In Indiana 15 power plants reported groundwater monitoring under the CCR Rule. All 15 have contamination of the groundwater so that it exceeds one or more health-based standards, and the groundwater has been rendered unfit for human consumption. Of the 15 power plants,
- 80% have contamination with molybdenum, half of which exceed the molybdenum health advisory for drinking water by 20-fold or more
- 80% have contamination with sulfate, the highest being 30 times the health advisory
- 73% have contamination with boron, 80% of those exceed the health advisory for boron by 3-fold or more
- Two-thirds have arsenic levels that exceed the drinking water standard by 2-fold or more
- Half of them have contamination with lithium
- One third have contamination with cobalt and one third with radioactive radium
- On average, each power plant has 5 contaminants that exceed safe levels in drinking water
| Power Plant | Contaminants exceeding a drinking water or health standard |
| Bailly | As, Cd, Li, Mo |
| Brown | As, B, Co, Li, Mo, Ra, sulfate |
| Cayuga | Sb, As, B, Pb, Mo, sulfate |
| Clifty Creek | As, B, Co, Li, Mo, Ra, sulfate |
| Culley | As, B, Co, Pb, Li, Mo, sulfate |
| Eagle Valley | As, B, Pb, Mo, sulfate |
| Gallagher | As, B, Pb, Mo, sulfate |
| Gibson | As, B, Pb, Mo, sulfate |
| Harding Street | Sb, As, B, Li, Mo, sulfate |
| Merom | Pb |
| Michigan City | As, Li, sulfate, Tl |
| Petersburg | Sb, As, B, Cd, Co, Li, Mo, Ra, sulfate |
| Rockport | As, Ra |
| Schahfer | As, B, Li, Mo, Ra, sulfate |
| Wabash | As, B, Co, Pb, Li, Mo, sulfate |
Taken from the 2017 annual groundwater monitoring reports filed for Indiana coal-fired power plants by Duke Energy, Indianapolis Power and Light, Indiana-Kentucky Electric Corp, Indiana-Michigan Power, Hoosier Energy, Northern Indiana Public Service Company, and Vectren. The reports are available via links to the utilities’ CCR pages from https://www.in.gov/idem/landquality/2503.htm