DEQ Reviews Air Permit for Calumet DAF System | Montana Department of Environmental Quality | CALUMET MONTANA REFINING LLC

DEQ Reviews Air Permit for Calumet DAF System

The Montana Department of Environmental Quality completed an Environmental Assessment for Calumet Montana Refining LLC’s application for Air Quality Permit #2161-41 to add a new dissolved air flotation system at its Great Falls refinery. The permit action would authorize operation of the system and administrative changes related to a prior consent decree, with DEQ finding no significant environmental impacts.

Document date · September 2, 2026

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Scope & details

The full contract record, as filed.

Contract type

OTHER

Renewal

Initial issuance of MAQP #2161-41; any future modifications or amendments would require separate DEQ review under the Clean Air Act of Montana and MEPA.

Document type

Report

Source document

Montana Department of Environmental Quality Environmental Assessment New Dissolved Air Flotation System-Calumet Montana Refining 2026-09-02

Frequently asked questions

Common questions about this contract, answered from the record.

Who was awarded the government contract by Montana Department of Environmental Quality?

Calumet Montana Refining Llc was awarded this government contract by Montana Department of Environmental Quality, as recorded on September 2, 2026.

What type of contract is this?

This is a government contract, documented as a report record.

Where was this contract approved?

This contract appears in Montana Department of Environmental Quality Environmental Assessment New Dissolved Air Flotation System-Calumet Montana Refining 2026-09-02 (Report), dated September 2, 2026 from Montana Department of Environmental Quality. Civic IQ extracts contract records directly from agency meeting documents and solicitations.

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