CNN:

The Environmental Protection Agency has found high levels of arsenic and heavy metals in two rivers in central Tennessee that are near the site of a spill that unleashed more than a billion gallons of coal waste.

The agency said it found “several heavy metals” in the water in levels that are slightly above safe drinking-water standards but “below concentrations” known to be harmful to humans.

“The one exception may be arsenic,” the agency said in a letter to an affected community. “One sample of river water out of many taken indicated concentrations that are very high and further investigations are in progress.”