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Violation page

Clean Air Act violations in Montana

Montana facilities in the imported ECHO data show air-program oversight, inspections, or noncompliance signals.

Montana 2,374 statewide signals
Recent actions

What the page calls out

  • Latest action not expanded yet.

  • Last recorded inspection: 2025-08-18. Total penalties on record: $409,709.

  • Last recorded inspection: 2025-09-02. Total penalties on record: $38,000.

Facilities

Profiles tied to this violation theme

  • Significant Violation Cascade County

    Calumet Montana Refining (cmr), Llc

    Significant Violation across 12 of the last 12 quarters, with $409,709 in recorded penalties.

  • Significant Violation Yellowstone County

    Western Sugar Cooperative

    Significant Violation across 12 of the last 12 quarters, with $38,000 in recorded penalties.

  • Violation Identified Yellowstone County

    Chs Inc Laurel Refinery

    Violation Identified across 12 of the last 12 quarters in the imported ECHO record.

  • Violation Identified Stillwater County

    Smc Nye Mine Site

    Violation Identified across 11 of the last 12 quarters in the imported ECHO record.

  • Significant Violation Yellowstone County

    Schnitzer Steel Billings

    Significant Violation across 1 of the last 12 quarters, with $1,550,000 in recorded penalties.

  • No Violation Identified Rosebud County

    Ppl Colstrip Steam Electric Station

    No Violation Identified across 1 of the last 12 quarters in the imported ECHO record.