Radium in Groundwater Study Area - Cambrian-Ordovician Aquifer

Map showing where in the Cambrian-Ordovician aquifer groundwater was tested for radium and where levels were high

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.


Image Dimensions: 2161 x 1707

Location Taken: US