Clean Water Act discharge permit · NPDES MTR10I03S

OPHEIM MAINLINE, Opheim, MT: NPDES MTR10I03S discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

OPHEIM MAINLINE, held by Macon Construction Co., holds NPDES permit MTR10I03S. EPA’s file records it issued March 22, 2022 and expiring February 16, 2027.

OPHEIM MAINLINE, Opheim, Montana: Coverage under a general permit MTR10I03S, held by Macon Construction Co.; Construction stormwater; Effective; issued March 22, 2022, term to February 16, 2027, by U.S. EPA.

Montana holds 2,848 Construction stormwater coverages of this permit type in EPA’s file; 1,596 were issued before MTR10I03S. Macon Construction Co. holds 4 permits in Montana.

Other permits held by Macon Construction Co.

FT PECK WEST BRANCHLINES PROJECT – PHASE 1, Wolf Point: MTR10I02M, issued December 29, 2019
FORT PECK WEST MAINLINE PROJECT – PHASES 2, 3 & 4, Nashua: MTR10I03T, issued March 22, 2022
FRAZER PUMP STATION ACCESS ROAD PROJECT, Frazer: MTR10I068, issued September 25, 2025

Coverages issued nearest MTR10I03S

March 18, 2022: STILLWATERS ON THE CLARK FORK #3, PHASES 1-12, Missoula, MTR109395, held by Greg Thomson - Stillwaters Phases 1-12
March 18, 2022: MULLAN CROSSING BUILDING PAD 2, Missoula, MTR109407, held by DICK ANDERSON CONSTRUCTION INC
March 22, 2022: COMMUNITY FIRST GRIFFIN PLACE, Bozeman, MTR109405, held by HRDC OF DISTRICT IX (MARTIN JOHNSON)
March 22, 2022: BOZEMAN HILL DITCH CLEANING, Bozeman, MTR109413, held by Montana Department of Transportation
March 22, 2022: LAUREL AUTO SUBSTATION EXPANSION, Laurel, MTR109418, held by NORTHWESTERN ENERGY
March 22, 2022: FORT PECK WEST MAINLINE PROJECT – PHASES 2, 3 & 4, Nashua, MTR10I03T, held by Macon Construction Co.
March 24, 2022: MT- 81 BRIDGES- JUDITH RIVER, Denton, MTR109417, held by MISSOURI RIVER CONTRACTORS
March 24, 2022: HOME2 SUITES BY HILTON, Bozeman, MTR109428, held by MARTEL CONSTRUCTION INC
March 25, 2022: BRONKEN DISTRIBUTION WAREHOUSE, Bozeman, MTR109355, held by R R Taylor Construction
March 25, 2022: MINKLER LOOP, PARKING LOT AND TRAILHEAD, Missoula, MTR109419, held by JAG GRADING AND PAVING LLC

OPHEIM MAINLINE among its neighbors

EPA’s permit file holds 1 discharge permits in the Lower Middle Fork Porcupine Creek subwatershed (HUC 100500160203), MTR10I03S among them.

What the register holds for OPHEIM MAINLINE: its NPDES ID, its permit type and status, its dates, its address in Opheim, Montana. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR10I03S.

Identity

Facility as filed	OPHEIM MAINLINE
Permittee as filed	Macon Construction Co.
NPDES ID	MTR10I03S
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	March 22, 2022
Expiration date	February 16, 2027
Issuing agency	U.S. EPA
Address	Opheim, MT 59250
Subwatershed	Lower Middle Fork Porcupine Creek (HUC 100500160203)

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 MTR10I03S.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MTR10I03S.

Inspections

EPA’s inspection file holds no inspection for NPDES MTR10I03S.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES MTR10I03S.

Watch this permit

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Nearby on the register

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

The OPHEIM MAINLINE storm water construction permit, held by Macon Construction Co. in Opheim, Montana, is the only storm water construction permit on EPA's NPDES register for that city, this one included. It is also the only NPDES permit in the Lower Middle Fork Porcupine Creek subwatershed (HUC 100500160203) on the register, this one included. The permit lists zero pollutants under a numeric limit and zero pollutants with an effluent exceedance.