Regulatory Update: EPA published a final rule on April 2, 2026 (Federal Register document 2026-06397) redesignating the Muskingum River area in Ohio from nonattainment to attainment for the 2010 SO2 National Ambient Air Quality Standard. The rule is effective April 2, 2026. It amends 40 CFR Parts 52 and 81.
The lesson in this case is not that an area got cleaner — that part is good news. The lesson is what it took to get there, and what it demands of you now.
Globe Metallurgical, the electric arc furnace operator at the center of this nonattainment story, paid a $2.6 million civil penalty and invested approximately $6.5 million in emissions controls. Ohio EPA issued Director's Final Findings and Orders in 2020, then replaced them in 2025 with updated emission limits. The state submitted a redesignation request in March 2025. EPA proposed approval in October 2025 and finalized it in April 2026.
That is a 15-year arc from the establishment of the 2010 SO2 standard to formal redesignation. For every ISO 14001 environmental manager reading this, the Globe Metallurgical case is a case study in what happens when environmental performance degrades to the point where regulatory enforcement has to do the work that a functioning environmental management system should have been doing all along.
There are also immediate, practical compliance implications for facilities in or near the redesignated area. Legal compliance registers need updating. New Source Review permitting obligations have shifted. The maintenance plan creates ongoing monitoring obligations that parallel ISO 14001 operational requirements. All of this demands action now.
What Is a SO2 Nonattainment Area?
The Clean Air Act directs EPA to establish National Ambient Air Quality Standards (NAAQS) for certain pollutants based on the best available science about their effects on human health and the environment. For sulfur dioxide, EPA established the current primary NAAQS on June 22, 2010: 75 parts per billion (ppb), measured as the three-year average of the annual 99th percentile of daily maximum 1-hour average concentrations.
When EPA designates an area as nonattainment, it means the area is not meeting that standard. Nonattainment creates a chain of legal obligations under Clean Air Act Title I, Part D:
- The state must develop a State Implementation Plan (SIP) with enforceable emission reduction strategies
- New major sources and major modifications in the area face nonattainment New Source Review (NSR) — which requires the lowest achievable emission rate (LAER) and emission offsets
- The state must demonstrate reasonable further progress toward attainment
- Facilities that are the primary contributors to the nonattainment designation typically become targets for compliance orders, permit conditions, and enforcement actions
The Muskingum River nonattainment area was designated under the 2010 SO2 NAAQS and centered on a single facility: Globe Metallurgical, Inc., located in Beverly, Ohio, which operates five electric arc furnaces. Electric arc furnace operations are significant SO2 sources because of the sulfur content in charge materials. The nonattainment area covered two townships: Center Township in Morgan County and Waterford Township in Washington County.
For ISO 14001 practitioners, nonattainment designations are exactly the type of legal and regulatory change that must be tracked under Clause 6.1.3 — identification of environmental legal and other requirements. They directly affect what emission limits apply to a facility, what permitting regime applies to new construction or modifications, and what monitoring, reporting, and recordkeeping the facility must maintain. When an area moves from nonattainment to attainment, those obligations shift — and your legal compliance register must reflect the change.
The Muskingum River Area: A History of Enforcement and Improvement
Globe Metallurgical's path from nonattainment to attainment did not happen through voluntary initiative. It happened through enforcement.
The progression is instructive:
- Globe paid a $2.6 million civil penalty for violations of environmental requirements — a direct financial consequence of failing to maintain adequate emission controls
- Globe invested approximately $6.5 million in emission controls for SO2 and particulate matter, required as part of the enforcement settlement
- Ohio EPA issued Director's Final Findings and Orders (DFFOs) to Globe in 2020, establishing binding emission limits
- In 2025, Ohio issued updated DFFOs — replacing the 2020 orders — with revised emission limits calibrated to provide for maintenance of the SO2 NAAQS going forward
- Globe's updated DFFOs were dated March 26, 2025
- Ohio submitted its redesignation request to EPA on March 31, 2025 — five days after the updated DFFOs were issued
The DFFOs are not just enforcement documents. Ohio incorporated them into its State Implementation Plan (SIP), making them federally enforceable as part of the approved SIP. That is what gives EPA confidence that the emission reductions are "permanent and enforceable" — one of the five statutory criteria that must be met before redesignation can be approved.
