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](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/Figure%20communication%20plan%20v2.png?itok=8eYXWmg6)
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.