Clean Water Act discharge permit · NPDES MTG770036
MALMSTROM AFB HYDRANT DISCHARGE, Malmstrom Afb, MT: NPDES MTG770036 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 1Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
MALMSTROM AFB HYDRANT DISCHARGE, held by MALMSTROM AIR FORCE BASE, holds NPDES permit MTG770036, which discharges to Whitmore Ravine To Missouri River. EPA’s file records it issued January 8, 2016 and expiring December 31, 2020. 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.
Identity
| Facility as filed | MALMSTROM AFB HYDRANT DISCHARGE |
|---|---|
| Permittee as filed | MALMSTROM AIR FORCE BASE |
| NPDES ID | MTG770036 |
| 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 8, 2016 |
| Expiration date | December 31, 2020 |
| Address | Malmstrom Afb, MT 59402 |
| Receiving water | WHITMORE RAVINE TO MISSOURI RIVER |
| Subwatershed | Missouri River-Rainbow Dam (HUC 100301021204) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 4Pollutants on file
- 1Under a numeric limit
- 4With 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 | 6 | 4 | 4 | April 30, 2024 | 320% over the limit |
| Oxidants released, total residual | 0 | 2 | 2 | May 31, 2013 | 1,200% over the limit |
| Flow rate | 0 | 4 | 0 | ||
| pH | 0 | 4 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 6, 2018 | Reporting Violations - Improper/ Incorrect Reporting | 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 MTG770036 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.