The U.S. Environmental Protection Agency (EPA) is evaluating whether to propose revisions to the microbial and disinfection byproducts (MDBP) rules, as authorized under the Safe Drinking Water Act (SDWA), to further improve public health protection from MDBPs in drinking water or to reduce the regulatory burden while maintaining or improving public health protection. In May 2022, the EPA initiated a working group under the National Drinking Water Advisory Council on potential MDBP rule revisions. The NDWAC provided their recommendations to the EPA in December of 2023. The EPA is considering the NDWAC’s recommendations as the agency develops the proposed rule revisions.