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Clean Water Act discharge permit · NPDES MTR111256

FLAT CREEK MERCANTILE, Wolf Creek, MT: NPDES MTR111256 discharge permit, effluent exceedances, inspections, penalties

FLAT CREEK MERCANTILE, held by Detailed Construction Company, holds NPDES permit MTR111256, which discharges to Black Rock Creek. EPA’s file records it issued April 25, 2025 and expiring December 31, 2027. 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.

What the register holds for FLAT CREEK MERCANTILE: its NPDES ID, its permit type and status, its dates, its address in Wolf Creek, Montana, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR111256.

Identity

Facility as filedFLAT CREEK MERCANTILE
Permittee as filedDetailed Construction Company
NPDES IDMTR111256
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramConstruction stormwater
IssuedApril 25, 2025
Expiration dateDecember 31, 2027
AddressWolf Creek, MT 59648
Receiving waterBLACK ROCK CREEK
SubwatershedMiddle Flat Creek (HUC 100301020303)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES MTR111256.

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 MTR111256.

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, MTR111256.

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How we handle your data → Privacy

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 MTR111256 there.

Nearby on the register

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

What this page shows

The Middle Flat Creek subwatershed has 1 NPDES permit, counting FLAT CREEK MERCANTILE. Among 145 storm water construction permits in Lewis and Clark County, 13.1% have a violation on file. Of the 133 Lewis and Clark County storm water permits counting this permit, 76.7% were issued before it.