Docket 23-1067
Oklahoma v. EPA
DecidedJun 18, 2025
6-2decision
Source: CourtListener.
Court rules states can challenge EPA air-quality plan rejections in regional courts, not D.C.
Impact5/10
What it does
The Court held that each EPA rejection of a state's air-quality plan (called a State Implementation Plan, or SIP) is its own separate legal "action" tied to that specific state, not part of a single nationwide action just because EPA bundled multiple rejections into one rule. Because each rejection applies only to the state whose plan was denied, challenges to those rejections must be filed in the regional circuit court for that state, not in the D.C. Circuit. The Court also held that EPA's use of a common analytical framework across states does not transform these state-specific decisions into a nationally applicable action.
Who benefits
States and energy companies whose state air-quality plans were rejected by EPA, who can now challenge those rejections in regional circuit courts rather than being required to litigate in the D.C. Circuit.
Who is affected
EPA, which loses its ability to consolidate legal challenges to its state plan rejections in the D.C. Circuit by packaging multiple state-specific decisions into a single omnibus rule.
Practical impact
States and companies challenging EPA's rejection of their air-quality plans under the Clean Air Act's Good Neighbor provision can now pursue those challenges in the regional circuit court for their state, which may be more favorable or convenient than the D.C. Circuit. EPA can no longer guarantee D.C. Circuit review — and the legal advantages that may come with it — simply by bundling multiple state-specific decisions into one omnibus rule. The ruling also means that courts in different regions may reach different conclusions about similar EPA rejections, since the cases are now spread across multiple circuits.
Majority — Thomas
Joined by: Sotomayor, Kagan, Kavanaugh, Barrett, Jackson
The majority held that the relevant "action" for venue purposes is defined by the underlying Clean Air Act provision EPA used, not by how EPA chose to package its decisions in the Federal Register. Because the Clean Air Act treats each state's implementation plan approval or disapproval as a separate, state-specific action, each EPA rejection of a state plan is its own distinct action — and since a state plan by definition applies only to one state, that action is "locally or regionally applicable." The Court further reasoned that EPA's use of a uniform four-step analytical framework across all 21 states goes to EPA's reasoning process, not to the geographic scope of each individual decision, and therefore cannot make a state-specific rejection into a nationally applicable action. The Court then examined whether the "nationwide scope or effect" exception applied — which would send the case to D.C. even for locally applicable actions — and found it did not, because EPA's disapprovals were driven primarily by intensely fact-specific, state-by-state analysis rather than by any single nationwide determination. The majority distinguished this case from a companion case (Calumet) where a nationwide determination was the primary driver of EPA's decisions, noting that here no single nationwide factor resolved EPA's ultimate conclusions about Oklahoma and Utah.
Dissent reasoning
Justice Gorsuch, joined by Chief Justice Roberts, agreed with the Court's bottom-line conclusion that the proper venue is a regional circuit, not the D.C. Circuit. However, they could not join the majority's reasoning, instead relying on the analytical path they described in their separate opinion in the companion case, EPA v. Calumet Shreveport Refining. Because they reached the same result by a different route, they concurred in the judgment only.
Constitutional question
Under the Clean Air Act's venue provision, must challenges to EPA's rejection of individual state air-quality plans be filed in the D.C. Circuit Court, or may they be filed in regional circuit courts closer to the affected states?
Precedent changed
The ruling applies and extends the framework established in the companion case EPA v. Calumet Shreveport Refining, L.L.C., 605 U.S. 627 (2025), decided the same day, to the context of state implementation plan disapprovals.