The “Zone of Reasonableness”

By Andre Bellefontaine, Josiah Kollmeyer, Victor Suane & Richard Pabst 

A pair of recent decisions from the US Supreme Court and the Fifth Circuit Court of Appeals signals a trend by the judiciary to closely scrutinize agency rulings where, in the past, courts have traditionally maintained a laissez-faire approach.

In Ohio v. EPA, the Supreme Court ruled that an agency action qualifies as arbitrary or capricious if it is not “reasonable and reasonably explained”.[1] The decision was 5-4, with Justice Gorsuch writing for the majority and Justice Barrett writing the dissent. In the dissent, Justice Barrett explained that the Court did not conclude that the EPA’s actions were substantively unreasonable. Rather, the primary basis for the Court’s decision is the argument that EPA failed to provide a “satisfactory explanation for its action” and a “reasoned response” to comments. Justice Barrett noted that the Court should, as it has most often done in the past, “uphold a decision of less than ideal clarity if the agency’s path may reasonably be discerned.”[2] Thus, under Justice Barrett’s view, a reasonable result can save a poorly-explained decision from an Administrative Procedure Act challenge; Justice Gorsuch and the majority rejected this conclusion.

Likewise, a day prior to the Supreme Court’s ruling in Ohio v. EPA, the Fifth Circuit issued its opinion in National Association of Manufacturers v. SEC and held that the SEC had acted arbitrarily and capriciously in two ways: 1) the agency failed to adequately explain its decision to disregard its prior factual finding; and 2) the agency failed to provide a reasonable explanation regarding the significance of certain risks at issue in the matter.[3] The panel’s criticism focused on the agency’s rationale and its decision-making process, rather than the final resulting rule.

In each of the decisions, the courts cite FCC v. Prometheus Radio Project,[4] which had reformulated the arbitrary and capricious inquiry. In that case the Supreme Court ruled that “[a] court simply ensures that the agency has acted within a zone of reasonableness, and in particular, has reasonably considered the relevant issues and reasonably explained the decision.”[5] Per this language, the agency’s decision-making process, along with its final determination, will be scrutinized by the courts if a rulemaking is challenged.

Thus, it appears the “zone of reasonableness” test has usurped previous iterations of the arbitrary and capricious analysis. Combined with the overturning of Chevron deference also announced by the Court last year,[6] the likely overall effect of this new precedent will be greater scrutiny over agency action and a more restricted scope for permissible agency action.

[1] Ohio v. Env’t Prot. Agency, 603 U.S. 279, 292 (2024) (quoting FCC v. Prometheus Radio Project, 592 U.S. 414, 423 (2021)).

[2] Id. at 311 (Barrett, J., dissenting) (quoting Motor Vehicle Mfrs. Ass’n of U.S., Inc. v. State Farm Mut. Auto. Ins. Co., 463 U.S. 29, 43 (1983)).

[3] Nat’l Ass’n of Manufacturers v. United States Sec. & Exch. Comm’n, 105 F.4th 802, 811 (5th Cir. 2024).

[4] Fed. Commc’ns Comm’n v. Prometheus Radio Project, 592 U.S. 414 (2021).

[5] Id. at 423.

[6] See Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024).

Kean Miller LLP

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