Clean Water Act discharge permit · NPDES MTG010233
THOMPSON CATTLE COMPANY, Billings, MT: NPDES MTG010233 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
THOMPSON CATTLE COMPANY, held by THOMPSON CATTLE CO, holds NPDES permit MTG010233, which discharges to Dry Creek. EPA’s file records it issued October 19, 2021 and expiring October 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | THOMPSON CATTLE COMPANY |
|---|---|
| Permittee as filed | THOMPSON CATTLE CO |
| NPDES ID | MTG010233 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Concentrated animal feeding operations |
| Issued | October 19, 2021 |
| Expiration date | October 31, 2023 |
| Address | Billings, MT 59101 |
| Receiving water | DRY CREEK |
| Subwatershed | Yellowstone River-Sevenmile Creek (HUC 100700070403) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 10Pollutants on file
- 0Under a numeric limit
- 10With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 0 | 4 | 0 | ||
| Solids, total suspended | 0 | 4 | 0 | ||
| Nitrogen, total [as N] | 0 | 4 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 4 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 4 | 0 | ||
| Phosphorus, total [as P] | 0 | 4 | 0 | ||
| E. coli, MTEC-MF | 0 | 4 | 0 | ||
| pH | 0 | 2 | 0 | ||
| Duration | 0 | 2 | 0 | ||
| Volume, total | 0 | 2 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTG010233.
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 11, 2026 | WW CAFO - Failure to Maintain Records or Meet Record Keeping Requirements | ST6 |
| June 11, 2026 | WW CAFO - Improper Mortality Management | ST6 |
| June 11, 2026 | WW CAFO - Management Practice Violations - Failure to Develop or Update NMP | ST6 |
| June 11, 2026 | WW CAFO - Best Management Practice Deficiencies | ST6 |
| January 31, 2020 | WW CAFO - Best Management Practice Deficiencies | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MTG010233 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.