| Polluter | Pollutants | Sources | Emissions |
|---|---|---|---|
| Big Sky Mine | 5 | 31 | 1,194,000.00 |
| Colstrip Energy Ltd Partnership | 79 | 520 | 111,004,368.56 |
| Colstrip Steam Electric Station | 22 | 76 | 101,486,716.63 |
| Rosebud / Colstrip Landfill | 28 | 28 | 845.90 |
| Rosebud County Western Energy Mine | 5 | 75 | 3,108,000.00 |
| Tongue River Lumber Co | 5 | 22 | 0.00 |