Clean Water Act discharge permit · NPDES MTR040008
MALMSTROM AIR FORCE BASE SMALL MS-4, Malmstrom Afb, MT: NPDES MTR040008 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
MALMSTROM AIR FORCE BASE SMALL MS-4, held by MALMSTROM AIR FORCE BASE, holds NPDES permit MTR040008, which discharges to Missouri River. EPA’s file records it issued January 31, 2017 and expiring December 31, 2021. 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 filed | MALMSTROM AIR FORCE BASE SMALL MS-4 |
|---|---|
| Permittee as filed | MALMSTROM AIR FORCE BASE |
| NPDES ID | MTR040008 |
| 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 | Small municipal storm sewer systems |
| Issued | January 31, 2017 |
| Expiration date | December 31, 2021 |
| Address | Malmstrom Afb, MT 59402 |
| Receiving water | MISSOURI RIVER |
| Subwatershed | Missouri River-Rainbow Dam (HUC 100301021204) |
| SIC | 9511 – Air, Water, & Solid Waste Management |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
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 MTR040008.
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 |
|---|---|---|
| April 27, 2026 | WW Storm Water MS4 - Failure to Maintain Records or Meet Record Keeping Requirements | ST6 |
| April 27, 2026 | WW Storm Water MS4 - Failure to Implement SWPPP/SWMP | ST6 |
| April 27, 2026 | WW Storm Water MS4 - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| April 27, 2026 | WW Storm Water MS4 - Failure to properly install/implement BMPs | ST6 |
| December 6, 2018 | WW Storm Water MS4 - Failure to Monitor | 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.
Watch this permit
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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 MTR040008 there.
Nearby on the register
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- Every permit record in Malmstrom Afb, A to Z
- Discharge permits in Montana
- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.