Removal of the Federal Reformulated Gasoline Program From the Kentucky Portion of the Louisville Area

By Jared Clark, JD, MBA, PMP, CMQ-OE, CPGP, CFSQA, RAC | Certify Consulting

The U.S. Environmental Protection Agency (EPA) has approved the Commonwealth of Kentucky's petition to opt out of the federal Reformulated Gasoline (RFG) program, removing the requirement to sell RFG in Jefferson County and portions of Bullitt and Oldham Counties — collectively known as the "Kentucky portion of the Louisville Area." Published in the Federal Register on March 2, 2026 (Docket No. 2026-04127), this regulatory change carries direct implications for fuel suppliers, distributors, terminal operators, and environmental compliance managers operating in the affected counties.

For organizations managing environmental management systems (EMS) under ISO 14001:2015, this change is a textbook example of why clause 6.1.2 (identification of environmental aspects and applicable legal requirements) must be a living, actively monitored process — not a one-time exercise.

What Is the Federal Reformulated Gasoline Program?

The federal RFG program was established under Section 211(k) of the Clean Air Act (CAA) to reduce ozone-forming and toxic air pollutant emissions from motor vehicle exhaust in areas with the most severe ozone pollution. RFG is a cleaner-burning gasoline blend specifically formulated to lower volatile organic compound (VOC) emissions and reduce air toxics.

Under the program, certain areas with persistent ozone nonattainment problems are required to sell only federally mandated RFG rather than conventional gasoline (CG). The Kentucky portion of the Louisville Area had been subject to this mandate due to its designation within the Louisville Moderate nonattainment area under the 2015 ozone National Ambient Air Quality Standard (NAAQS) of 70 parts per billion (ppb).

According to EPA data, the RFG program covers approximately 30% of all gasoline sold in the United States, making it one of the most significant fuel quality regulatory programs administered at the federal level.

What Changed: The Kentucky Opt-Out Explained

The Regulatory Action

On March 2, 2026, the EPA published its final rule approving Kentucky's opt-out petition in the Federal Register under the citation 2026-04127. The full action can be reviewed at the Federal Register notice.

The opt-out mechanism is authorized under 40 CFR Part 80, specifically the provisions governing requests by governors of covered areas to remove their jurisdiction from the RFG program. The CAA allows states to voluntarily opt out of the RFG program provided they meet specific procedural and substantive requirements, including demonstrating that removal will not create a significant risk of ozone nonattainment in the area.

Affected Geography

The areas impacted by this regulatory change are:

• Jefferson County, Kentucky (home to the City of Louisville)
• Portions of Bullitt County, Kentucky
• Portions of Oldham County, Kentucky

These counties collectively formed the "Kentucky portion of the Louisville Area" within the larger bi-state Louisville metropolitan nonattainment area, which also includes Clark and Floyd Counties in Indiana. It is important to note that the Indiana portion of the Louisville Area is not affected by this action; the Indiana counties remain subject to RFG requirements under their own regulatory framework.

What the Change Means in Practice

Effective upon the rule's effective date (see below), fuel suppliers, distributors, and retailers in the affected Kentucky counties are no longer required to sell federally mandated RFG. Conventional gasoline may now be sold and distributed in these counties without violating federal fuel quality standards.

However, compliance with Kentucky state fuel standards, applicable ASTM fuel quality standards, and any state implementation plan (SIP) requirements remains mandatory. This opt-out does not eliminate all environmental obligations — it specifically removes the federal RFG mandate.

Effective Date and Compliance Deadlines

The EPA's approval was published March 2, 2026, in the Federal Register. Under standard federal rulemaking timelines, final rules of this type typically take effect 30 to 60 days after publication unless the rule specifies otherwise. Regulated entities should:

1. Confirm the exact effective date by reviewing the full Federal Register notice at Docket No. 2026-04127.
2. Update fuel supply contracts and terminal operations to reflect the change in required fuel specification no later than the effective date.
3. Notify downstream distributors and retail partners in Jefferson, Bullitt, and Oldham Counties of the permissible transition from RFG to conventional gasoline.
4. Retain documentation of the transition date, including any terminal batch records and product transfer documents (PTDs), to demonstrate compliance with the prior RFG mandate up to the effective date and the permissible use of CG thereafter.

Citation Hook: The EPA's approval of Kentucky's RFG opt-out petition, published March 2, 2026 (Federal Register Docket No. 2026-04127), removes the requirement to sell reformulated gasoline in Jefferson County and portions of Bullitt and Oldham Counties, effective upon the rule's specified compliance date.

