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Clean Water Act discharge permit · NPDES MTR111506

PHASE 4A, Missoula, MT: NPDES MTR111506 discharge permit, effluent exceedances, inspections, penalties

PHASE 4A, held by Butler creek development, holds NPDES permit MTR111506, which discharges to Butler Creek. EPA’s file records it issued September 8, 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 PHASE 4A: its NPDES ID, its permit type and status, its dates, its address in Missoula, Montana, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR111506.

Identity

Facility as filedPHASE 4A
Permittee as filedButler creek development
NPDES IDMTR111506
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramConstruction stormwater
IssuedSeptember 8, 2025
Expiration dateDecember 31, 2027
AddressMissoula, MT 59801
Receiving waterBUTLER CREEK
SubwatershedButler Creek (HUC 170102040201)

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 MTR111506.

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 MTR111506.

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, MTR111506.

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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 MTR111506 there.

Nearby on the register

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

What this page shows

The PHASE 4A permit, filed under Butler creek development, is one of 206 storm water construction permits in Missoula County, and 13.1% of that group has a violation on file. Of the 194 storm water construction permits in Missoula County, 78.9% carry an earlier issue date than this one. PHASE 4A has no pollutants under a numeric limit and no pollutants with an effluent exceedance, and it sits among 16 NPDES permits in the Butler Creek subwatershed.