Chromium-6

A study shows potentially dangerous levels of Chromium-6 in wells across the state.
Kelly Stemcosky / Flickr Creative Commons

Researchers at Duke University have found widespread contamination of North Carolina well-water with hexavalent chromium. Researchers initially believed the cancer-causing toxin was coming from coal ash ponds. But Duke professor Avner Vengosh said his new study shows the dangerous compound is naturally occurring across the state.