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Facility profile

Montana Sulphur & Chemical Co

Violation Identified across 9 of the last 12 quarters in the imported ECHO record.

Violation Identified Chemicals TRI + Clean Air Act + Clean Water Act + RCRA 110000428476 Yellowstone County
Noncompliance quarters
9

Counted from the imported ECHO record over the last 12 quarters.

Penalties
$0

Recorded enforcement amount carried into the facility page.

Last inspection
2025-09-23

Displayed as plain language instead of hidden in agency exports.

Trend
Watch

Reported on-site releases are higher in 2024 than in 2022.

Year Air Water Land Total
2022 14,350 lbs 0 lbs 0 lbs 14,350 lbs
2023 17,559 lbs 0 lbs 0 lbs 17,559 lbs
2024 17,741 lbs 0 lbs 0 lbs 17,741 lbs
Chemical breakdown

What this facility is reporting

  • air 15,548 lbs

    Hydrogen sulfide

    Latest 2024 TRI data shows air as the largest reported pathway for this chemical at the facility.

  • air 1,167 lbs

    Carbon disulfide

    Latest 2024 TRI data shows air as the largest reported pathway for this chemical at the facility.

  • air 1,026 lbs

    Carbonyl sulfide

    Latest 2024 TRI data shows air as the largest reported pathway for this chemical at the facility.

Enforcement layer

Why the ECHO-style detail matters

Violation Identified across 9 of the last 12 quarters in the imported ECHO record.

Violation Identified Last recorded inspection: 2025-09-23.