On April 12, 2019, the Fifth Circuit issued its opinion in Southwestern Elec. Power Co. v. EPA, ordering EPA to reconsider parts of its 2015 Effluents Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category (“2015 ELG Rule”). The opinion resolves a challenge brought by environmental groups regarding the rule’s effluent limitation guidelines for “legacy” wastewater and for combustion residual leachate from landfills or settling ponds.

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