The Globe Metallurgical case illustrates a pattern that appears repeatedly in enforcement-driven attainment: the emissions problem was real, the enforcement response was proportionate, and the controls that resulted were effective. But none of that came cheaply or quickly. A functioning ISO 14001 environmental management system — with proper environmental aspects analysis, legal compliance evaluation, operational controls on furnace operations, and monitoring of SO2 emissions — should have identified and addressed these emission control gaps before a civil penalty was necessary.
That is the lesson. Not that enforcement works — it does — but that enforcement is far more expensive and disruptive than proactive compliance management.
What EPA Approved on April 2, 2026
The final rule published in the Federal Register on April 2, 2026 (document 2026-06397) took three distinct but related actions, each of which has compliance implications for facilities in and near the Muskingum River area.
Action 1: Redesignation from Nonattainment to Attainment
EPA officially redesignated the Muskingum River area — Center Township, Morgan County and Waterford Township, Washington County, Ohio — from nonattainment to attainment for the 2010 SO2 NAAQS (75 ppb). This amends 40 CFR Part 81, which is the regulatory register of area designations under the NAAQS program.
The redesignation is not a declaration that the pollution problem no longer exists. It is a determination that the area is now meeting the standard, that the improvement is due to real and enforceable emission reductions, and that Ohio has demonstrated it has the mechanisms in place to keep the area in attainment.
Action 2: Approval of Ohio's Maintenance Plan
Redesignation requires a maintenance plan under Clean Air Act Section 175A. The maintenance plan must demonstrate that the area will continue to meet the NAAQS for at least 10 years after redesignation. EPA approved Ohio's maintenance plan as a revision to Ohio's SIP, amending 40 CFR Part 52.
The maintenance plan is not a passive document. It commits Ohio to annual emissions inventory reporting, review of projected emissions against maintenance thresholds, and a comprehensive enforcement program as the contingency measure if emissions begin trending upward. These obligations parallel ISO 14001's monitoring and measurement requirements — they require ongoing data collection, trend analysis, and documented response to deviations.
Action 3: Incorporation of Globe Metallurgical's DFFOs into the SIP
EPA approved Ohio's incorporation of the March 26, 2025 DFFOs issued to Globe Metallurgical into the federally enforceable SIP. This is the enforcement instrument at the heart of the attainment demonstration. The DFFOs establish the specific SO2 emission limits for Globe's five electric arc furnaces that make the air quality modeling work.
By incorporating the DFFOs into the SIP, EPA has made these emission limits federally enforceable — meaning violations of the DFFOs can be pursued not only by Ohio EPA but by the federal EPA as well. For Globe, this means the emission limits are not subject to negotiation or voluntary modification. They are regulatory floor values, and operating above them carries federal enforcement exposure in addition to state-level liability.
The Five Criteria for Redesignation Under the Clean Air Act
Clean Air Act Section 107(d)(3)(E) sets out five criteria that must all be satisfied before EPA can redesignate a nonattainment area to attainment. Understanding these criteria matters for ISO 14001 practitioners because they define what "permanent and enforceable" air quality improvement actually requires — and they parallel the kind of evidence an auditor looks for in an ISO 14001 compliance evaluation.
| Criterion | What It Requires | How Ohio Satisfied It |
|---|---|---|
| 1. Attaining the NAAQS | Monitored air quality data must show the area is meeting the standard | Ambient SO2 monitoring data demonstrated attainment of the 75 ppb standard |
| 2. Fully approved applicable SIP | EPA must have fully approved the state's SIP for the area | Ohio's applicable SIP was fully approved by EPA |
| 3. Permanent and enforceable reductions | Air quality improvement must result from reductions that cannot be reversed | Globe's DFFOs (incorporated into SIP) establish binding emission limits; $6.5M in installed control equipment |
| 4. CAA Section 110 and Part D requirements met | State must have fulfilled all general SIP and nonattainment SIP requirements | Ohio demonstrated full compliance with applicable statutory requirements |
| 5. Fully approved maintenance plan | State must have a plan demonstrating continued attainment for 10 years | Ohio's maintenance plan approved as SIP revision |
All five criteria must be satisfied simultaneously. EPA cannot approve a redesignation if any one is missing. This is why the sequence matters: Ohio issued updated DFFOs on March 26, 2025 — establishing the "permanent and enforceable" emission limits — and submitted its redesignation request five days later. The DFFOs were the final piece of the statutory puzzle.
