Missouri's 2026 Air Construction Permit Fees: What Manufacturers Need to Budget Before Their Next Project

If you are scoping a capital project at a Missouri manufacturing plant in 2026 — a new coater, a replacement boiler, a second spray booth, an added production line — the air construction permit is no longer a rounding error in your project budget.

On January 1, 2026, the Missouri Department of Natural Resources (MDNR) Air Pollution Control Program put a new construction-permit fee schedule into effect under 10 CSR 10-6.060. Filing fees for major permits — New Source Review, Prevention of Significant Deterioration, and Hazardous Air Pollutant permits — now run $6,000 each, plus $100 per hour of MDNR processing time. The hourly processing fee is uncapped. A large or complicated project can easily add tens of thousands of dollars on top of the filing fee before the first piece of equipment is installed.

The fee update itself went into effect at the state level on February 28, 2025, with the new dollar amounts applying to applications submitted on or after January 1, 2026. EPA’s approval of the revised rule — including the updated fee structure — was published in the April 23, 2026 Federal Register and becomes federally effective on May 26, 2026. That last date matters: once EPA’s SIP approval is in force, the state rule is federally enforceable under CAA sections 110 and 113. The fee schedule is not a soft state-only matter anymore. It is baked into the federally enforceable permit program.

Here is what manufacturers, portable operators, and capital-project teams in Missouri need to know before filing the next application.

What Changed on January 1, 2026?

MDNR’s air construction permit program is a two-part fee model: a fixed filing fee tied to the permit class, plus — for most classes — an hourly processing fee of $100 per hour. The full 2026 schedule, published on the MDNR Air Construction Permits page, looks like this:

Permit Type	10 CSR 10-6.060 Section	Filing Fee	Processing Fee
Portable Source Relocation	(4)	$300	None
Minor (De Minimis)	(5)	$300	$100/hour
General Permit	(6)	$700	None
New Source Review (Major)	(7)	$6,000	$100/hour
Prevention of Significant Deterioration (PSD)	(8)	$6,000	$100/hour
Hazardous Air Pollutant (HAP)	(9)	$6,000	$100/hour
Initial Plantwide Applicability Limit (PAL)	(7) or (8)	$6,000	$100/hour
Renewal PAL	(7) or (8)	$3,500	$100/hour
Temporary / Pilot	(10)	$250	$100/hour
Permit Amendment	(11)	None	$100/hour

Source: MDNR Air Construction Permits — 2026 Fee Table

The shape of the schedule tells you where MDNR is focusing the cost burden. Major permits — NSR, PSD, HAP, and the initial PAL — all share the same $6,000 filing floor. Processing is billed hourly on top. Minor permits (Section 5) and temporary permits (Section 10) carry modest filing fees but still bill hourly processing. Portable source relocations ($300) and general permits ($700) are flat. Permit amendments have no filing fee but are fully hourly.

Why the $6,000 Filing Fee Lands Hardest on Major Sources

The biggest budget impact is on facilities that pull NSR, PSD, or HAP permits — in other words, the major manufacturing, energy, and chemical operations that already have the most complex compliance obligations in the state. A typical NSR application for a midsize manufacturing addition in Missouri can pull 40 to 100 hours of MDNR review before issuance, depending on pollutant load, modeling requirements, and how much back-and-forth happens between the applicant and the Department. At $100 per hour, that is another $4,000 to $10,000 on top of the filing fee — and projects with BACT analysis, air dispersion modeling, or stack testing coordination routinely run higher.

For a plant planning a major project in 2026, a realistic all-in permit-fee budget for a Section 7 or Section 8 permit should sit between $10,000 and $20,000 before any cost of outside technical support, modeling contractors, or third-party stack testing. That is not a rounding error — it is a budget line.

PAL (Plantwide Applicability Limit) permits share the same $6,000 filing floor on the initial application. A PAL renewal drops to $3,500. The PAL structure lets a major source manage growth across multiple units under a single plantwide cap, which can be the better long-term answer for a facility that expects multiple modifications inside a 10-year window. The upfront fee is real, but so is the administrative relief on follow-on projects.

The Permit Classes That Catch Small and Mid-Size Operators

Not every Missouri operator hits the $6,000 major-permit tier. But the 2026 schedule also raises real dollars on permit classes that small and mid-size operators use routinely:

Portable source relocations (aggregate crushers, portable asphalt plants, portable concrete) now pay $300 per relocation filing. For operators moving equipment between multiple sites in a season, that is a meaningful recurring cost.
General permits — $700 filing, no hourly processing — cover standardized operations like livestock markets, crematories, surface-coating operations, and small printing facilities that qualify for Permit-by-Rule.
Minor construction permits (Section 5) carry a $300 filing plus $100-per-hour processing. Even a simple minor addition — a new dust collector, a solvent-recovery unit — will draw processing hours.
Permit amendments carry no filing fee but bill entirely hourly. That sounds cheap until a facility submits a handful of amendments over a permit’s life.

For operators who typically handle air permitting through a consultant or a contract permit coordinator, the 2026 schedule changes the conversation about what is worth pursuing internally versus outsourcing. A clean, well-scoped application cuts processing hours. A sloppy submittal runs the hourly meter.

