Title V permit questions usually start with a phone call from a consultant or a letter from the state. Someone has run a potential-to-emit calculation for your facility. The number came out higher than expected. Now you need to know whether the permit applies to you. You also need to know what it commits you to and how much work it adds. Those are fair questions. The answers are more manageable than the reputation suggests.
Before anything else, it helps to understand what the permit does not do. It doesn’t create new emission limits. Instead, it collects every requirement that already applies to your facility into a single enforceable document. Because of that, the permit is mostly a documentation regime. The facilities that struggle with it are the ones whose records don’t match their permit terms.
In this guide, we cover who needs the permit, what it contains, and how the April 2026 EPA guidance changed renewals. We also explain the part most agency pages skip: how your control equipment becomes a permit condition. Our engineers design regenerative thermal oxidizer systems that end up written into these permits, so we’ve seen where facilities get caught and where they don’t.
What Is a Title V Permit?
A Title V permit is an operating permit required under Title V of the Clean Air Act Amendments of 1990. A Title V permit is a federally enforceable operating permit that compiles every air quality requirement applying to a facility into one document with a five-year term. Congress modeled the program on the water permitting system that already existed. The goal was enforcement clarity. Before 1990, a facility had to track its air requirements across construction permits, state rules, and federal standards. Nobody held the whole picture in one place.
State and local agencies issue most permits under what the EPA calls part 70 programs. The EPA itself issues a small number under part 71, typically in areas without an approved state program. The EPA’s overview of operating permits explains the split. Either way, the permit content is the same. The permit lists emission limits, monitoring methods, recordkeeping rules, and reporting schedules, and it makes all of them enforceable by both the state and the EPA. It also opens the permit to public comment and to citizen enforcement. That is part of why agencies treat deviations seriously.
Title V vs. a Construction Permit
Facilities often confuse the operating permit with the construction permit they received when they built a line. The two are different, and most major sources hold both. A construction permit, issued under New Source Review, authorizes you to build or modify a source. It usually sets the emission limits and the control device requirements for that source. It is a one-time authorization tied to a specific project.
The operating permit then absorbs those conditions. A Title V operating permit incorporates the emission limits and control device conditions from a facility’s construction permits rather than replacing them. Consequently, the destruction efficiency and combustion temperature written into an oxidizer’s construction permit follow it into the Title V permit. They stay there for the life of the equipment. When we scope a new system, we ask for both permits up front. The construction permit tells us the numbers. The operating permit tells us how the agency will expect the facility to prove them.
Who Needs a Title V Permit?
The permit applies to major sources, and the definition of “major” depends on the pollutant. A facility is a major source under Title V if it has the potential to emit 100 tons per year of any regulated air pollutant, with lower thresholds in ozone nonattainment areas. For hazardous air pollutants, the thresholds are lower still. Our hazardous air pollutants list guide covers which compounds count. A facility with the potential to emit 10 tons per year of any single hazardous air pollutant, or 25 tons per year of any combination, is a major source regardless of its other emissions.
Potential to Emit vs. Actual Emissions
The word “potential” carries most of the weight in that definition. Actual emissions from last year don’t determine applicability. Potential to emit is the maximum a facility could emit running at full capacity, year-round, unless a federally enforceable limit restricts it. A coating line that ran one shift last year but could run three counts at three. Similarly, a control device only reduces potential to emit if the permit requires it to run. An oxidizer that a facility operates voluntarily doesn’t count toward the calculation at all. The EPA’s who has to obtain a Title V permit page lists the full set of triggers.
Some non-major sources need the permit as well. Any source subject to a National Emission Standards for Hazardous Air Pollutants (NESHAP) rule can fall into the program. The same applies to New Source Performance Standards rules. Only an exemption in the specific rule keeps it out. Because of that, a small facility in a regulated source category can find itself in the program. One process line is enough. When a client isn’t sure which side of the threshold they’re on, we help them calculate controlled potential to emit. We use the documented destruction efficiency of their oxidizer. Often, that number is the difference between needing the permit and avoiding it.
Synthetic Minor Sources and Avoiding Title V
Many facilities stay out of the program on purpose. A synthetic minor source is a facility whose uncontrolled potential to emit exceeds a major-source threshold. It has accepted federally enforceable limits to stay below that threshold. Those limits can be production caps, material restrictions, or a control device with a required efficiency.
The oxidizer is often the limit. A facility can avoid Title V by accepting a federally enforceable requirement to operate its thermal oxidizer at a specified destruction efficiency whenever the process runs. That requirement then appears in a minor source air permit instead of a Title V permit. The trade-off is real, though. The facility gives up the option to run the process with the oxidizer offline. It also takes on monitoring obligations to prove it meets the limit. For a plant with a reliable system, that trade-off is usually worth making. Our regenerative thermal oxidizers run at 99%+ uptime. Because of that, we’ve seen many clients choose the synthetic minor route without regretting it.