Maintenance Plan Obligations: What Continues After Redesignation
Redesignation is not the end of the story. Under Clean Air Act Section 175A, Ohio must demonstrate continued attainment for 10 years post-redesignation. That means the maintenance plan creates durable obligations that persist well beyond the April 2, 2026 effective date.
Annual Emissions Inventory and Reporting
Ohio must submit annual SO2 emissions reports to EPA covering sources in the Muskingum River area. These reports verify that actual emissions remain within the maintenance demonstration — that the air quality model used to show continued attainment still reflects reality.
For Globe Metallurgical, this means the facility's actual SO2 emissions will be reviewed against the DFFOs and the maintenance plan emissions projections on an ongoing basis. Any significant upward trend in reported emissions would trigger scrutiny under the maintenance plan's contingency provisions.
Annual Emissions Inventory Review
Ohio must review projected emissions inventories each year to ensure they remain consistent with the attainment demonstration. If new sources enter the area, if Globe expands capacity, or if control equipment degrades, the projected inventory could shift — and the state would need to evaluate whether the maintenance threshold is still being met.
Contingency Measures
Ohio's maintenance plan addresses contingency through its comprehensive state enforcement program. If SO2 concentrations begin approaching the NAAQS threshold, the state has authority to pursue enforcement actions against contributing sources — including modification of Globe's DFFOs if necessary to tighten emission limits further.
This is an important structural point for ISO 14001 practitioners: the maintenance plan's contingency mechanism is enforcement, not a new voluntary commitment. If emissions trend upward, the state's response is regulatory action. Facilities in the area that are SO2 sources need to understand that the maintenance plan framework keeps regulatory attention focused on this area for at least a decade.
What This Means for ISO 14001 Facilities: Practical Compliance Guidance
The Muskingum River redesignation has immediate, concrete implications for ISO 14001 facilities in or near the affected area. But it also illustrates principles that apply to any ISO 14001 facility tracking area designations as part of its legal compliance program.
1. Update Your Legal Compliance Register (ISO 14001 Clause 6.1.3)
ISO 14001 Clause 6.1.3 requires organizations to identify and have access to applicable legal requirements related to their environmental aspects, and to determine how those requirements apply. Area designation status under the NAAQS program is exactly the type of regulatory requirement that belongs in a legal compliance register.
When an area is redesignated, two things change in your register:
- Remove or update nonattainment NSR references. The nonattainment NSR program (requiring LAER and emission offsets for major modifications) no longer applies in the redesignated area. Entries referencing nonattainment NSR applicability need to be updated.
- Add or update PSD references. Prevention of Significant Deterioration (PSD) now applies in the area for major new sources and major modifications. PSD requires best available control technology (BACT) analysis and increment review, but does not require emission offsets. The compliance burden is different — not necessarily lighter, but different.
For facilities that are not Globe Metallurgical but are nonetheless located in Center Township, Morgan County or Waterford Township, Washington County, this permitting shift is real and immediate. Any facility planning a major modification should confirm with its environmental counsel whether the change from nonattainment NSR to PSD affects the permitting approach for the planned project.
2. Incorporate Facility-Specific Orders (DFFOs) into Your EMS
Globe Metallurgical's DFFOs are now part of the federally enforceable SIP. For Globe specifically, this means the emission limits in the DFFOs are not merely Ohio EPA requirements — they are federal requirements enforceable by EPA directly.
