On February 18, 2026, the United States Environmental Protection Agency (EPA) published an Advanced Notice of Proposed Rulemaking (ANPRM) to solicit stakeholder input on potential revisions to its March 2024 final rule establishing hazardous substance Facility Response Plan (FRP) requirements under the Clean Water Act (CWA). The 2024 rule, codified at 40 CFR Part 118, requires certain non-transportation-related onshore facilities that store hazardous substances above specified threshold quantities and are located near navigable waters to develop and implement response plans for worst-case discharge scenarios. In this ANPRM, EPA is reconsidering key aspects of the rule, including the methodology for determining applicability (such as the use of 1,000 times the Reportable Quantity threshold), the absence of de minimis container size or concentration exemptions, proximity-to-water calculations, substantial harm criteria, and planning distance assumptions. The Agency is also evaluating whether revisions could better align the rule with existing programs, including oil spill prevention requirements under 40 CFR Part 112 and the Risk Management Program under 40 CFR Part 68, while reducing unnecessary compliance burdens without compromising environmental protection. Comments are invited through March 20, 2026.