Clean Water Act discharge permit · NPDES MTR10I06F
POLSON AIRPORT IMPROVEMENTS, Polson, MT: NPDES MTR10I06F discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
POLSON AIRPORT IMPROVEMENTS, held by Knife River Corporation, holds NPDES permit MTR10I06F. EPA’s file records it issued March 25, 2026 and expiring February 16, 2027. 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.
What the register holds for POLSON AIRPORT IMPROVEMENTS: its NPDES ID, its permit type and status, its dates, its address in Polson, Montana. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR10I06F.
Identity
| Facility as filed | POLSON AIRPORT IMPROVEMENTS |
|---|---|
| Permittee as filed | Knife River Corporation |
| NPDES ID | MTR10I06F |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Construction stormwater |
| Issued | March 25, 2026 |
| Expiration date | February 16, 2027 |
| Issuing agency | U.S. EPA |
| Address | Polson, MT 59860 |
| Subwatershed | Flathead River-Kerr Dam (HUC 170102080308) |
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 MTR10I06F.
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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MTR10I06F.
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, MTR10I06F.
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- One state — $4,990/year
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How we handle your data → Privacy
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 MTR10I06F there.
Nearby on the register
- Discharge permits in Polson
- Every permit record in Polson, A to Z
- Discharge permits in Montana
- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.