EPA's toxicology database blocked from pollution rules
S. 623 — No IRIS Act of 2025 · Filed by John Kennedy (R-LA) · 3 cosponsors · Introduced Feb 18, 2025 · Referred to committee
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What it does
This bill prohibits the EPA from using assessments from its Integrated Risk Information System (IRIS) program as a basis for developing environmental regulations, enforcement actions, or permitting decisions. IRIS is the EPA's primary scientific database for assessing health risks from chemical exposure; blocking its use would prevent the agency from relying on its own toxicological research to justify pollution controls, emissions limits, or cleanup requirements.
Why we flagged it
The bill functions as a targeted deregulation mechanism by disabling the EPA's primary scientific assessment tool. Rather than openly repealing environmental rules, it prevents the agency from using its own risk research to justify new or existing protections—a structural approach to blocking health-based regulation.
What the text implies
- IRIS assessments underpin not only new EPA rules but also existing regulations and enforcement actions; blocking IRIS use may create legal vulnerability for current pollution controls, potentially opening them to challenge or rescission.
- The bill does not prohibit EPA from using OTHER data sources (industry studies, peer-reviewed literature, international assessments); however, IRIS is the agency's integrated, peer-reviewed, publicly transparent database—replacing it with alternative sources may reduce scientific rigor and public scrutiny.
The full analysis lists 5 implications of this text.
Who stands to gain
chemical manufacturers; petroleum refineries; industrial polluters subject to EPA air toxics and water quality standards