Washington, DC and Pittsburgh, PA
Environmental Alert
(by Ben Clapp, Gary Steinbauer and Mackenzie Moyer)
On October 2, 2025, the Environmental Protection Agency (EPA) published a Proposed Rule and a companion Direct Final Rule to extend certain compliance deadlines for effluent limitations guidelines (ELGs) for the Steam-Electric Power Generating point source category in the Federal Register. 90 Fed. Reg. 47617; 90 Fed. Reg. 47693. EPA is “taking action to provide near-term compliance flexibility to coal-fired power plants by extending seven deadlines in the 2024 ELG rule and additional flexibilities for power generators to enhance the service life of critical energy infrastructure.” EPA states that the proposal seeks to advance the goals of the Trump administration’s Unleashing American Energy Executive Orders and provide reliable energy as demand increases due to the rise of AI and data centers.
Under the Clean Water Act (CWA), EPA is authorized to establish nationally applicable, technology-based ELGs for discharges from different categories of point sources. ELGs are based on technological feasibility, not water quality, and are based on the performance of specific treatment technologies, but do not require use of those specific control technologies.
In November 2015, EPA promulgated revisions to the steam-electric power generating point source category for the first time since 1982. The 2015 Rule set the first federal limitations on certain pollutants, such as toxic metals, discharged from a steam-electric power plant’s largest wastewater streams. As a result of legal challenges, EPA was required to reconsider certain limitations in the 2015 Rule. EPA reconsidered the ELGs for flue gas desulfurization (FGD) wastewater and bottom ash (BA) transport water and published a reconsideration rule in 2020 (the 2020 Rule). …