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Clean Water Act discharge permit · NPDES MTR109418

LAUREL AUTO SUBSTATION EXPANSION, Laurel, MT: NPDES MTR109418 discharge permit, effluent exceedances, inspections, penalties

LAUREL AUTO SUBSTATION EXPANSION, held by NORTHWESTERN ENERGY, holds NPDES permit MTR109418, which discharges to Clarks Fork Ditch. EPA’s file records it issued March 22, 2022 and expiring December 31, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for LAUREL AUTO SUBSTATION EXPANSION: its NPDES ID, its permit type and status, its dates, its address in Laurel, Montana, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR109418.

Identity

Facility as filedLAUREL AUTO SUBSTATION EXPANSION
Permittee as filedNORTHWESTERN ENERGY
NPDES IDMTR109418
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramConstruction stormwater
IssuedMarch 22, 2022
Expiration dateDecember 31, 2022
AddressLaurel, MT 59044
Receiving waterCLARKS FORK DITCH
SubwatershedYellowstone River-Indian Creek (HUC 100700040602)
SIC1731 – Electrical Work

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES MTR109418.

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 MTR109418.

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, MTR109418.

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How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

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 MTR109418 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

The LAUREL AUTO SUBSTATION EXPANSION storm water construction permit is one of 262 such permits on EPA's NPDES register in Yellowstone County, and it sits among 31 NPDES permits in the Yellowstone River-Indian Creek subwatershed. The permit has no pollutants under a numeric limit and no pollutants with an effluent exceedance on file, while 5.0% of the county's storm water construction permits carry a violation.