Clean Water Act discharge permit · NPDES MTG010150
DUNCAN RANCH COLONY, Harlowton, MT: NPDES MTG010150 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
DUNCAN RANCH COLONY holds NPDES permit MTG010150, which discharges to Musselshell River. EPA’s file records it issued August 18, 2020 and expiring October 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 | DUNCAN RANCH COLONY |
|---|---|
| Permittee as filed | DUNCAN RANCH COLONY |
| NPDES ID | MTG010150 |
| 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 | Concentrated animal feeding operations |
| Issued | August 18, 2020 |
| Expiration date | October 31, 2023 |
| Address | Harlowton, MT 59036 |
| Receiving water | MUSSELSHELL RIVER |
| Subwatershed | Musselshell River-Dawson Ranch Colony (HUC 100402011002) |
| SIC | 0213 – Hogs |
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
- 12Pollutants on file
- 0Under a numeric limit
- 12With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 0 | 8 | 0 | ||
| Solids, total suspended | 0 | 8 | 0 | ||
| Phosphorus, total [as P] | 0 | 8 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 5 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 5 | 0 | ||
| Coliform, fecal general | 0 | 5 | 0 | ||
| Precipitation volume | 0 | 5 | 0 | ||
| pH | 0 | 3 | 0 | ||
| Nitrogen, total [as N] | 0 | 3 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 3 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 3 | 0 | ||
| E. coli, MTEC-MF | 0 | 3 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTG010150.
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 MTG010150.
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
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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 MTG010150 there.
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.