The State Effective Date Versus the Federal Effective Date

The 2026 fee schedule has two effective dates you need to track, and they are not the same thing.

The state-level revision to 10 CSR 10-6.060 took effect on February 28, 2025, per the EPA’s final rule published on April 23, 2026. The new fee table began applying to applications filed on or after January 1, 2026, per the schedule published on the MDNR Air Construction Permits page.

EPA’s approval of the same rule revision — incorporated into the Missouri State Implementation Plan at 40 CFR 52.1320 — becomes federally effective on May 26, 2026. That matters because once the federal approval is in force, the rule is enforceable not just by MDNR but by EPA Region 7 under CAA sections 110 and 113. For any project that triggers NSR or PSD review, that shift makes the construction-before-permit risk a federal enforcement question, not just a state one.

Petitions for judicial review of EPA’s April 23, 2026 final approval must be filed in the appropriate U.S. Court of Appeals by June 22, 2026 under CAA section 307(b)(1). As of the date of this article, no such petitions have been announced.

Don’t Forget the 18-Month and 2-Year Construction Clocks

One detail that operators miss every year: a Missouri construction permit does not expire on a fixed calendar date, but it will void if construction does not start inside the permit’s time window. MDNR’s Construction Permits overview specifies the windows:

Major projects: construction must begin within 18 months of permit issuance.
Minor projects: construction must begin within 2 years of permit issuance.

A permit that voids because the construction window lapsed requires re-permitting — and re-paying — under whatever fee schedule is in effect at re-application. Given that the 2026 schedule just took the major-permit filing fee to $6,000, a permit that voids and has to be re-filed under the 2026 rules is an avoidable out-of-pocket hit on the capital budget.

This is one of the specific reasons a plant should not apply for a major air permit before the capital project is funded and scheduled. Timing the application to permit the build, rather than permitting the capital plan, protects both the construction window and the permit fee.

What This Means for Multi-State Operators

If your facility network crosses into Kansas, Oklahoma, Nebraska, Iowa, or Arkansas, the Missouri 2026 fee schedule is a state-only change. Neighboring states run separate fee tables under different regulations:

Kansas operates under K.A.R. 28-19 through KDHE’s Bureau of Air.
Oklahoma operates under OAC 252:100 through DEQ’s Air Quality Division.
Nebraska runs Title 129 through NDEE.
Arkansas runs Regulation 26 through ADEQ.
Iowa runs Chapter 567-22 through Iowa DNR.

Operators siting distribution networks, compressor stations, multi-state manufacturing, or energy infrastructure should budget state by state. Do not assume Missouri’s 2026 numbers flow through to neighboring SIPs. They do not.

Practical Budget and Process Steps Before Your Next Application

If you are planning a 2026 or 2027 air construction permit in Missouri, here are the specific steps that prevent the 2026 fee schedule from becoming a budget surprise:

Run applicability early. Use MDNR’s Permit Applicability Determination flow charts (criteria pollutants and HAPs) to confirm the permit class. Some projects can be scoped to stay in a de minimis or minor tier; some cannot. Identify the class before you finalize equipment selection.
Budget the filing fee plus 60 to 100 hours of processing for major permits. For NSR, PSD, and HAP permits, the all-in fee is rarely the $6,000 filing fee alone. A realistic planning number is $10,000–$20,000 on a mid-complexity project, more on an air-modeling-heavy application.
Consider a PAL if you expect multiple modifications. A PAL carries a $6,000 initial filing fee but reduces the administrative load on follow-on modifications under the plantwide cap. For a facility that expects to modify more than once in a 10-year window, the math often favors a PAL.
Keep Permit-by-Rule and general-permit options in the toolkit. Crematories, animal incinerators, livestock markets, printing operations, and surface-coating operations have Permit-by-Rule notification forms that route through the $700 general permit path. If you qualify, take it.
File a clean, complete application. The $100-per-hour processing fee is the lever you can actually pull. Applications that arrive complete — with accurate emission calculations, the right forms (MO 780-1323 for Authority to Construct, MO 780-2803 for Portable Source Relocation, the PBR notification forms for covered operations), modeling files where required, and a clean narrative of the project — process faster and cost less.
Do not start construction before permit issuance unless you have obtained a Pre-Construction Prohibition Waiver (PUB2014). Construction-before-permit is the most reliable way to turn a routine permit application into an enforcement action.
Track the 18-month and 2-year construction clocks. Calendar them into the capital project schedule. A voided permit that has to be re-filed under 2026 fees is an avoidable cost.

When iSi Steps In

iSi supports Missouri manufacturers with the full air construction permit workflow — applicability determinations, emission calculations, modeling coordination, Authority to Construct preparation, Permit-by-Rule notifications, and amendments. On major NSR, PSD, and HAP applications, a clean submittal is the single biggest factor in keeping MDNR’s hourly processing clock inside a predictable range. If your 2026 or 2027 capital project involves an air construction permit and you want the permit-fee budget locked in before capital committee, the next step is a 30-minute scoping call.