EPA approved revisions to the Navajo Nation's primacy program under the SDWA that adopted regulations effectuating the federal Stage 2 Disinfectants and Disinfection Byproducts Rule and the Ground Water Rule.

EPA approved revisions to Guam's primacy program under the SDWA that adopted regulations effectuating the federal Revised Total Coliform Rule.

EPA supplemented proposed revisions to Louisiana's Underground Injection Control (UIC) Program to approve a revision to the state's SDWA §1422 UIC program to include Class VI injection well primary enforcement responsibility.

EPA approved revisions to Nevada's state primacy program under the SDWA that adopted regulations effectuating the Federal Stage 1 Disinfectants and Disinfection Byproducts Rule.

EPA approved revisions to Ohio’s Public Water System Supervision Program under the SDWA.

EPA gave notice that Connecticut revised its approved Public Water System Supervision program to meet the requirements of the SDWA.

United States v. Suffolk, County of, No. 23-CV-4369 (E.D.N.Y. June 14, 2023). Settling SDWA defendants must close prohibited large capacity cesspools and motor vehicle waste disposal wells in accordance with a specified timetable in connection with violations of relevant regulations.

EPA proposed to approve revisions to Louisiana's Underground Injection Control Program that would allow permits for and ensure compliance of geologic carbon sequestration facilities as Class VI wells for primacy under the SDWA.

EPA proposed a national primary drinking water regulation and health-based maximum contaminant level goals for perfluorohexane sulfonic acid (PFHxS), hexafluoropropylene oxide dimer acid (HFPO-DA) and its ammonium salt (also known as a GenX chemicals), perfluorononanoic acid (PFNA), and perfluorobutane sulfonic acid (PFBS), and their mixtures, as well as for perfluorooctanoic acid and perfluorooctane sulfonic acid under the SDWA.

EPA approved revisions to Nevada's state primacy program under the SDWA that adopted regulations that effectuate the federal Radionuclides Rule.