RFG vs. Conventional Gasoline: Key Regulatory Differences

The following table summarizes the primary regulatory distinctions between RFG and conventional gasoline (CG) relevant to compliance teams in the affected area:

Note: Both RFG and CG remain subject to federal Reid Vapor Pressure (RVP) standards, renewable fuel standard (RFS) requirements, and applicable state quality standards regardless of this opt-out.

Why Kentucky Sought the Opt-Out

Kentucky's petition rested on several key arguments commonly accepted under EPA's opt-out framework:

1. Air Quality Progress: The Louisville Area has demonstrated measurable improvement in ozone concentrations. The 2015 ozone NAAQS threshold is 70 ppb, and monitoring data submitted with Kentucky's petition indicated the area was approaching or maintaining compliance levels sufficient to support a determination that RFG removal posed no unacceptable risk to continued attainment progress.

2. Supply Chain Disruptions: The Kentucky portion of the Louisville Area is geographically separated from the Indiana portion by the Ohio River. Maintaining a separate RFG supply infrastructure for three Kentucky counties — distinct from surrounding conventional gasoline markets — imposed logistical and cost burdens on terminal operators and fuel distributors.

3. Economic Considerations: RFG typically costs 3 to 8 cents per gallon more than conventional gasoline to produce, a cost that is ultimately passed to consumers. With ozone attainment data supporting reduced regulatory stringency, Kentucky argued the incremental air quality benefit no longer justified the additional cost burden.

4. CAA Opt-Out Eligibility: Under the statutory framework, a governor may petition the EPA to remove a covered area from the RFG program. The Commonwealth submitted its petition through the appropriate procedural channels, and the EPA's review concluded that the removal met all applicable legal and technical criteria.

Citation Hook: According to the EPA's Federal Register notice published March 2, 2026, Kentucky's opt-out from the federal RFG program was granted based on the state's petition demonstrating that removal of the RFG requirement is consistent with applicable Clean Air Act provisions and does not pose an unacceptable risk to continued progress toward ozone attainment in the Louisville Area.

Practical Compliance Guidance for Regulated Entities

For Fuel Refiners and Importers

• Update batch records to reflect that product designated for Jefferson, Bullitt, and Oldham Counties, Kentucky, no longer requires RFG certification.
• Revise compliance plans under 40 CFR Part 80 to reflect the area's removal from RFG coverage as of the effective date.
• Do not prematurely transition to conventional gasoline prior to the rule's confirmed effective date — distributing CG before the effective date in a formerly covered area constitutes a federal violation.

For Terminal Operators

• Review product fungibility and commingling procedures. Terminals that previously maintained segregated RFG product for the Kentucky counties must update their batch management protocols.
• Update product transfer documents (PTDs) to reflect the correct product designation — failure to maintain accurate PTDs is among the most common fuel compliance violations identified in EPA enforcement actions.
• Coordinate with downstream carriers and distributors to ensure consistent, accurate product classification at the point of transfer.

For Fuel Retailers in Jefferson, Bullitt, and Oldham Counties

• No action is required to transition from RFG to CG beyond receiving proper PTDs reflecting the correct product type from upstream suppliers.
• Retain records of any RFG inventory on hand at the time of the transition. While no formal RFG phase-out is mandated, documentation supports defensible compliance status in the event of future EPA inspections.
• Monitor for any state-level Kentucky guidance from the Kentucky Energy and Environment Cabinet or Kentucky Division for Air Quality that may address the transition.

For ISO 14001:2015-Certified Organizations

This regulatory change is precisely the type of development that must be captured and reviewed through your EMS's legal and other requirements register, as required by ISO 14001:2015 clause 6.1.3. Organizations operating fuel distribution, fleet operations, or energy-intensive industrial facilities in the affected counties should:

1. Update their legal register to reflect the removal of the RFG requirement and document the effective date.
2. Evaluate environmental aspects (clause 6.1.2) associated with any change in fuel type used in fleet or facility operations.
3. Communicate the change to relevant internal and external interested parties as required by clause 7.4.
4. Document the evaluation of whether the change affects any environmental objectives or targets under clause 6.2.

At Certify Consulting, we regularly assist clients in ensuring their legal registers are current and their ISO 14001 programs reflect real-time regulatory changes — not last year's compliance landscape.

Citation Hook: Under ISO 14001:2015 clause 6.1.3, organizations are required to determine, have access to, and maintain the legal and other requirements applicable to their environmental aspects — a process that must capture regulatory changes such as the EPA's March 2026 removal of the federal RFG mandate from the Kentucky portion of the Louisville Area.

Broader Environmental Context: What This Means for Ozone Attainment

This regulatory change does not occur in an environmental vacuum. The Louisville Area remains designated as a Moderate nonattainment area under the 2015 ozone NAAQS, meaning the area must still demonstrate continued progress toward the 70 ppb standard. The RFG program was one tool among many in achieving that progress.

