Ohio's Air Nuisance Rule SIP Removal: What Actually Changes Monday Morning for Industrial Operators
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Ohio's Air Nuisance Rule SIP Removal: What Actually Changes Monday Morning for Industrial Operators

EPA's May 2026 proposal removes Ohio's Air Nuisance Rule from the federal SIP. Practitioner read on permits, citizen suits, state enforcement, and what does not change.

by iSi Environmental

Ohio’s Air Nuisance Rule SIP Removal: What Actually Changes Monday Morning for Industrial Operators

On May 28, 2026, EPA published a proposed action (91 FR 31688) to remove Ohio’s Air Nuisance Rule — OAC 3745-15-07 — from the federally enforceable Ohio State Implementation Plan. The trade press framed it as a deregulatory milestone. The Ohio Manufacturers’ Association called it a “big win.” A few environmental groups have already signaled litigation.

We will leave the political read to other writers. The question an Ohio plant manager actually needs answered Monday morning is narrower: what changes on my desk, what does not, and what should my compliance program do differently this week?

The short answer: less than the headlines suggest, but more than zero. The longer answer is below.

What Does Not Change

Every numeric emission standard your facility operates under is unaffected by this proposed action. That includes:

  • All conditions in your existing Title V or state-issued air permit
  • Federal NESHAP and NSPS obligations under 40 CFR Parts 60, 61, and 63
  • NSR and PSD review obligations on any modification or new source
  • Continuous emissions monitoring, recordkeeping, and reporting requirements
  • Federal HAP and criteria pollutant limits

If you came into Monday with a permit excursion to investigate, an annual emissions inventory due, or a stack test on the calendar, none of that moves. The proposed SIP removal is jurisdictional, not substantive. It addresses who can enforce a particular rule in which court, not what is allowed to come out of your stacks.

That distinction matters because it is the single most common misread of this development we are hearing in the field. A site manager who walks into a meeting believing “the nuisance rule is gone” and adjusts behavior accordingly is making a decision on a misreading of the proposal.

What OAC 3745-15-07 Actually Says

The Air Nuisance Rule prohibits “emissions of smoke, ashes, dust, dirt, grime, acids, fumes, gases, vapors” or similar substances in quantities that “endanger the health, safety or welfare of the public, or cause unreasonable injury or damage to property” (OAC 3745-15-07).

That language has been part of Ohio’s regulatory fabric since 1974, when it entered the state code as Ohio rule AP-2-07. It was approved into the federally enforceable SIP in its amended form on August 13, 1984 (91 FR 31688). That 1984 incorporation is what created federal enforcement authority. For 42 years, EPA Region 5 has been able to enforce the rule directly, and citizen plaintiffs have been able to use it as the predicate for federal-court actions under Clean Air Act Section 304.

The rule is broad on purpose. Its function in the enforcement system has historically been as a backstop — a basis for action when specific permit-condition or NAAQS violations were hard to prove but cumulative odor, particulate, or fume impacts on neighbors were documented.

What Actually Changes If EPA Finalizes the Removal

Two things, both narrow:

Federal enforcement of OAC 3745-15-07 ends. EPA Region 5 loses the ability to bring federal enforcement actions citing the rule. Civil penalties under Clean Air Act Section 113(b), currently up to $123,811 per day per violation under the 2024 inflation adjustment (40 CFR 19.4), no longer attach to ANR-only violations.

Federal-court citizen suit exposure on ANR claims ends. Section 304 of the Clean Air Act allows private parties to sue in federal district court over SIP violations (42 USC 7604). Once the ANR is out of the SIP, it is no longer a SIP violation, and the federal-court door closes on that specific theory. Environmental organizations in Ohio — Sierra Club, the Ohio Environmental Council, and others — have used ANR as a citizen-suit predicate. That tool is removed from their federal-court inventory.

That is the whole list. Those two changes are real, and for facilities historically exposed to either vector they are meaningful. They are not transformative for a typical plant.

What Quietly Does Not Change

The state rule stays on the books. OAC 3745-15-07 was driven out of the SIP by HB 96, signed in June 2025 as part of Ohio’s 2026–2027 operating budget and effective October 1, 2025 (Bricker Graydon). That law prohibits the Ohio EPA Director from including any “air nuisance rule” in the federal SIP submittal. It does not eliminate the rule from Ohio Administrative Code.

Ohio EPA can still enforce OAC 3745-15-07 under state authority. State-court actions remain available. The case law, procedural mechanics, and remedy structures differ from the federal track, but the rule itself is still live regulatory law in Ohio.

Community complaint patterns also do not change. The neighborhoods around rendering plants, foundries, asphalt batch plants, ethanol facilities, coke ovens, and waste-handling sites do not read the Federal Register. The odor, the particulate fallout, and the visible plume issues that historically drove ANR complaints will continue to drive complaints — they will simply route through state mechanisms and through political channels instead of federal court.

For multi-site corporate operators, this is the practical headline: federal exposure narrows, state exposure and community pressure continue. Your community engagement program, odor management program, and complaint response protocols should not relax. They were never primarily federal-enforcement instruments; they were operational and reputational instruments.

The Litigation Outlook — A Counter-Signal Worth Naming

The “removal is final” framing in some trade press is premature. Environmental groups have indicated they will challenge any EPA final action. Practitioners should plan for 12–24 months of litigation uncertainty after EPA finalizes, during which the federal enforceability status of the ANR may be contested in court.

