Supreme Court Limits Environmental Reviews for Infrastructure Projects

The Supreme Court of the United States ruled 8-0 on May 29, 2025, in Seven County Infrastructure Coalition v. Eagle County, Colorado, significantly narrowing the scope of environmental reviews required under the National Environmental Policy Act (NEPA). The decision reversed a D.C. Circuit ruling that had blocked an 88-mile rail line in Utah's Uinta Basin because the U.S. Surface Transportation Board failed to analyze indirect effects, such as upstream oil drilling and downstream refining in Texas and Louisiana.

Writing for the majority, Justice Brett Kavanaugh established that federal agencies are not required to evaluate indirect effects of related projects over which they lack regulatory jurisdiction. He argued that NEPA is a procedural cross-check rather than a substantive roadblock and mandated that courts grant substantial deference to agency assessments. The Court further noted that brevity in Environmental Impact Statements is a virtue, aligning the ruling with the 2023 BUILDER Act's limits on page counts.

While the judgment was unanimous, Justice Sonia Sotomayor and other liberal justices concurred on narrower grounds, arguing that the Surface Transportation Board simply lacked the legal authority to reject the project based on impacts it did not regulate. Environmental groups, including Earthjustice and the Center for Biological Diversity, criticized the ruling for allowing agencies to ignore foreseeable harms. Conversely, infrastructure proponents hailed the decision as a necessary correction to prevent NEPA from being used to stall development.