BLUF: The Federal Highway Administration, Federal Railroad Administration, and Federal Transit Administration finalized a rule on September 1, 2026 rewriting their National Environmental Policy Act (NEPA) implementing regulations, effective the same day.

The three Department of Transportation operating administrations finalized an interim final rule first published July 3, 2025, addressing public comments received during a 30-day comment period and making minor technical changes. The rule updates the agencies' NEPA regulations to reflect the removal of governmentwide Council on Environmental Quality (CEQ) NEPA regulations, changes from the BUILDER Act provisions of the Fiscal Responsibility Act of 2023, environmental-review provisions in the Infrastructure Investment and Jobs Act (IIJA) of 2021, and the Supreme Court's decision in Seven County Infrastructure Coalition.

Why it matters: Environmental-review timelines and documentation requirements directly affect schedule and cost risk on federally funded highway, rail, and transit projects. With the rule now final rather than interim, contractors and consultants providing NEPA compliance, environmental impact statement preparation, and permitting support have a settled regulatory baseline to plan against rather than an interim framework subject to further revision.

By the numbers:

• Effective date: September 1, 2026
• Original interim final rule published: July 3, 2025
• Public comment period: 30 days
• Docket number: FHWA-2025-0007
• RINs: 2125-AF80 (FHWA), 2130-AD05 (FRA), 2132-AB51 (FTA)

The rule addresses public comments received on the interim final rule and finalizes it largely as proposed, with only minor technical changes noted in the final text.

Source: Federal Register