No IRIS Act of 2025 would bar the Environmental Protection Agency (EPA) from using any assessments generated by the Integrated Risk Information System (IRIS) as a basis for developing, finalizing, or issuing rules; for carrying out regulatory, enforcement, or permitting actions; or for informing air toxics assessments and other mapping or screening tools. In effect, IRIS hazard assessments—long used by EPA as a primary reference for chemical hazards and risk values—could no longer serve as a tier 1 data source in regulatory decision‑making. If enacted, the bill would push EPA to rely on alternative data sources or risk assessment processes, potentially altering the speed, manner, and stringency of regulatory actions related to chemical risks.
Key Points
- 1Prohibits the EPA from using any IRIS assessments as a basis to develop, finalize, or issue rules or regulations.
- 2Prohibits the EPA from using IRIS assessments for any regulatory, enforcement, or permitting action.
- 3Prohibits using IRIS assessments to inform air toxics assessments or other mapping or screening tools.
- 4The prohibition applies “notwithstanding any other provision of law,” giving it broad, overriding effect over existing statutes or regulatory practices.
- 5Short title designated as the “No IRIS Act of 2025.”