Yellowstone County contains 228 EPA-regulated facilities, 20 of which are currently flagged for significant noncompliance. The county also hosts 2 Superfund sites and 15 TRI chemical reporters. EPA has assessed $12.3M in lifetime penalties and TRI reporters disclosed roughly 727.3k lb of on-site releases. That facility count is well above the Montana state average of 40 per county.
| Site | City | Status |
|---|---|---|
| Lockwood Solvent Ground Water Plume | Billings | Cleanup underway |
| Billings Pce | Billings | Listed on NPL |
| Facility | City | On-site (lb) | Status |
|---|---|---|---|
| Chs Inc Laurel Refinery | Laurel | 260.8k | Compliant |
| Par Montana, Llc - Billings Refinery | Billings | 156.1k | Compliant |
| Jupiter Sulphur, Llc. - Billings | Billings | 144.8k | Compliant |
| Western Sugar Cooperative | Billings | 76.5k | Sig. violation |
| Phillips 66 - Billings Refinery | Billings | 70.8k | Compliant |
| Montana Sulphur & Chemical Co | Billings | 17.7k | Compliant |
| Jtl Group Billings (Dba - Knife River Billings) | Billings | 420 | Compliant |
| Knife River Billings East Site | Billings | 69 | Compliant |
| Facility | City | Penalties | Last Inspected |
|---|---|---|---|
| Schnitzer Steel Billings | Billings | $1.6M | |
| Western Sugar Cooperative | Billings | $38.0k | 2025-09-02 |
| Zone 4 Pump Station | Billings | $0 | |
| Red Rooster Bar-Treatment Plant For Well 1 | Shepherd | $0 | |
| Hilder Herd Properties Co Maart 3-2 Site | Custer | $0 | 2024-01-29 |
| Yellowstone Energy Power Plant | Billings | $0 | 2025-05-29 |
| Lkq - Foster Auto Parts, Inc. | Billings | $0 | |
| Sysco Montana Inc. | Billings | $0 | 2025-06-13 |
| Callaways Blue Creek Feeders | Billings | $0 | 2021-01-19 |
| Granite Park Water Association | Billings | $0 | |
| Yellowstone Cattle Feeders Llc | Shepherd | $0 | 2023-12-05 |
| Thompson Cattle Company | Billings | $0 | 2020-01-31 |
| Huntley Feeders | Huntley | $0 | 2024-02-06 |
| Razor Creek Farms | Shepherd | $0 | 2026-02-25 |
| Duck Creek Mobile Home Park | Billings | $0 | 2023-03-08 |
| Dean Dairy Fluids Llc | Billings | $0 | |
| Billings Motor Sports Park | Billings | $0 | |
| Worden Ballantine Yellowstone-Tp For Ballentine Pumphouse | Fort Smith | $0 | |
| 21 Mile Ranch | Shepherd | $0 | 2024-02-06 |
| Linlee Lakes Subdivision | Billings | $0 | 2021-12-01 |