Clean Water Act discharge permit · NPDES MTR000399
RAVALLI COUNTY AIRPORT, Hamilton, MT: NPDES MTR000399 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
RAVALLI COUNTY AIRPORT, held by RAVALLI COUNTY COMMISSIONERS, holds NPDES permit MTR000399, which discharges to Gird Creek. EPA’s file records it issued August 8, 2018 and expiring January 31, 2023. 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 | RAVALLI COUNTY AIRPORT |
|---|---|
| Permittee as filed | RAVALLI COUNTY COMMISSIONERS |
| NPDES ID | MTR000399 |
| 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 | August 8, 2018 |
| Expiration date | January 31, 2023 |
| Address | Hamilton, MT 59840 |
| Receiving water | GIRD CREEK |
| Subwatershed | Bitterroot River-Woodside (HUC 170102051007) |
Cited to the EPA ICIS-NPDES permit file (ECHO 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 MTR000399.
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 |
|---|---|---|
| March 23, 2022 | WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| March 23, 2022 | WW Storm Water Non-Construction - Failure to Maintain Records | ST6 |
| March 23, 2022 | WW Storm Water Non-Construction - Failure to properly install/implement BMPs | ST6 |
| March 23, 2022 | WW Storm Water Non-Construction - Failure to Conduct Inspections | ST6 |
| March 23, 2022 | WW Storm Water Non-Construction - Failure to properly operate and maintain BMPs | 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, MTR000399.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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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 MTR000399 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.