Clean Water Act discharge permit · NPDES MT0024210
DECKER COAL CO (EAST MINE), Decker, MT: NPDES MT0024210 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 42Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
DECKER COAL CO (EAST MINE), held by DECKER COAL COMPANY, holds NPDES permit MT0024210, which discharges to Tongue River Reservoir. EPA’s file records it issued September 28, 2006 and expiring October 31, 2011. 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 | DECKER COAL CO (EAST MINE) |
|---|---|
| Permittee as filed | DECKER COAL COMPANY |
| NPDES ID | MT0024210 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | September 28, 2006 |
| Expiration date | October 31, 2011 |
| Issuing agency | MONTANA DEQ |
| Address | Decker, MT 59025 |
| Receiving water | TONGUE RIVER RESERVOIR |
| Subwatershed | Tongue River-Pearson Creek (HUC 100901010501) |
| SIC | 1221 – Bituminous Coal And Lignite - Surface |
| Other EPA IDs (FRS) | RCRA handler MTD058861261 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 42Pollutants on file
- 42Under a numeric limit
- 4With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Iron, total [as Fe] | 2 | 5 | 1 | July 31, 2003 | 43% over the limit |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 1 | 3 | 1 | December 31, 2005 | |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 1 | 2 | 1 | March 31, 2001 | |
| Flow rate | 2 | 4 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Solids, total suspended | 2 | 0 | 0 | ||
| Sodium adsorption ratio | 2 | 0 | 0 | ||
| Aluminum, dissolved [as Al] | 2 | 0 | 0 | ||
| Temperature, water deg. fahrenheit | 1 | 0 | 0 | ||
| Specific conductance | 1 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 0 | 0 | ||
| Oil and grease, hexane extr method | 1 | 0 | 0 | ||
| Nitrogen, total [as N] | 1 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Phosphorus, total [as P] | 1 | 0 | 0 | ||
| Carbon, tot organic [TOC] | 1 | 0 | 0 | ||
| Cyanide, total [as CN] | 1 | 0 | 0 | ||
| Calcium, total recoverable | 1 | 0 | 0 | ||
| Magnesium, total recoverable | 1 | 0 | 0 | ||
| Sodium, total recoverable | 1 | 0 | 0 | ||
| Fluoride, total [as F] | 1 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 0 | 0 | ||
| Selenium, total recoverable | 1 | 0 | 0 | ||
| Boron, total recoverable | 1 | 0 | 0 | ||
| Barium, total recoverable | 1 | 0 | 0 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Strontium, total recoverable, ug/L | 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 | ||
| Antimony, total recoverable | 1 | 0 | 0 | ||
| Total phenols | 1 | 0 | 0 | ||
| Manganese, total recoverable | 1 | 0 | 0 | ||
| Petrol hydrocarbons, total recoverable | 1 | 0 | 0 | ||
| Solids, total dissolved | 1 | 0 | 0 | ||
| Mercury, total recoverable | 1 | 0 | 0 | ||
| Chemical Oxygen Demand [COD] | 1 | 0 | 0 | ||
| Oil and grease visual | 1 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 1, 2025 | Management Practice Violations - Failure to Maintain Records | ST6 |
| May 1, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| May 1, 2025 | Monitoring Violations - Invalid/Unrepresentative Sample | 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.
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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 MT0024210 there.
Nearby on the register
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.