The rapid changes relating to NEPA-implementing regulations accelerated this week, as the White House Council on Environmental Quality (CEQ) published an interim final rule (IFR) removing its NEPA regulations from the Code of Federal Regulations.

Effective April 11, 2025, CEQ's IFR removes all iterations of its NEPA regulations, including 40 CFR parts 1500, 1501, 1502, 1503, 1504, 1505, 1506, 1507, and 1508, which federal agencies and developers alike have relied on in permitting projects since the 1970s.

This seismic shift in the implementation of NEPA—an area of the law that remained relatively stable for nearly a half century—comes on the heels of the D.C. Circuit Court of Appeal’s denial of the requests (by both petitioners and respondents) for rehearing en banc of that court’s opinion in Marin Audubon.

As we described in our November 2024 client alert, the panel majority in Marin Audubon concluded that the CEQ lacks authority to issue binding NEPA regulations. The D.C. Circuit declined to review the panel’s opinion, but, in a concurring opinion, seven out of 12 D.C. Circuit judges described the discussion regarding CEQ’s regulatory authority as dicta.

The IFR also follows on other important judicial developments. In early February 2025, the District Court for the District of North Dakota, in Iowa v. Council on Environmental Quality, issued an opinion in which it vacated the Biden Administration’s 2024 Phase 2 NEPA rules.

The court explained that its judgment would revert the CEQ regulations to an earlier version, namely, the version promulgated by the first Trump administration in 2020 as amended by the Biden administration’s 2021 Phase 1 NEPA rules. Although the court did not finally resolve the issue, it further opined that “it is very likely that if the CEQ has no authority to promulgate the 2024 Rule, it had no authority for the 2020 Rule or the 1978 Rule and the last valid guidelines from CEQ were those set out under President Nixon.”

Citing these decisions and President Trump’s Executive Order (EO) 14154, Unleashing American Energy—which revoked President Carter’s EO 11991 that served as the basis for CEQ’s NEPA regulations—the IFR has now made it clear that CEQ’s NEPA regulations will be rescinded in full.

What does this mean for your project?

In conjunction with its IFR, CEQ released a memo to the heads of federal departments and agencies directing them to:

1. Revise or establish new NEPA regulations within the next year consistent with EO 14154
2. Not delay pending NEPA analyses while those NEPA procedures are being updated
3. Most importantly, “consider voluntarily relying on [the soon-to-be-rescinded] regulations in completing ongoing NEPA reviews or defending against challenges to reviews completed while those regulations were in effect.”

CEQ also encouraged agencies to use the 2020 NEPA regulations as an “initial framework” for developing revisions to their own NEPA regulations, and provided suggested guidelines for those regulations.

As the implications for project proponents and litigants unfold, we are closely monitoring not only the enforceability of CEQ’s rescinded regulations, but also the agency-specific procedures that will replace them.

Clear rules foster timely and cost-efficient environmental reviews. Project proponents should consider active participation in the rulemakings that we will see across multiple federal agencies over the next 12 months to ensure adoption of legally defensible NEPA-implementing regulations that streamline and accelerate the permitting process.