What a Title V Permit Contains
A typical permit runs from a few dozen pages to several hundred. Most of it follows a standard structure. The sections that matter most day to day are the ones tied to each emission unit. Every emission unit in a Title V permit carries its own applicable requirements, emission limits, monitoring methods, recordkeeping obligations, and reporting schedule. For a facility with an oxidizer, the permit usually treats the oxidizer as a control device attached to one or more process units. It is rarely listed as a separate unit.
Two facility-wide obligations sit on top of the unit-level requirements. First, the facility must submit monitoring reports at least every six months. It must also report any deviation from a permit term promptly. Second, a designated responsible official must sign an annual compliance certification. The annual compliance certification requires a responsible official to certify, under penalty of law, that the facility complied with every term of its Title V permit during the year. That signature is why plant managers care about oxidizer records even when the equipment runs well.
The monitoring terms are where industrial air emission control equipment shows up most concretely. For a thermal oxidizer, the permit will usually require three things. It will call for continuous temperature monitoring at the combustion chamber, a minimum temperature setpoint, and a periodic performance test. The permit may also require capture efficiency verification for the enclosure feeding the oxidizer. Before a performance test, our compliance testing and permitting consulting team reviews the permit’s monitoring terms with the client. That way the test plan measures what the permit actually asks for.
How Your Oxidizer Becomes a Permit Condition
Here is the part that catches facilities off guard. The oxidizer doesn’t enter the permit as a piece of equipment. It enters as a set of operating conditions established during a performance test. After a performance test, the combustion chamber temperature, pressure drop, and other parameters recorded during the test become the enforceable operating conditions for the oxidizer under the Title V permit. If the test ran at 1,550 degrees F, the permit will typically require the facility to hold at least that temperature. The requirement applies whenever the process operates.
Any time the oxidizer drops below that setpoint while the process runs, the facility has a deviation. A permit deviation is any period during which a facility fails to meet a term of its Title V permit, and it must be documented and reported even when no emission limit was actually exceeded. That distinction matters. A temperature dip during a burner fault is a deviation whether or not any excess VOCs left the stack. As a result, temperature control stability and data logging are compliance features of an oxidizer. They aren’t conveniences. We design our regenerative thermal oxidizer systems with those recordkeeping obligations in mind. Our engineers review a facility’s permit terms before finalizing control logic.
Equipment Changes and Permit Modifications
Equipment changes are the other trap. Modifying a permitted control device, including changing its media, burner, or control system, may require a permit revision before the change is made. Some changes qualify as administrative amendments. Others need a minor modification, which involves agency review. A few trigger the construction permit process all over again. The category depends on whether the change affects a monitored parameter or an emission limit. Before we quote a rebuild or an upgrade, we look at the permit to see which category the work falls into. That is why our thermal oxidizer upgrades proposals include a permit impact note whenever the work could touch a permit term. The facility can then talk to its agency before work starts rather than after.
Renewals and the 2026 EPA Guidance
The permit expires after five years, and renewal historically meant rebuilding the entire application. In April 2026, the EPA issued guidance on Title V renewals that changed the workload. Under the guidance, a facility whose permit terms haven’t changed can resubmit its prior application with an updated date. It can also cross-reference earlier material instead of rewriting it. The agency’s statement of basis can focus on new requirements instead of restating the reasoning for every term.
For a facility with control equipment, that guidance rewards stability. A plant that has run the same oxidizer under the same terms for five years now has a much shorter renewal path. Clean monitoring records are what make that path available. A plant that made undocumented equipment changes does not. In addition, the guidance doesn’t limit an agency’s ability to ask for more information if something looks off. Complete records still matter. When clients approach a renewal, we pull the oxidizer’s operating history against the permit terms. Then we flag anything the agency is likely to ask about.
Final Thoughts
Title V is a records program more than an emissions program. The permit rarely asks a facility to emit less than it already does. It asks the facility to prove, continuously and in writing, that it is doing what it said it would do. Control equipment that produces clean, consistent operating data makes that proof easy. Equipment that doesn’t turns every renewal and every inspection into an argument.
If your facility is approaching a threshold, that’s a conversation worth having before the application is due. The same goes if a renewal is coming and the oxidizer’s records aren’t as tidy as the permit expects. We can review your oxidizer’s operating history against the permit’s monitoring terms. Then we can tell you where the gaps are. From there, you can decide whether the fix is a records process, a controls upgrade, or nothing at all.
TANN Corporation has designed and manufactured regenerative thermal oxidizer systems for 40+ years, serving manufacturers across every industry with VOC compliance requirements. Our engineering team evaluates each application individually, recommending system configurations optimized for specific exhaust characteristics and compliance obligations. From initial assessment through installation and decades of ongoing support, we deliver complete emission control solutions. Contact us today for a free quote or to learn more.