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Facility profile

Chs Inc Laurel Refinery

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

Violation Identified Petroleum TRI + Clean Air Act + Clean Water Act + RCRA 110000595124 Yellowstone County
Noncompliance quarters
12

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

Penalties
$0

Recorded enforcement amount carried into the facility page.

Last inspection
2026-03-16

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 123,895 lbs 9,980 lbs 0 lbs 133,875 lbs
2023 122,221 lbs 46,755 lbs 0 lbs 168,976 lbs
2024 144,472 lbs 116,278 lbs 0 lbs 260,750 lbs
Chemical breakdown

What this facility is reporting

  • water 113,394 lbs

    Nitrate compounds (water dissociable; reportable only when in aqueous solution)

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

  • air 62,194 lbs

    Ammonia

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

  • air 28,064 lbs

    Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)

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

  • air 10,852 lbs

    Propylene

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

  • air 8,308 lbs

    n-Hexane

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

  • air 6,486 lbs

    Methanol

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

  • air 6,277 lbs

    Xylene (mixed isomers)

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

  • air 4,949 lbs

    Hydrogen sulfide

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

  • air 4,935 lbs

    Toluene

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

  • air 3,452 lbs

    1, 2, 4-Trimethylbenzene

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

  • air 3,410 lbs

    Benzene

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

  • air 1,754 lbs

    Naphthalene

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

  • air 1,486 lbs

    Ethylbenzene

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

  • air 1,428 lbs

    Cyclohexane

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

  • air 1,231 lbs

    Phenol

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

  • air 1,127 lbs

    Phenanthrene

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

  • air 844 lbs

    Tetrachloroethylene

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

  • air 299 lbs

    Zinc compounds

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

  • air 201 lbs

    Hydrogen fluoride

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

  • air 38 lbs

    Polycyclic aromatic compounds

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

  • air 18 lbs

    Molybdenum trioxide

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

  • air 3 lbs

    Cumene

    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 12 of the last 12 quarters in the imported ECHO record.

Violation Identified Last recorded inspection: 2026-03-16.