Washington, DC
Legal Intelligencer
(by Varun Shekhar)
The U.S. Environmental Protection Agency (EPA) has finalized rulemaking originally proposed in 2016 to remove “emergency” affirmative defense provisions from its Clean Air Act (CAA) permitting regulations for “major sources”. On July 21, 2023, EPA published a Final Rule amending 40 C.F.R. §§ 70.6 and 71.6 to delete the emergency affirmative defense provisions in light of decisions from the U.S. Court of Appeals for the DC Circuit.
The emergency affirmative defense provision under 40 C.F.R. Parts 70 and 71 originated from rulemaking promulgated by EPA in 1992. This rulemaking was intended to implement the 1990 amendments to the CAA which established Title V, including requirements for operating permitting programs as applicable to among other things, “major sources”. The CAA defines a major source as “any stationary facility or source of air pollutants which directly emits, or has the potential to emit, one hundred tons per year or more of any air pollutant…”. In addition, the CAA also includes as major sources those “that emit[] or ha[ve] the potential to emit considering controls, in the aggregate, 10 tons per year or more of any hazardous air pollutant or 25 tons per year or more of any combination of hazardous air pollutants.”
As part of the 1992 rulemaking, EPA included at 40 C.F.R. §§ 70.6(g) (for state operating permitting programs) and 71.6(g) (for federal operating permitting programs) provisions allowing for an operator to assert an affirmative defense for any unavoidable noncompliance with technology-based emission limits in the event of “any situation arising from sudden and reasonably unforeseeable events beyond the control of the source, including acts of God, which situation requires immediate corrective action to restore normal operation…”. These provisions also required the operator to keep contemporaneous operating logs or other evidence documenting the occurrence of the emergency event, that the facility was at the time of the event being properly operating, that it took all reasonable steps to minimize emissions, and that notice of the emergency was submitted to the applicable permitting authority within two business days of the exceedance of the emission limit. …