I guess they're not worried about the EPA anymore:
As part of its 2015 criminal plea agreement, Duke Energy admitted that bromide discharged into rivers and lakes from its coal ash operations have caused carcinogens to form in downstream drinking water systems. Some of these carcinogens are so dangerous that the U.S. Environmental Protection Agency has set their health protection goal at zero, meaning that people should not be exposed to any level of these pollutants.
Yet instead of taking responsible action to halt these bromide discharges, Duke Energy is proposing to add even more bromides to its coal ash basins, through changes to its coal plant operations. Duke Energy claims that the additional bromides will reduce emissions of mercury from its smokestacks. The utility is choosing this bromide production despite the fact that other modern, widely-used technologies—such as baghouses—are available to control mercury emissions without causing carcinogens downstream.
It's actually no comfort in realizing this is probably happening all over the United States, in the wake of the Trump admin's systematic destruction of the EPA. Hopefully our new DEQ will be able to bring some relief from the inevitable deterioration of our environment, but they've been cut to the bone also.