Clean Water Act discharge permit · NPDES WY0024091
BLACK THUNDER MINE, Wright, WY: NPDES WY0024091 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
BLACK THUNDER MINE, held by Thunder Basin Coal Company, LLC, holds NPDES permit WY0024091. EPA’s file records it issued March 31, 2020 and expiring June 30, 2025. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | BLACK THUNDER MINE |
|---|---|
| Permittee as filed | Thunder Basin Coal Company, LLC |
| NPDES ID | WY0024091 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | March 31, 2020 |
| Expiration date | June 30, 2025 |
| Issuing agency | WDEQ |
| Address | Wright, WY 82732 |
| Subwatershed | Cottonwood Creek-Black Thunder Creek (HUC 101201030201) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 6Pollutants on file
- 6Under a numeric limit
- 1With a violation of any kind
- 1With 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 |
|---|---|---|---|---|---|
| pH | 60 | 1 | 1 | March 31, 2021 | |
| Solids, total suspended | 90 | 0 | 0 | ||
| Iron, total [as Fe] | 90 | 0 | 0 | ||
| Flow | 90 | 0 | 0 | ||
| Solids, settleable | 30 | 0 | 0 | ||
| Duration | 30 | 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 WY0024091.
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 WY0024091 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.