Clean Water Act discharge permit · NPDES MT0023965
WESTERN ENERGY CO - ROSEBUD MINE, Colstrip, MT: NPDES MT0023965 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 30Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
WESTERN ENERGY CO - ROSEBUD MINE, held by WESTERN ENERGY COMPANY, holds NPDES permit MT0023965, which discharges to Several Streams And Creeks. EPA’s file records it issued September 10, 2019 and expiring December 31, 2024. 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 | WESTERN ENERGY CO - ROSEBUD MINE |
|---|---|
| Permittee as filed | WESTERN ENERGY COMPANY |
| NPDES ID | MT0023965 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | September 10, 2019 |
| Expiration date | December 31, 2024 |
| Address | Colstrip, MT 59323 |
| Receiving water | SEVERAL STREAMS AND CREEKS |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Headwaters East Fork Armells Creek (HUC 101000011001) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 34Pollutants on file
- 30Under a numeric limit
- 25With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 164 | 29 | 9 | September 30, 2023 | 1,306% over the limit |
| Iron, total [as Fe] | 236 | 20 | 2 | September 30, 2017 | 7,014% over the limit |
| Solids, settleable | 38 | 4 | 2 | May 31, 2024 | 19,500% over the limit |
| pH | 240 | 21 | 1 | July 31, 2024 | |
| Conductivity | 161 | 12 | 1 | April 30, 2022 | 76% over the limit |
| Selenium, total [as Se] | 219 | 24 | 0 | ||
| Flow rate | 240 | 18 | 0 | ||
| Boron, total [as B] | 236 | 18 | 0 | ||
| Sulfate | 236 | 16 | 0 | ||
| Solids, total dissolved [TDS] | 220 | 16 | 0 | ||
| Nitrite + Nitrate total [as N] | 158 | 13 | 0 | ||
| Aluminum, dissolved [as Al] | 173 | 11 | 0 | ||
| Chloride [as Cl] | 154 | 11 | 0 | ||
| Oil and grease, hexane extr method | 120 | 11 | 0 | ||
| Oil & Grease | 0 | 8 | 0 | ||
| Sodium adsorption ratio | 95 | 7 | 0 | ||
| Silver total recoverable | 100 | 4 | 0 | ||
| Mercury, total recoverable | 100 | 2 | 0 | ||
| Nitrogen, total [as N] | 50 | 2 | 0 | ||
| Phosphorus, total [as P] | 50 | 2 | 0 | ||
| Sodium Absorption Ratio | 39 | 2 | 0 | ||
| Specific conductance | 0 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 2 | 0 | ||
| Discharge event observation [Visual Monitoring] | 0 | 2 | 0 | ||
| Cadmium, total recoverable | 100 | 1 | 0 | ||
| Arsenic, total recoverable | 100 | 0 | 0 | ||
| Nickel, total recoverable | 100 | 0 | 0 | ||
| Zinc, total recoverable | 100 | 0 | 0 | ||
| Lead, total recoverable | 100 | 0 | 0 | ||
| Chromium, total recoverable | 100 | 0 | 0 | ||
| Copper, total recoverable | 100 | 0 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 10 | 0 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 10 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 0 | 0 |
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 MT0023965.
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, MT0023965.
Start the watch
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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 MT0023965 there.
Nearby on the register
- Discharge permits in Colstrip
- Every permit record in Colstrip, 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.