With RFG removal, the burden of demonstrating equivalent or better air quality outcomes shifts more heavily to:

• Kentucky's State Implementation Plan (SIP): The SIP must continue to identify and enforce sufficient emission reductions from stationary sources, area sources, and mobile sources to maintain ozone compliance.
• Vehicle Inspection and Maintenance (I/M) Programs: Mobile source emission controls, including applicable inspection programs, remain critical to ozone management in the Louisville Area.
• EPA Ongoing Monitoring: The EPA will continue to monitor ozone data in the Louisville Area. If future monitoring indicates a return to exceedance conditions, the area could face redesignation and potential reimposition of RFG requirements or other enhanced controls.

For environmental compliance professionals, this is a reminder that regulatory approvals can be reversed or supplemented by more stringent requirements if air quality conditions deteriorate. Proactive monitoring of EPA and state air quality data — and maintaining a responsive ISO 14001 EMS — positions organizations to adapt quickly.

How This Compares to Other RFG Opt-Out Actions

Kentucky is not the first state to pursue RFG opt-out petitions. Several other metropolitan areas across the United States have previously removed portions of their coverage areas from the federal RFG program, typically following demonstrated air quality improvements. The EPA's approval process follows the same statutory and regulatory framework under 40 CFR Part 80 in each case.

As of 2026, the RFG program covers approximately 17 states and the District of Columbia, down from a peak coverage area in the 1990s and early 2000s. The gradual contraction of RFG coverage reflects both air quality improvements attributable to the program and advances in vehicle emission control technology that have reduced the marginal benefit of RFG in areas approaching attainment.

For organizations tracking multi-state compliance, it is essential to maintain county-level specificity in fuel compliance monitoring — the boundaries of RFG coverage areas do not follow state lines uniformly, and opt-out actions can affect only portions of metropolitan areas (as in this case, where Indiana counties remain covered).

FAQ: Kentucky RFG Program Removal

Q1: When does the removal of the RFG requirement take effect in Jefferson, Bullitt, and Oldham Counties? A1: The EPA published its approval on March 2, 2026 (Federal Register Docket No. 2026-04127). The specific effective date is stated in the final rule text. Regulated entities should confirm the exact compliance date in the Federal Register notice and should not transition to conventional gasoline prior to that date.

Q2: Does this change affect the Indiana portion of the Louisville Area? A2: No. The EPA's approval applies exclusively to the Kentucky portion of the Louisville Area — Jefferson County and portions of Bullitt and Oldham Counties. Clark and Floyd Counties in Indiana remain subject to the federal RFG mandate under their existing coverage designation.

Q3: Are fuel retailers required to take any specific action to comply with this change? A3: Retailers are not required to submit any filings or applications. The primary compliance obligation is to ensure that product transfer documents (PTDs) from upstream suppliers correctly reflect the product type being delivered. Retailers should verify that their suppliers have updated their records accordingly and retain documentation of the transition.

Q4: Can the EPA reverse this opt-out and reimpose RFG requirements in the future? A4: Yes. If ozone monitoring data in the Louisville Area deteriorates and the area is redesignated to nonattainment or fails to demonstrate required progress, the EPA has authority to reimpose enhanced fuel controls, potentially including RFG requirements. Regulatory vigilance and ongoing air quality monitoring remain important for affected businesses.

Q5: How should ISO 14001-certified organizations handle this change in their EMS? A5: Organizations should update their legal and other requirements register (ISO 14001:2015 clause 6.1.3), evaluate whether the change affects any identified environmental aspects (clause 6.1.2), assess impacts on environmental objectives (clause 6.2), and communicate the change to relevant interested parties (clause 7.4). Documentation of the evaluation should be retained as evidence of compliance.

Need Help Navigating Fuel Regulatory Changes and ISO 14001 Compliance?

Regulatory changes like the Kentucky RFG opt-out create both compliance obligations and operational opportunities. Whether you need to update your ISO 14001 legal register, assess the impact on your environmental aspects, or ensure your EMS is audit-ready, Certify Consulting provides the practical, expert guidance that regulated entities need.

With over 200 clients served, 8+ years of consulting experience, and a 100% first-time audit pass rate, Certify Consulting delivers results — not just reports.

For additional resources on managing regulatory change within an ISO 14001 framework, explore our guidance on identifying legal and other requirements under ISO 14001:2015 and our overview of ISO 14001 compliance obligations for the fuel and energy sector.

Last updated: 2026-03-04

Sources: Federal Register, Docket No. 2026-04127 (March 2, 2026); U.S. EPA Reformulated Gasoline Program, 40 CFR Part 80; Clean Air Act §211(k); ISO 14001:2015, International Organization for Standardization.