| Polluter | Pollutants | Sources | Emissions |
|---|---|---|---|
| Custer County Solid Waste Trenchfill | 28 | 28 | 1,343.86 |
| Mdu - Miles City | 5 | 12 | 12,000.00 |
| Philip Services Corp. - Industrial Services Group | 6 | 24 | 4,000.00 |
| Trinity Industries, Inc. | 2 | 6 | 14,000.00 |
| Williston Basin - Hathaway Station | 6 | 18 | 90,000.00 |