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On March 29, 2023, EPA published a proposed rule to potentially strengthen the Steam Electric Effluent Limitations Guidelines and Standards (ELGs) (40 CFR 423). EPA previously revised the Steam Electric ELGs in 2015 and 2020. The proposed  rule making would establish more stringent ELGs for wastestreams addressed in the 2020 Steam Electric Reconsideration Rule (flue gas desulfurization wastewater and bottom ash transport water). In addition, the proposal would establish more stringent effluent limitations and standards for an additional wastestream (combustion residual leachate) and takes comment on potential revisions to limitations and standards for a fourth wastestream (legacy wastewater). The first two wastestreams mentioned above are the subject of current litigation pending in the U.S. Court of Appeals for the Fourth Circuit. Appalachian Voices, et al. v. EPA, No. 20-2187 (4th Cir.). The 2015 limitations for combustion residual leachate and legacy wastewater discharged by existing sources were vacated by the U.S. Court of Appeals for the Fifth Circuit in Southwestern Electric Power Co., et al. v. EPA, 920 F.3d 999 (5th Cir. 2019).