Clean Water Act discharge permit · NPDES MTR111210

SUGARLOAF LOOP OFFICE AND SHOP, Butte, MT: NPDES MTR111210 discharge permit, effluent exceedances, inspections, penalties

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

SUGARLOAF LOOP OFFICE AND SHOP, held by Mountain West Holding Company, holds NPDES permit MTR111210, which discharges to Silver Bow Creek. EPA’s file records it issued April 3, 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 SUGARLOAF LOOP OFFICE AND SHOP: its NPDES ID, its permit type and status, its dates, its address in Butte, Montana, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR111210.

Identity

Facility as filed	SUGARLOAF LOOP OFFICE AND SHOP
Permittee as filed	Mountain West Holding Company
NPDES ID	MTR111210
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	April 3, 2025
Expiration date	December 31, 2027
Address	Butte, MT 59701
Receiving water	SILVER BOW CREEK
Subwatershed	Silver Bow Creek-McCleery Gulch (HUC 170102010205)

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 MTR111210.

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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MTR111210.

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, MTR111210.

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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 MTR111210 there.

Nearby on the register

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

The SUGARLOAF LOOP OFFICE AND SHOP storm water construction permit, held by Mountain West Holding Company in Butte, is one of 57 such permits on EPA's NPDES register in Silver Bow County, including this one. Among the 55 storm water construction permits in the county, 78.2% were issued earlier than this permit, which was issued April 3, 2025. The permit sits within the Silver Bow Creek-McCleery Gulch subwatershed, where 15 NPDES permits are listed, this one included, and it has no pollutants under a numeric limit and no effluent exceedances on file.