Clean Water Act discharge permit · NPDES MTPIU0001
CALUMET MONTANA REFINING, Great Falls, MT: NPDES MTPIU0001 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
CALUMET MONTANA REFINING, held by Calumet Montana Refining, holds NPDES permit MTPIU0001. EPA’s file records it issued April 12, 2022 and expiring March 31, 2027. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
What the register holds for CALUMET MONTANA REFINING: its NPDES ID, its permit type and status, its dates, its address in Great Falls, Montana. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTPIU0001.
Identity
| Facility as filed | CALUMET MONTANA REFINING |
|---|---|
| Permittee as filed | Calumet Montana Refining |
| NPDES ID | MTPIU0001 |
| Permit status | Effective |
| Permit type | Individual industrial user permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | April 12, 2022 |
| Expiration date | March 31, 2027 |
| Issuing agency | City Of Great Falls Wwtp |
| Address | Great Falls, MT 59404 |
| Receiving water impaired | 303(D) Listed |
| Other EPA IDs (FRS) | RCRA handler MTD000475194; ICIS-AIR source MT0000003001300004 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 0Pollutants on file
- 0Under a numeric limit
- 0With a violation of any kind
- 0With an effluent exceedance
EPA’s limits and effluent violation files hold no pollutant row for NPDES MTPIU0001.
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 MTPIU0001.
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.
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, MTPIU0001.
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 MTPIU0001 there.
Nearby on the register
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.