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WY · EPA Region 8

Wyoming Air Permits

Wyoming DEQ's Air Quality Division requires a construction permit before construction or modification of a source begins (WAQSR Chapter 6, Section 2(a)(i)). DEQ says Chapter 6 has no de minimis emission levels; instead, Section 2(k) lists specific activities that do not need approval. Oil and gas production sites that use Best Available Control Technology (BACT) may begin construction without prior authorization under W.S. 35-11-801(e), and DEQ's Oil and Gas Production Facilities Permitting Guidance defines that BACT. Major sources need PSD (Chapter 6, Section 4), nonattainment NSR (Chapter 6, Section 13; Upper Green River Basin ozone area), and a Title V operating permit (Chapter 6, Section 3). Applications are submitted through the IMPACT portal, and drafts are posted on OpenAir. EPA Region 8 is the permitting authority in Indian Country.
Partially verifiedLast reviewed 2026-10-25
Partially verified. DEQ's Title V and Ozone pages need JavaScript and could not be read, so Title V thresholds are not stated. The Oil and Gas Guidance document itself was not retrieved; the 6 tpy figures come from DEQ's 2016 release, and a newer revision may exist. The Chapter 8, Section 6 title comes from the published Wyoming code and was not seen on a .gov page. PSD numeric thresholds are not restated. NSR Program: (307) 777-7045; IMPACT help: deq-air-impact@wyo.gov, 307-777-7391.

Air permits & authorizations

  • Chapter 6, Section 2(k) activities not requiring approval

    Exemption

    No approval is needed for these activities: air pollutant detectors, recorders, combustion controllers or shutoffs; air conditioning or ventilation not designed to remove pollutants; smaller fuel-burning equipment within specified heat input and fuel limits; mobile internal combustion engines; laboratory equipment used only for analyses; installing air pollution control equipment; gasoline storage tanks at retail establishments; and other minor sources the Administrator finds insignificant (a waiver under 2(k)(viii)). Major emitting facilities under Section 4 must still comply with Sections 2 and 4. DEQ states there are no de minimis emission levels.

    Quoted verbatim from the agency source
    The permitting rules contained in Chapter 6 of the WAQSR do not include de minimis emission levels
    WAQSR Ch. 6, Sec. 2(k)Official page

  • Construction / Modification Permit (NSR)

    Minor NSR

    A construction or modification permit is required before work begins on a new or modified source. After DEQ proposes a decision, it advertises it for a 30-day public comment period, and drafts are posted on OpenAir. Fees are a minimum $1,000 initial fee per application plus a minimum of $105 per hour, invoiced after filing. Applications go through IMPACT or are mailed (two paper copies) to the NSR Permitting Program in Cheyenne.

    WAQSR Ch. 6, Sec. 2(a)(i)Official page

  • Minor Source Operating Permit

    State Operating

    Under Section 2(a)(iii), the applicant submits an as-built application. Section 2(e) requires the applicant to show compliance and that construction matched the permit before DEQ grants an operating permit.

    WAQSR Ch. 6, Sec. 2(a)(iii), 2(e)Official page

Major NSR (PSD & nonattainment)

  • Prevention of Significant Deterioration (PSD)

    PSD

    PSD applies to major emitting facilities and major modifications. The pages reviewed do not restate numeric thresholds; see Chapter 6, Section 4.

    WAQSR Ch. 6, Sec. 4Official page

  • Nonattainment New Source Review

    Nonattainment NSR

    Applies to new major sources and major modifications of NOx and VOC (ozone precursors) in the Upper Green River Basin ozone nonattainment area, with LAER instead of BACT. The minor NSR exemptions in Section 2(k) do not apply to NNSR. Section 13 does not apply in the Sheridan PM10 area, where a Section 2(c)(ii)(B) construction ban continues. EPA approved Section 13 effective July 5, 2016.

    WAQSR Ch. 6, Sec. 13Official page

Title V operating permits

  • Title V Operating Permit

    Title V

    Wyoming DEQ AQD issues Title V permits outside Indian Country (per EPA). DEQ's Title V page would not load during review, so thresholds and timelines are not restated here.

    WAQSR Ch. 6, Sec. 3Official page

Oil & Gas

Wyoming law (W.S. 35-11-801(e)) lets oil and gas production sites that meet BACT begin construction without prior authorization. Since 1997, DEQ's Oil and Gas Production Facilities Permitting Guidance has defined BACT for these sites; the May 2016 (8th) update merged the former Statewide and Concentrated Development Areas into one area (control levels are in the guidance entry). The Upper Green River Basin (UGRB) was designated an ozone nonattainment area in 2012 under the 2008 standard; EPA found it attained in 2016, and DEQ began redesignation in December 2024. In 2024 DEQ adopted an emergency rule to incorporate EPA's NSPS OOOOb methane rule.

  • Oil and Gas Production Facilities Permitting Guidance (BACT)

    Other

    Defines presumptive BACT and permitting procedures for oil and gas production facilities, including tanks, dehydration units, truck loading and pumping unit engines. Applications are submitted through IMPACT.

    Quoted verbatim from the agency source
    6 tons per year or more

    Thresholds (summarized from source, not a quotation)

    Controls for single-well tanks and dehydration units at VOC/HAP emissions of 6 tpy or more; truck loading controls statewide at 6 tpy or more (restated from DEQ 2016 release).

    W.S. 35-11-801(e); WAQSR Ch. 6, Sec. 2Official page

  • UGRB ozone requirements and redesignation

    Other

    DEQ adopted enforceable reductions for the Upper Green River Basin and is preparing a redesignation request with a 20-year maintenance plan.

    Official page

  • NSPS OOOOb emergency rule (2024)

    Other

    Emergency rule incorporating 40 CFR Part 60 subpart OOOOb (effective federally May 7, 2024) so DEQ keeps primacy, with a regular rulemaking to follow.

    Official page
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