S. 623 – No IRIS Act of 2025

AI-Generated Summary

Updated November 24, 2025 at 2:36 AM UTC

The No IRIS Act of 2025 would stop the Environmental Protection Agency from using health risk assessments produced by its Integrated Risk Information System program as a primary source of data in rulemaking, enforcement, permitting, and air‑toxics analysis. By prohibiting reliance on IRIS, the bill aims to change how the EPA bases certain regulatory decisions. The restriction applies to all EPA actions that would otherwise draw on IRIS assessments.

Key Provisions

Bars the EPA Administrator from using any Integrated Risk Information System (IRIS) assessment as a primary (tier‑1) data source when developing, finalizing, or issuing rules or regulations.
Prevents the EPA from relying on IRIS assessments for any regulatory, enforcement, or permitting actions.
Stops the EPA from using IRIS assessments to inform air‑toxics assessments, mapping, or screening tools.

Legislative Activity

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1 earlier action

SenateIntro Referral Latest Action

Read twice and referred to the Committee on Environment and Public Works.

Environment and Public Works Committee

February 18, 2025

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SenateIntro Referral

Introduced in Senate

February 18, 2025

SenateIntro Referral

Read twice and referred to the Committee on Environment and Public Works.

Environment and Public Works Committee

February 18, 2025

Bill Text

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Introduced in SenateIssued February 18, 2025

II

119th CONGRESS

1st Session

S. 623

IN THE SENATE OF THE UNITED STATES

February 18, 2025

Mr. Kennedy introduced the following bill; which was read twice and referred to the Committee on Environment and Public Works

A BILL

To prohibit the Environmental Protection Agency from using assessments generated by the Integrated Risk Information System as a tier 1 data source in rulemakings and other regulatory, enforcement, or permitting actions, and for other purposes.

1.

Short title

This Act may be cited as the No IRIS Act of 2025.

2.

Prohibition on use of assessments generated by the Integrated Risk Information System program

Notwithstanding any other provision of law, the Administrator of the Environmental Protection Agency may not use any assessment generated by the Integrated Risk Information System program of the Environmental Protection Agency as a basis—

(1)

to develop, finalize, or issue a rule or regulation;

(2)

to carry out any other regulatory, enforcement, or permitting action; or

(3)

to inform air toxics assessments or other mapping or screening tools.