TCEQ air permit types, explained.
Texas air authorizations run from a registration you can claim in a day to a year-long federal review. This chapter lays out every type — what it authorizes, who it's for, and how it differs from the one next to it.
New Source Review
The construction authorizations, from de minimis up through major-source PSD. This is what you need before you break ground.
Title V Operating Permits
The federal permit a major site holds to keep running — issued as an SOP, GOP, or TOP. Separate from building.
Every authorization, one table.
Roughly ordered from lowest emissions to highest. Scan for the closest fit, then read the detail below.
| Authorization | Program | Best fit |
|---|---|---|
| De Minimis | NSR | Sources that emit so little they need no authorization at all. |
| Permit by Rule (PBR) | NSR | Small or routine sources under set emission thresholds. |
| Standard Permit | NSR | Well-understood facility classes — batch plants, crushers, boilers. |
| New Source Review | NSR | Anything that doesn't fit a PBR or standard permit; case-by-case. |
| Flexible Permit | NSR | Sites that want to manage total emissions under one cap. |
| PSD / Nonattainment | NSR | Major sources and major modifications; adds federal review. |
| Title V (FOP) | Operating | Major sites — the permit to operate, not to build. |
The two-program split matters: a large facility often holds an NSR construction authorization and a Title V operating permit at the same time. Where the line between them falls is the subject of the next chapter, NSR vs. Title V.
The construction authorizations.
These authorize you to build or modify a source. They climb from no permit at all up to full major-source federal review.
De Minimis
The floor of the system. Sources that emit little enough to meet the criteria in 30 TAC §116.119(a) need no registration or authorization before construction. All site emissions must qualify — there's no partial permitting — and records still have to be kept.
Permit by Rule
A standardized authorization for sources that stay under set thresholds. There are 108 individual PBRs in 30 TAC Chapter 106; a source has to meet every condition of the one it claims. Many PBRs don't require best available control technology, and some require registration while others don't.
Standard Permit
A pre-set permit for well-characterized classes of facility — concrete batch plants, rock and concrete crushers, hot-mix asphalt plants, boilers, cotton gins, and more. It's an efficient alternative to a custom review, but nearly all standard permits require BACT, and some require public notice. Standard permit registrations are renewed every ten years.
New Source Review (case-by-case)
The core construction permit for sources that don't fit a PBR or standard permit. TCEQ runs an administrative review and a technical review — source identification, emission quantification, off-property health-impacts analysis, and a best-available-control-technology determination — with public notice where required.
Flexible Permit
A variant of NSR that sets an overall emissions cap for a site and lets the operator structure operations to stay under it. It follows the same permitting requirements as a standard NSR permit — the flexibility is in how the site manages the cap, not in the review.
Prevention of Significant Deterioration
Federal review that applies when a new facility is a major stationary source — or a change is a major modification — in an area that meets federal air standards. It layers dispersion modeling and additional analysis on top of the NSR requirements. Greenhouse-gas emissions above the thresholds trigger a separate GHG PSD permit.
Nonattainment
Applies to major sources in areas the EPA has designated as not meeting a federal air standard. It's the most demanding tier: it requires the lowest achievable emission rate — generally stricter than BACT — and the purchase of emission offsets so that new emissions are more than compensated by reductions elsewhere in the area.
The operating permit.
Once a major site is built, this federal operating permit governs how it runs — consolidating every applicable requirement and setting the monitoring, recordkeeping, and annual compliance certification.
Federal Operating Permit (Title V)
Required for major sites under 30 TAC Chapter 122. Rather than authorize construction, it pulls a site's existing requirements into one document and defines how the operator proves compliance — including certifying compliance annually and reporting deviations. It comes in three forms, below. Title V permits are renewed at least every five years.
| Title V form | What it is |
|---|---|
| SOP — Site Operating Permit | A case-by-case permit written for one specific site. Subject to public notice, EPA review, and a public-petition period. The default when a site doesn't qualify for a GOP or TOP. |
| GOP — General Operating Permit | Streamlined, uniform terms covering a class of similar sites (oil & gas, landfills, air-curtain incinerators). Operators get an authorization to operate under it. Sites on case-by-case NSR permits don't qualify. |
| TOP — Temporary Operating Permit | Covers a source that relocates — one that changes location at least once in any five-year period. A single permit can authorize the same temporary source at multiple locations. |
Every one of these types shows up as a code on a TCEQ record. You can look up any permit by type, company, or county to see live examples — from a concrete batch plant standard permit to a data-center PSD review.
Which type applies to you?
The type isn't something you pick from preference — it's set by what your facility is and how much it emits. A source lands on the lightest authorization it qualifies for: de minimis if it can, then permit by rule, then a standard permit, and only a case-by-case NSR review when nothing standardized fits. Major-source thresholds pull the largest projects up into PSD or nonattainment on top of that.
Two closing points that trip people up. First, construction and operating permits are separate— building a major site under NSR doesn't satisfy Title V, and vice versa. Second, the type drives the timeline: a PBR targets 45 days while a federal review targets 365, so the authorization you need shapes how you plan a project.
To walk the decision the other direction — starting from your project — see Do I need a permit? For how any of these move once filed, see The permitting process.
Permit types, answered.
What are the main types of TCEQ air permits?+−
They fall into two programs. On the construction side (NSR): de minimis, permit by rule, standard permit, case-by-case NSR, flexible permit, and the major-source federal reviews — PSD and nonattainment. On the operating side: the Title V federal operating permit, issued as an SOP, GOP, or TOP.
What's the difference between a permit by rule and a standard permit?+−
A PBR is the lightest-touch authorization — a standardized registration for low-emitting sources, with 108 of them in 30 TAC Chapter 106, and many don't require BACT. A standard permit is a pre-set authorization for well-characterized facility classes that usually emit more than a PBR allows; nearly all require BACT, and registrations renew every ten years.
What is a flexible permit?+−
A New Source Review permit that sets an overall emissions cap for a site and lets the operator decide how to stay under it. It follows the same review requirements as a standard NSR permit but gives more day-to-day operating flexibility.
What are SOP, GOP, and TOP under Title V?+−
The three forms of a Title V operating permit. An SOP (Site Operating Permit) is case-by-case and specific to one site. A GOP (General Operating Permit) offers streamlined, uniform terms for classes of similar sites via an authorization to operate. A TOP (Temporary Operating Permit) covers sources that relocate. Title V permits renew at least every five years.
What's the difference between PSD and nonattainment permits?+−
Both are major-source NSR. PSD applies to major sources in areas that meet federal air standards and adds dispersion modeling and BACT. Nonattainment applies where an area doesn't meet federal standards; it requires the lowest achievable emission rate and the purchase of emission offsets for new emissions.
Know the types. Track them live.
See every one of these authorizations in real TCEQ filings — and get an alert within a day when one you're watching changes status, comes up for renewal, or is newly filed.
This chapter summarizes publicly available TCEQ guidance for general informational purposes only — it is not legal, engineering, or professional advice. Type descriptions, rule citations, and time frames are drawn from TCEQ's Air Permitting Fact Sheet (RG-616) and Chapters 106, 116, and 122 of 30 TAC, and may change; always confirm against the current TCEQ rules before acting.