Clean Water Act discharge permit · NPDES MTR000015
GREAT FALLS INTERNATIONAL AIRPORT, Great Falls, MT: NPDES MTR000015 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 4Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
GREAT FALLS INTERNATIONAL AIRPORT, held by GREAT FALLS INTL AIRPORT AUTH, holds NPDES permit MTR000015, which discharges to Sun River. EPA’s file records it issued September 10, 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 | GREAT FALLS INTERNATIONAL AIRPORT |
|---|---|
| Permittee as filed | GREAT FALLS INTL AIRPORT AUTH |
| NPDES ID | MTR000015 |
| 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 | September 10, 2018 |
| Expiration date | January 31, 2023 |
| Address | Great Falls, MT 59404 |
| Receiving water | SUN RIVER |
| Subwatershed | Sun River-Wadsworth Park (HUC 100301040907) |
| 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
- 8Pollutants on file
- 4Under a numeric limit
- 8With 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 | 2 | 2 | 0 | ||
| Solids, total suspended | 1 | 2 | 0 | ||
| Flow rate | 0 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 1 | 0 | ||
| Chemical Oxygen Demand [COD] | 1 | 1 | 0 | ||
| Oxygen demand, chem. [low level] [COD] | 0 | 1 | 0 | ||
| Oil and grease visual | 0 | 1 | 0 | ||
| Report due [yrmoda] | 0 | 1 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTR000015.
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 |
|---|---|---|
| February 27, 2024 | WW Storm Water Non-Construction - CWA §308 Failure to submit required permit application info | ST6 |
| February 27, 2024 | WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| February 27, 2024 | WW Storm Water Non-Construction - Failure to Maintain Records | 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, MTR000015.
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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 MTR000015 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.