After a few decades of uncertainty and “it’s-alive-it’s-dead-it’s-alive” swings, EPA’s “once in, always in” (OI/AI) policy is once again dead. And this time, it seems very dead.

On June 20, 2025, President Trump signed a Congressional Review Act (CRA) resolution that rejects a September 2024 rule adopted by the Biden EPA that had revived a…