Clean Water Act discharge permit · NPDES MTR111972
ELECTRIC SUBSTATION: GREAT FALLS - HIGHWOOD, Great Falls, MT: NPDES MTR111972 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
ELECTRIC SUBSTATION: GREAT FALLS - HIGHWOOD, held by NorthWestern Energy, holds NPDES permit MTR111972, which discharges to Box Elder Creek. EPA’s file records it issued July 31, 2026 and expiring December 31, 2027. 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.
What the register holds for ELECTRIC SUBSTATION: GREAT FALLS - HIGHWOOD: its NPDES ID, its permit type and status, its dates, its address in Great Falls, Montana, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR111972.
Identity
| Facility as filed | ELECTRIC SUBSTATION: GREAT FALLS - HIGHWOOD |
|---|---|
| Permittee as filed | NorthWestern Energy |
| NPDES ID | MTR111972 |
| 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 | July 31, 2026 |
| Expiration date | December 31, 2027 |
| Address | Great Falls, MT 59405 |
| Receiving water | BOX ELDER CREEK |
| Subwatershed | Lower Box Elder Creek (HUC 100301021003) |
| SIC | 1731 – Electrical Work |
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
- 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 MTR111972.
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 MTR111972.
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, MTR111972.
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- One watershed — $2,990/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 MTR111972 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.