Groundwater beneath three coal-fired power plants in Wyoming has tested positive for contaminants according to the Casper Star Tribune.
At the Dave Johnston Power Plant near Glenrock, contaminants found included arsenic and cadmium.
At the Jim Bridger plant northeast of Rock Springs, lead and selenium were found.
And, at the Naughton plant outside of Kemmerer, radium was located.
The toxins occurred beneath the unlined coal-ash disposal ponds.
Coal ash is a byproduct of burning coal in the plants.
Rocky Mountain Power reported the toxins found to state regulators earlier this month. A spokesperson for Rocky Mountain Power says the company will address the issues in early 2019.