Clean Water Act discharge permit · NPDES MT0031411
WOLF MOUNTAIN COAL, Decker, MT: NPDES MT0031411 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 27Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
WOLF MOUNTAIN COAL, held by WOLF MOUNTAIN COAL INC, holds NPDES permit MT0031411, which discharges to South Fork Monument Creek. EPA’s file records it issued May 21, 2014 and expiring June 30, 2019. 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 | WOLF MOUNTAIN COAL |
|---|---|
| Permittee as filed | WOLF MOUNTAIN COAL INC |
| NPDES ID | MT0031411 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | May 21, 2014 |
| Expiration date | June 30, 2019 |
| Address | Decker, MT 59025 |
| Receiving water | SOUTH FORK MONUMENT CREEK |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 30Pollutants on file
- 27Under a numeric limit
- 19With 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 |
|---|---|---|---|---|---|
| Flow rate | 6 | 44 | 0 | ||
| pH | 6 | 44 | 0 | ||
| Iron, total recoverable | 6 | 44 | 0 | ||
| Temperature, water deg. fahrenheit | 6 | 24 | 0 | ||
| Solids, total suspended | 2 | 24 | 0 | ||
| Specific conductance | 3 | 22 | 0 | ||
| Oil and grease, hexane extr method | 3 | 22 | 0 | ||
| Nitrite + Nitrate total [as N] | 3 | 22 | 0 | ||
| Aluminum, dissolved [as Al] | 3 | 22 | 0 | ||
| Solids, settleable | 2 | 20 | 0 | ||
| Sulfate [as S] | 3 | 12 | 0 | ||
| Nitrogen, ammonia total [as N] | 3 | 12 | 0 | ||
| Copper, total [as Cu] | 3 | 12 | 0 | ||
| Manganese, total [as Mn] | 3 | 12 | 0 | ||
| Aluminum, total [as Al] | 3 | 12 | 0 | ||
| Sodium Absorption Ratio | 3 | 12 | 0 | ||
| Nitrogen, total [as N] | 0 | 10 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 10 | 0 | ||
| Oil and grease visual | 0 | 10 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 3 | 0 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 3 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 0 | 0 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Silver total recoverable | 1 | 0 | 0 | ||
| Zinc, total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Lead, total recoverable | 1 | 0 | 0 | ||
| Chromium, total recoverable | 1 | 0 | 0 | ||
| Copper, total recoverable | 1 | 0 | 0 | ||
| Mercury, total recoverable | 1 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MT0031411.
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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 24, 2020 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| January 24, 2020 | Management Practice Violations - Failure to Conduct Inspections | 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
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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 MT0031411 there.
Nearby on the register
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- Every permit record in Decker, A to Z
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.