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Clean Water Act discharge permit · NPDES MTR000556

CALUMET MONTANA REFINING LLC, Great Falls, MT: NPDES MTR000556 discharge permit, effluent exceedances, inspections, penalties

CALUMET MONTANA REFINING LLC holds NPDES permit MTR000556, which discharges to Missouri River. EPA’s file records it issued June 12, 2018 and expiring January 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedCALUMET MONTANA REFINING LLC
Permittee as filedCALUMET MONTANA REFINING LLC
NPDES IDMTR000556
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial stormwater
IssuedJune 12, 2018
Expiration dateJanuary 31, 2023
AddressGreat Falls, MT 59405
Receiving waterMISSOURI RIVER
Receiving water impaired303(D) Listed
SubwatershedMissouri River-Great Falls (HUC 100301021201)
SIC2911 – Petroleum Refining
Other EPA IDs (FRS)RCRA handler MTD000475194; ICIS-AIR source MT0000003001300004

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES MTR000556.

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

DateWhat EPA recordedAgency
April 21, 2026WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMPST6
April 21, 2026WW Storm Water Non-Construction - Failure to Maintain RecordsST6
April 21, 2026WW Storm Water Non-Construction - Failure to properly operate and maintain BMPsST6
April 21, 2026WW Storm Water Non-Construction - Failure to properly install/implement BMPsST6
April 13, 2017WW Storm Water Non-Construction - Failure to Conduct InspectionsST6
April 13, 2017WW Storm Water Non-Construction - Failure to properly install/implement BMPsST6
April 13, 2017WW Storm Water Non-Construction - Failure to properly operate and maintain BMPsST6
March 17, 2017WW Storm Water Non-Construction - CWA §308 Failure to submit required permit application infoST6
March 14, 2017WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMPST6

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 MTR000556 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES MTR000556, held by CALUMET MONTANA REFINING LLC of Great Falls, MT, which discharges to the MISSOURI RIVER and is administratively continued. The page lists 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance, and records the permit as issued June 12, 2018 and expiring January 31, 2023.