Skip to content
AirPermitHub

ID · EPA Region 10

Idaho Air Permits

Idaho DEQ requires a Permit to Construct (PTC) before constructing or modifying sources that emit or may emit air pollutants, unless exempt. Rock crushers and certain dairies may use a Permit by Rule registration instead. General permits cover concrete batch plants, hot mix asphalt plants, and automotive coating. Tier I operating permits are Idaho's Title V permits (DEQ is the EPA-delegated agency); Tier II operating permits set facility caps, synthetic minor limits, or other limits. Rules are in IDAPA 58.01.01.
Partially verifiedLast reviewed 2026-10-25
Partially verified. Specific IDAPA 58.01.01 section numbers and numeric thresholds were not stated on DEQ's permitting page and are omitted. The Tier I page could not be loaded during review. Air permitting hotline: 1-877-573-7648.

Air permits & authorizations

  • Exemptions

    Exemption

    Self-exemption and exemption forms exist (general Exemptions Form, 6H Notification and Petition, automotive coating and cabinet making self-exemptions). One-time occurrences, such as painting a vehicle in a shop, do not require a permit.

    IDAPA 58.01.01Official page

  • Permit by Rule (PBR)

    Permit by Rule

    Registration in place of a PTC; available only to rock crushers and certain dairies.

    IDAPA 58.01.01Official page

  • General Permits

    General Permit

    Concrete batch plants, hot-mix asphalt plants, and automotive coating operations. One-time fee of $1,500 ($1,000 application plus $500 processing) per DEQ.

    Thresholds (summarized from source, not a quotation)

    Per DEQ: automotive coating general permit applies to facilities using 4 gallons or less of coating materials per calendar day.

    IDAPA 58.01.01Official page

  • Permit to Construct (PTC)

    Minor NSR

    Required before constructing or modifying sources that emit or may emit air pollutants; typically requires an air quality modeling demonstration.

    IDAPA 58.01.01Official page

  • Tier II Operating Permit

    State Operating

    Authorizes facility emission caps, mercury BACT limits, or synthetic minor limits; may be required for Regional Haze BART.

    IDAPA 58.01.01Official page

Major NSR (PSD & nonattainment)

  • PSD

    PSD

    Major source preconstruction review is part of Idaho's PTC rules in IDAPA 58.01.01. DEQ's permitting page does not describe PSD separately.

    IDAPA 58.01.01Official page

Title V operating permits

  • Tier I Operating Permit (Title V)

    Title V

    Consolidates applicable federal, state, and local requirements for major stationary sources into one federally enforceable permit.

    IDAPA 58.01.01Official page

Oil & Gas

DEQ's air permitting pages list no oil-and-gas-specific air permit. Oil and gas facilities follow the PTC/Tier I/Tier II framework; federal NSPS OOOO-series and NESHAP HH apply where applicable.

    Oil & Gas industry hub

    State air regulations

    Forms

    Guidance

    Compliance

    State compliance obligations (reporting, emissions inventory, testing) are being indexed. Use the Compliance dashboard preview to see how they will be tracked.

    Sources

    AirPermitHub provides educational, engineering, research, and compliance-support information. Information provided by the platform does not constitute legal advice and should not replace review of applicable regulations, permits, agency guidance, or consultation with qualified professionals. Full disclaimer