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Clean Water Act discharge permit · NPDES MT0000884

BIG SKY MINE, Colstrip, MT: NPDES MT0000884 discharge permit, effluent exceedances, inspections, penalties

BIG SKY MINE, held by BIG SKY COAL COMPANY, holds NPDES permit MT0000884, which discharges to Rosebud Creek Drainages. EPA’s file records it issued May 31, 2016 and expiring June 30, 2021. 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 filedBIG SKY MINE
Permittee as filedBIG SKY COAL COMPANY
NPDES IDMT0000884
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedMay 31, 2016
Expiration dateJune 30, 2021
AddressColstrip, MT 59323
Receiving waterROSEBUD CREEK DRAINAGES
SubwatershedMiller Coulee (HUC 101000030508)
Other EPA IDs (FRS)RCRA handler MTD063728984

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Solids, settleable020

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MT0000884.

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES MT0000884.

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 MT0000884 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers the Clean Water Act discharge permit NPDES MT0000884 for the BIG SKY MINE in Colstrip, MT, held by BIG SKY COAL COMPANY, which discharges to Rosebud Creek Drainages in the Miller Coulee subwatershed (HUC 101000030508). The permit is administratively continued, with a permit status of Minor Discharger class, and the file lists 1 pollutant on file, 0 pollutants under a numeric limit, and 0 pollutants with an effluent exceedance.