundwater. From Stackelberg and others, 2018, "Radium mobility and the age of groundwater in public-drinking-water supplies from the Cambrian-Ordovician aquifer system, north-central USA."

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Public Domain.

Radium mobility and the age of groundwater in public-drinking-water supplies from the Cambrian-Ordovician aquifer system, north-