Clean Water Act discharge permit · NPDES MTR000271
HELENA REGIONAL AIRPORT, Helena, MT: NPDES MTR000271 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
HELENA REGIONAL AIRPORT holds NPDES permit MTR000271, which discharges to Prickly Pear Cr - Helena Valley Dit. EPA’s file records it issued May 17, 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 filed | HELENA REGIONAL AIRPORT |
|---|---|
| Permittee as filed | HELENA REGIONAL AIRPORT |
| NPDES ID | MTR000271 |
| 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 | Industrial stormwater |
| Issued | May 17, 2018 |
| Expiration date | January 31, 2023 |
| Address | Helena, MT 59602 |
| Receiving water | PRICKLY PEAR CR - HELENA VALLEY DIT |
| Subwatershed | Lower Prickley Pear Gulch (HUC 100301011310) |
| SIC | 4581 – Airports, Flying Fields, & Services |
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
- 6Pollutants on file
- 0Under a numeric limit
- 6With 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 |
|---|---|---|---|---|---|
| Flow rate | 0 | 5 | 0 | ||
| Oxygen demand, chem. [low level] [COD] | 0 | 4 | 0 | ||
| Solids, total suspended | 0 | 4 | 0 | ||
| Oil and grease visual | 0 | 4 | 0 | ||
| Report due [yrmoda] | 0 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 1 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTR000271.
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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 8, 2024 | WW Storm Water Non-Construction - Failure to properly operate and maintain BMPs | ST6 |
| March 8, 2024 | WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| March 8, 2024 | WW Storm Water Non-Construction - 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, MTR000271.
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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 MTR000271 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.