This has implications for how Globe's environmental management system should be structured:
- Legal compliance register: The DFFOs must be captured as a specific legal requirement, with the applicable emission limits documented and linked to the five electric arc furnaces they govern
- Operational controls (Clause 8.1): The process controls, charge material specifications, and pollution control equipment that keep emissions within DFFO limits must be documented as operational controls and maintained in accordance with the EMS
- Monitoring and measurement (Clause 9.1.1): SO2 emission monitoring at the furnaces must be documented as a monitoring requirement, with frequency, method, and acceptable range tied to the DFFO limits
- Compliance evaluation (Clause 9.1.2): Periodic evaluation of compliance with the DFFO limits must be conducted and documented — with records retained to demonstrate ongoing compliance
Other facilities with facility-specific compliance orders — consent decrees, administrative orders on consent, Director's Orders, or similar instruments — should apply the same logic. When a compliance order is incorporated into a federally enforceable SIP, the compliance stakes rise. Your EMS must treat it accordingly.
3. Track Area Designation Changes as Part of Your Legal Register Maintenance Process
Most ISO 14001 facilities have a process for reviewing changes in applicable regulations — typically an annual or semi-annual review of EPA rulemakings, state regulatory updates, and permit conditions. Area designation changes need to be part of that process.
EPA periodically publishes lists of areas being considered for redesignation, proposed redesignation rules, and final redesignation rules in the Federal Register. Facilities with significant air emissions should monitor these rulemakings through:
- EPA's NAAQS designations page, which lists current nonattainment areas by pollutant and state
- Federal Register alerts for 40 CFR Part 81 amendments, which is where area designation changes are codified
- State environmental agency notifications, which typically announce redesignation submissions and approvals affecting facilities in the state
The Muskingum River redesignation was proposed October 2, 2025 (90 FR 47686) and finalized April 2, 2026. A facility with an active legal register review process would have seen the proposed rule in October 2025 and had months to prepare for the compliance implications before the final rule took effect.
4. Manage SO2 Emission Limits Within Your EMS Operational Controls
For any facility with SO2 as a significant environmental aspect — smelters, electric arc furnace operators, fossil fuel combustion sources, chemical manufacturers — SO2 emission limits are a primary compliance obligation that must be anchored in operational controls.
An effective ISO 14001 operational control framework for SO2 typically includes:
- Documented procedures for operating pollution control equipment (scrubbers, baghouses, electrostatic precipitators) that affect SO2 capture efficiency
- Charge material specifications that limit sulfur content in raw materials (relevant for furnace operators like Globe)
- Emission monitoring protocols that define how SO2 emissions are measured, how frequently, and who reviews the data
- Deviation response procedures that define what happens when monitored emissions approach or exceed permit limits — including notification requirements, production adjustments, and corrective action timelines
- Preventive maintenance schedules for emission control equipment, with records demonstrating equipment was maintained as required
Globe Metallurgical's $6.5 million in emission control investments — made under enforcement pressure — installed the hardware needed to meet the DFFO limits. The ISO 14001 question is whether the operational control documentation now reflects how that equipment is operated, maintained, and monitored on an ongoing basis. Hardware without operational controls documentation is a finding waiting to happen at an ISO 14001 certification audit.
5. Understand the New Source Review Implications of Redesignation
The shift from nonattainment NSR to PSD is consequential for any facility in the redesignated area that is considering construction of new major sources or major modifications to existing sources.
Under nonattainment NSR, a facility proposing a major modification that would increase SO2 emissions above the significant emissions rate threshold would have been required to:
- Meet the Lowest Achievable Emission Rate (LAER) for SO2
- Obtain SO2 emission offsets at a ratio greater than 1:1
- Demonstrate that all major stationary sources the applicant owns in the same nonattainment area are in compliance with applicable requirements
Under Prevention of Significant Deterioration (PSD), which now applies in the redesignated area, a facility proposing a significant modification would instead be required to:
- Meet Best Available Control Technology (BACT) for SO2 (which may or may not be the same as LAER)
- Demonstrate that the project does not cause or contribute to a violation of any NAAQS or exceed the applicable PSD increment
- No emission offsets are required
The elimination of the offset requirement can significantly reduce the cost and complexity of major modification projects. However, the BACT analysis under PSD is still a rigorous, case-by-case review that can result in stringent emission limits for new equipment. Facilities should not assume that PSD means a lighter-touch permit review — it means a different permit review, with different requirements and different outcomes.
