Data / Federal rules / 2025-19815

National Emission Standards for Hazardous Air Pollutants From Hazardous Waste Combustors: Residual Risk and Technology Review; Withdrawal of Proposed Revisions to Standards for Periods of Malfunction

The Environmental Protection Agency published this proposed rule in the Federal Register on November 10, 2025. Comments closed on December 26, 2025.

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What the agency says

This proposal presents the results of the U.S. Environmental Protection Agency's (EPA) residual risk and technology review for the National Emission Standards for Hazardous Air Pollutants (NESHAP) from Hazardous Waste Combustors (HWC) as required under the Clean Air Act (CAA). In this action, the EPA is proposing to establish emission limits and work practice standards for hydrogen fluoride and hydrogen cyanide emissions from HWC incinerators, cement kilns, solid fuel boilers, and liquid fuel boilers; eliminate the startup, shutdown, and malfunction (SSM) exemption; add a work practice standard for periods of SSM; add electronic reporting procedures and requirements; allow states to choose to exempt area sources from certain permitting requirements; and other clarifications and corrections. In response to comments received on certain aspects of the July 24, 2024, proposed revisions for periods of malfunction, the EPA is withdrawing that proposed rule and instead proposing different provisions to address periods of SSM.

Key facts

Document number: 2025-19815
Type: Proposed rule
Action: Proposed rule and withdrawal of proposed rule
Agency: Environmental Protection Agency
Published: November 10, 2025
Comments due: December 26, 2025
Dates: Comments. Comments must be received on or before December 26, 2025. As of November 10, 2025, the proposed rule published on July 24, 2024, at 89 FR 59867, is withdrawn. Under the Paperwork Reduction Act (PRA), comments on the information collection provisions are best assured of consideration if the Office of Management and Budget (OMB) receives a copy of your comments on or before December 10, 2025.
Docket: EPA-HQ-OAR-2004-0022; FRL-10654-01-OAR
Regulation ID (RIN): 2060-AV96
Code of Federal Regulations: 40 CFR 63
Topics: Air pollution control; Environmental protection; Hazardous substances; Reporting and recordkeeping requirements
Significant: Yes, under Executive Order 12866
Pages: 42

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on environmental protection · Rules on hazardous substances · Published in November 2025

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