Clean Water Act discharge permit · NPDES MTG770010
CENEX LAUREL REFINERY, Laurel, MT: NPDES MTG770010 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
CENEX LAUREL REFINERY, held by CENEX HARVEST STATES, holds NPDES permit MTG770010, which discharges to Yellowstone River. EPA’s file records it issued January 13, 2021 and expiring December 31, 2025. 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 | CENEX LAUREL REFINERY |
|---|---|
| Permittee as filed | CENEX HARVEST STATES |
| NPDES ID | MTG770010 |
| 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 |
| Issued | January 13, 2021 |
| Expiration date | December 31, 2025 |
| Address | Laurel, MT 59044 |
| Receiving water | YELLOWSTONE RIVER |
| Subwatershed | Yellowstone River-Indian Creek (HUC 100700040602) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 11Pollutants on file
- 10Under a numeric limit
- 11With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 1 | 6 | 2 | June 30, 2025 | 600% over the limit |
| Xylene [mix of m+o+p] | 1 | 4 | 1 | October 31, 2018 | 20% over the limit |
| Solids, total suspended | 1 | 7 | 0 | ||
| Oil and grease, hexane extr method | 0 | 6 | 0 | ||
| Flow rate | 2 | 3 | 0 | ||
| Toluene | 1 | 3 | 0 | ||
| Benzene | 1 | 3 | 0 | ||
| Ethylbenzene | 1 | 3 | 0 | ||
| pH | 2 | 2 | 0 | ||
| Oil and grease visual | 1 | 2 | 0 | ||
| Oil & Grease | 1 | 1 | 0 |
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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MTG770010.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MTG770010.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MTG770010 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.