There is procedural history here. In November 2020, EPA removed the ANR from the SIP using its error-correction authority under Clean Air Act Section 110(k)(6). On February 10, 2023, the Sixth Circuit remanded that removal without vacatur — a procedural ruling about how EPA conducted the removal, not a substantive ruling that the ANR had to remain in the SIP (Bricker Graydon). In January 2025, EPA reinstated the rule. In June 2025, Ohio’s legislature directed Ohio EPA to remove it again. In May 2026, EPA proposed to do so through the standard SIP revision process.

The 2026 proposal is structured to address the procedural deficiencies the Sixth Circuit identified in 2023, which is one reason it is more likely to be durable than the 2020 removal was. But “more likely durable” is not “settled.” Plan for an extended period in which the federal enforceability of the ANR is contested in court even after EPA’s final action.

Why Other States Are Not Following

This is the second counter-signal worth naming because we hear the question often from multi-state operators: is this a trend?

It is not. Kentucky, Michigan, Pennsylvania, Indiana, and Illinois all retain general nuisance provisions in their SIPs. None of those legislatures has passed an HB 96 analog. The Ohio change is the product of a specific state legislative mandate that other peer industrial states have not enacted (EPA SIP approvals).

For iSi’s primary service region — Kansas, Missouri, Nebraska, Oklahoma, and Texas — there is no analogous SIP-incorporated air nuisance rule to remove. State common-law nuisance and state environmental statutes continue to govern nuisance-type claims in those jurisdictions. A multi-state operator with Ohio facilities should not extrapolate the Ohio change to its non-Ohio sites.

If you have a corporate compliance program that treats SIP-incorporated nuisance rules as a single risk category across all states, this is a good moment to break that category apart by jurisdiction.

The Comment Period

EPA’s proposed action triggered a 30-day public comment window. Comments are due approximately June 27, 2026 (91 FR 31688). Industrial operators who want the removal finalized should comment to strengthen the administrative record. Environmental organizations will comment to oppose. Whether to file is a corporate-position question, not a compliance question — but if your firm has a position, the window to put it on the record is narrow.

A Five-Point Compliance Program Update Checklist

For an Ohio multi-site operator, here is the practical week-of work this proposal generates:

1. Update the federally enforceable obligations inventory. Most corporate compliance trackers maintain a list of federally enforceable rules per facility. If yours treats OAC 3745-15-07 as a SIP obligation, flag it for status change pending EPA’s final action. Add a state-enforceability tag so the rule does not drop out of the inventory entirely.

2. Revise internal compliance training. Materials that describe nuisance enforcement in Ohio as a federal pathway need a footnote. The federal pathway narrows if EPA finalizes; the state pathway continues. Operators trained on the old framing will misunderstand their actual exposure.

3. Continue community engagement and complaint response without modification. This is the highest-stakes line item on the list. The temptation to read this proposal as a green light to reduce odor management investment, complaint logging discipline, or proactive emissions control is the most expensive mistake available right now. The community pressure that drove ANR complaints is unchanged. State enforcement remains. And the reputational and operational consequences of being the facility neighbors complain about — permit renewal opposition, modification permit challenges, local political headwinds on expansion — do not move because EPA reorganizes its enforcement authority.

4. Brief counsel on any pending federal ANR enforcement. If your facility is in an active EPA Region 5 enforcement action or pending Section 304 citizen suit citing OAC 3745-15-07, get counsel involved on the transition mechanics. Pending federal actions may be affected differently than already-resolved actions, and the timing of EPA’s final action matters.

5. Hold capital project permitting workflows constant. This proposal does not change permit limits, NESHAP/NSPS obligations, or NSR/PSD review for capital projects. If you are planning a new emissions unit, a Title V modification, or a synthetic minor permit application in Ohio, the permitting work is unchanged.

Practitioner Read

The Ohio Air Nuisance Rule SIP removal is meaningful but narrow. For facilities historically exposed to EPA Region 5 enforcement or to Section 304 citizen suits citing the rule, the change reduces real federal-court risk. For everyone else, the practical day-to-day operational change is minimal.

The headline framing in the trade press understates the litigation uncertainty ahead and overstates the operational impact on a typical plant. The community complaint patterns that drove ANR enforcement do not change. The state rule does not disappear. Peer industrial states are not following Ohio’s path. The right posture for a corporate compliance function is to update the federal enforceability inventory, retrain the people who need retraining, and hold every other element of the program steady.

How iSi Helps

iSi works with industrial operators across 40 states on the recurring compliance program work that this kind of regulatory development requires: federal and state enforceability inventory updates, training revisions, community engagement and complaint response continuity, and Title V, NESHAP, and NSR permit work. For multi-state operators with Ohio facilities sitting inside a larger compliance program, the value of a single team tracking how a jurisdiction-specific change like this maps across the rest of the portfolio is what the iSi COOP retainer is for. We are not the law firm you call after a notice of violation arrives. We are the team that keeps the program tight enough that the notice of violation does not arrive in the first place.

If your facility sits in Ohio and you want a second read on what this proposal actually changes for your plant, the Compliance Gap Checker is the fastest way to start a conversation.

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