Clean Water Act discharge permit · NPDES MTR107521

MISSOULA INTERNAT'L AIRPORT-TERMINAL ROAD IMPROVEMENTS, Missoula, MT: NPDES MTR107521 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

MISSOULA INTERNAT'L AIRPORT-TERMINAL ROAD IMPROVEMENTS, held by Martel Construction Inc, holds NPDES permit MTR107521, which discharges to Butler Creek. EPA’s file records it issued August 28, 2018 and expiring December 31, 2022. 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 filed	MISSOULA INTERNAT'L AIRPORT-TERMINAL ROAD IMPROVEMENTS
Permittee as filed	Martel Construction Inc
NPDES ID	MTR107521
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Construction stormwater
Issued	August 28, 2018
Expiration date	December 31, 2022
Address	Missoula, MT 59808
Receiving water	BUTLER CREEK
Subwatershed	Butler Creek (HUC 170102040201)

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

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES MTR107521.

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
October 11, 2018	WW Storm Water Construction - Failure to properly install/implement BMPs	ST6
October 11, 2018	WW Storm Water Construction - Failure to Maintain Records	ST6
October 11, 2018	WW Storm Water Construction - Failure to Conduct Inspections	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 MTR107521 there.

Nearby on the register

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

This public-records page covers NPDES permit MTR107521 for the Missoula International Airport terminal road improvements project in Missoula, MT, held by Martel Construction Inc and discharging to Butler Creek. The page lists a permit status of Effective, a minor discharger class, and a construction stormwater program, with an issue date of August 28, 2018 and an expiration date of December 31, 2022. It reports 0 pollutants on file, 0 under a numeric limit, and 0 with an effluent exceedance.