Clean Water Act discharge permit · NPDES MTR040007
CITY OF MISSOULA SMALL MS4, Missoula, MT: NPDES MTR040007 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
CITY OF MISSOULA SMALL MS4, held by CITY OF MISSOULA, holds NPDES permit MTR040007, which discharges to Clark Fork River. EPA’s file records it issued February 16, 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 | CITY OF MISSOULA SMALL MS4 |
|---|---|
| Permittee as filed | CITY OF MISSOULA |
| NPDES ID | MTR040007 |
| 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 | February 16, 2017 |
| Expiration date | December 31, 2021 |
| Address | Missoula, MT 59802 |
| Receiving water | CLARK FORK RIVER |
| Subwatershed | Grant Creek (HUC 170102040103) |
| 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
- 10Pollutants on file
- 0Under a numeric limit
- 10With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| pH | 0 | 8 | 0 | ||
| Flow rate | 0 | 5 | 0 | ||
| Solids, total suspended | 0 | 4 | 0 | ||
| Oil and grease, hexane extr method | 0 | 4 | 0 | ||
| Nitrogen, total [as N] | 0 | 4 | 0 | ||
| Phosphorus, total [as P] | 0 | 4 | 0 | ||
| Zinc, total recoverable | 0 | 4 | 0 | ||
| Lead, total recoverable | 0 | 4 | 0 | ||
| Copper, total recoverable | 0 | 4 | 0 | ||
| Chemical Oxygen Demand [COD] | 0 | 4 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTR040007.
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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 15, 2019 | WW Storm Water MS4 - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| May 15, 2019 | WW Storm Water MS4 - Failure to Implement SWPPP/SWMP | 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
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, MTR040007.
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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 MTR040007 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.