No IRIS Act of 2025
- Sponsor
- Sen. Kennedy, John [R-LA]
- Committees
- Environment and Public Works Committee (primary)
- Last action
- Feb 18, 2025
Bottom line
The bill aims to restrict the EPA's use of a key scientific assessment program for environmental regulations, potentially impacting how chemical risks are evaluated and managed across the country.
What it actually does
This bill prohibits the Environmental Protection Agency (EPA) from using any assessment generated by its Integrated Risk Information System (IRIS) program as a basis for developing regulations, carrying out enforcement or permitting actions, or informing air toxics assessments and other screening tools. Essentially, it removes IRIS as a foundational scientific data source for EPA's regulatory activities.
Proponents argue
Supporters argue that IRIS assessments are often delayed, inconsistent, and based on flawed methodologies, leading to overly conservative or unreliable risk values that hinder economic activity and regulatory certainty. They contend that this prohibition would force the EPA to use more robust, timely, and transparent scientific methods for risk assessment, or to rely on other available data sources, ultimately benefiting industry and streamlining regulatory processes.
Opponents contend
Opponents contend that IRIS provides crucial, peer-reviewed scientific data for understanding chemical hazards and protecting public health and the environment. They argue that prohibiting its use would severely weaken EPA's ability to regulate harmful substances, potentially increasing public exposure to risks, undermining evidence-based policymaking, and creating a scientific vacuum in federal chemical risk assessment.
The bill text is extremely short and easy to read, but its policy implications are substantial and require significant background knowledge to fully grasp.
Section 2
Prohibition on Use of Integrated Risk Information System Assessments
This section explicitly forbids the Administrator of the Environmental Protection Agency (EPA) from using any assessment generated by the agency's Integrated Risk Information System (IRIS) program. This prohibition applies to developing, finalizing, or issuing rules or regulations, carrying out any other regulatory, enforcement, or permitting actions, and informing air toxics assessments or other mapping and screening tools. It effectively removes IRIS as a permissible scientific basis for a wide range of EPA's core functions.
Supporters argue
Supporters argue that this prohibition is necessary because IRIS assessments are often outdated, lack transparency, and use overly cautious assumptions, leading to regulations that are economically burdensome without clear scientific justification. They contend that this would force the EPA to use more robust, timely, and transparent scientific methods for risk assessment, or to rely on other available data sources that are more aligned with current scientific understanding and industry practices.
Critics contend
Opponents argue that IRIS provides a critical, peer-reviewed scientific foundation for EPA's efforts to identify and characterize the health hazards of chemicals. They assert that removing IRIS assessments would severely cripple the EPA's ability to protect public health and the environment from toxic substances, forcing reliance on less comprehensive or less protective data, or creating regulatory paralysis due to a lack of a standardized scientific basis.
Tradeoffs
The bill creates a tension between the desire for regulatory certainty and reduced burden on industry, and the need for comprehensive, standardized scientific assessment to protect public health and the environment. It also highlights the ongoing debate about the scientific rigor, transparency, and utility of the IRIS program itself, and the appropriate role of Congress in dictating agency scientific methodologies.