The Environmental Protection Agency plans to address possible Clean Water Act violations by Duke Energy at its power plants, specifically one involved in the spill of toxic coal ash last month.
EPA will join North Carolina regulators in investigating the potential violations, the agency said late last week, according to the New York Times.
North Carolina Gov. Pat McCrory, and state regulators, have come under scrutiny from conservation groups over regulation of Duke.
The recent Dan River spill ignited further frustration as roughly 82,000 tons of coal ash spilled over 70 miles of the river bottom. The spill spurred a federal grad jury to open an investigation into the relationship between the state environmental department and Duke.