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Fifth Circuit Upholds EPA Disapproval of Texas Ozone SIP Under Clean Air Act Good Neighbor Provision

State of Texas v. United States Environmental Protection Agency U.S. Court of Appeals, Fifth Circuit 23-60069 resolved
By Joel Reese · July 20, 2026 U.S. Court of Appeals, Fifth Circuit

The Fifth Circuit rejected Texas's challenge to EPA's disapproval of its state implementation plan for managing ozone emissions under the Clean Air Act's Good Neighbor provision, holding that EPA reasonably interpreted the statute to require evaluation of impacts on downwind areas measuring clean data but potentially struggling to maintain air quality standards. The court denied Texas's motion to strike documents from the administrative record and upheld EPA's authority to disapprove state plans that fail to adequately demonstrate compliance with statutory requirements.

Fifth Circuit Clean Air Act EPA Regulatory Authority State Implementation Plan Ozone Emissions

Background and Procedural History

The State of Texas and the Texas Commission on Environmental Quality petitioned for review of an EPA rulemaking that disapproved Texas's proposed state implementation plan (SIP) for compliance with the Clean Air Act's Good Neighbor requirements. The Good Neighbor provision requires upwind states to manage their ozone pollution so that emissions do not prevent downwind states from attaining or maintaining federal air quality standards. Industry members intervened in support of Texas, and the petitioners moved to strike certain documents from the administrative record relating to EPA's Cross-State Air Pollution Rule (CSAPR) update.

The Core Dispute: Scope of Good Neighbor Obligations

Texas challenged EPA's disapproval on multiple grounds, including procedural arguments that EPA failed to meet the CAA's 12-month deadline for acting on SIP submissions and substantive arguments regarding EPA's interpretation of the Good Neighbor provision. The central legal question was whether EPA reasonably interpreted the Clean Air Act to require Texas to evaluate potential impacts on areas currently measuring clean data but that might have issues maintaining air quality, and whether EPA could disapprove a SIP based on the state's failure to adequately demonstrate compliance with statutory requirements. Texas also contested EPA's application of Good Neighbor obligations to areas not formally designated as nonattainment areas.

The Court's Analysis

Writing for the majority, Circuit Judge Higginson applied arbitrary and capricious review under the Administrative Procedure Act. The court rejected Texas's procedural arguments, holding that EPA's failure to meet the CAA's 12-month deadline did not render the disapproval void, and that EPA complied with procedures mandated by the CAA and APA in reviewing and disapproving the SIP.

On the substantive issues, the Fifth Circuit upheld EPA's interpretation of the Good Neighbor provision as reasonable. The court found that EPA was permitted to disapprove Texas's SIP based on the SIP's failure to demonstrate adequate compliance with statutory requirements. The court held that EPA's interpretation requiring Texas to evaluate potential impacts on areas currently measuring clean data but potentially struggling with maintenance was a reasonable construction of the statute. The court also validated EPA's application of Good Neighbor obligations to areas that did not meet national ambient air quality standards (NAAQS) even if they were not formally designated as nonattainment areas.

The court denied Texas's motion to strike CSAPR-related documents from the administrative record. Additionally, the court found that EPA rationally rejected Texas's SIP based on the SIP's failure to adequately demonstrate that Texas's ozone emissions did not interfere with maintenance of air quality standards in other states.

Dissent and Outcome

Circuit Judge Smith filed a dissenting opinion. The Fifth Circuit denied both the motion to strike and the petition for review, upholding EPA's disapproval of Texas's state implementation plan in its entirety.