In Indiana, there is no regulation of private well water.  Well owners are responsible for their own safety when using private well water.

To be on the safe side, HEC recommends getting a well tested if it is within one mile of a coal ash disposal site. The water should be tested for Arsenic, Boron, Cobalt, Lead, Lithium, Molybdenum and Radium. Almost every coal ash disposal site examined so far had exceedances of at least one of these health-based standards in the groundwater. View the complete list of potential coal ash contaminants. Nitrate and bacteria don’t come from coal ash, but as long as you are testing your well, test for them, too.  It is important to test wells for nitrate and bacteria regularly.