6. What the Globe Metallurgical Enforcement History Teaches About Proactive Compliance
The specifics of what triggered Globe's original enforcement action are not detailed in the redesignation rulemaking. But the sequence of events — nonattainment designation, civil penalty, enforcement-required capital investment, compliance orders, updated compliance orders — is a pattern that ISO 14001 practitioners recognize as the consequence of inadequate environmental management.
A $2.6 million civil penalty and $6.5 million in capital expenditures is, in rough terms, a $9 million consequence. For a facility operating five electric arc furnaces, that is a very large number. ISO 14001 implementation — even a thorough, well-resourced implementation — costs a small fraction of that amount. The upfront investment in environmental aspects identification, legal compliance tracking, operational controls, and monitoring is what makes enforcement actions preventable.
This is not a hypothetical argument. It is arithmetic. When environmental management systems are functioning properly, the enforcement cases that generate these outcomes typically do not develop. Problems get identified early through internal monitoring and audit processes, corrective actions are implemented before they become violations, and the facility maintains documented evidence of its compliance efforts.
The Globe Metallurgical case is a concrete example of what this arithmetic looks like when it goes the other direction.
Key Dates and Deadlines
| Event | Date | Significance |
|---|---|---|
| 2010 SO2 NAAQS established | June 22, 2010 | 75 ppb primary standard under Clean Air Act; triggered nonattainment designations |
| Original DFFOs issued to Globe Metallurgical | 2020 | Binding emission limits established as first enforcement instrument |
| Updated DFFOs issued to Globe Metallurgical | March 26, 2025 | Revised emission limits calibrated to support maintenance of NAAQS; incorporated into SIP |
| Ohio redesignation request submitted to EPA | March 31, 2025 | State formal request triggering EPA review process |
| EPA proposed rule published | October 2, 2025 (90 FR 47686) | Document 2025-19278; public comment period opened |
| EPA final rule published and effective | April 2, 2026 | Document 2026-06397; 40 CFR Parts 52 and 81 amended; redesignation official |
| Maintenance plan monitoring period begins | April 2, 2026 | Ohio's 10-year maintenance obligation commences; annual inventory reporting required |
| Maintenance plan demonstration period ends | Approximately 2036 | Ohio must demonstrate continued attainment through at least this date |
The immediate compliance action for facilities in the redesignated area is updating legal compliance registers to reflect the change from nonattainment to attainment status and the corresponding shift in NSR permitting applicability. This should occur promptly — the rule is already effective.
Conclusion: Redesignation as a Compliance Management Signal
The EPA's Air Plan Approval for the Ohio Muskingum River 2010 Sulfur Dioxide Redesignation and Maintenance Plan (Federal Register document 2026-06397, effective April 2, 2026) is a genuine environmental success story. The air in Center Township, Morgan County and Waterford Township, Washington County, Ohio is cleaner. The NAAQS is being met. The emission reductions are permanent and enforceable.
But the path to this outcome — enforcement action, civil penalty, capital investment, compliance orders, years of regulatory oversight — is exactly what ISO 14001's environmental management framework is designed to prevent. The standard exists to put the compliance function inside the organization, operating continuously, rather than leaving it to be imposed from outside through enforcement.
For ISO 14001 practitioners, this redesignation is a reminder to treat area designation changes as genuine compliance events, not administrative footnotes. When an area's status changes, the applicable regulatory requirements change. Your legal compliance register, your operational controls, your monitoring program, and your permitting strategy all need to reflect the new reality.
If you manage environmental compliance for a facility with air emissions in Ohio or any other state where area designations are shifting, and you want to make sure your ISO 14001 environmental management system is capturing these changes accurately — that your legal register is current, your operational controls are defensible, and your monitoring program would hold up to scrutiny — Certify Consulting provides ISO 14001 consulting, gap assessments, and legal compliance register development for manufacturers and industrial facilities across the country.
The Globe Metallurgical case shows what the regulatory system looks like when it has to step in. The ISO 14001 system exists so it does not have to.