National Emission Standards for Hazardous Air Pollutants From Hazardous Waste Combustors: Residual Risk and Technology Review
Key claim: The EPA is finalizing that existing hazardous waste combustor emission standards adequately protect public health and adding new emission limits for hydrogen fluoride and hydrogen cyanide from major source incinerators, cement kilns, and boilers.
Abstract
(Rule · Environmental Protection Agency) The U.S. Environmental Protection Agency (EPA) is finalizing the residual risk and technology review (RTR) conducted for the National Emission Standards for Hazardous Air Pollutants (NESHAP) from Hazardous Waste Combustors (HWC). Specifically, the EPA is finalizing that risks due to emissions of hazardous air pollutants (HAP) from this source category are adequately addressed by the existing standards; that the NESHAP provides an ample margin of safety to protect public health; and that no developments in practices, processes, or control technologies necessitate revision of the standards. In addition, the EPA is promulgating emission standards for hydrogen fluoride (HF) and hydrogen cyanide (HCN) emissions from major source HWC incinerators, cement kilns, solid fuel boilers, and liquid fuel boilers under Clean Air Act (CAA) sections 112(d)(2) and (3) and 112(h). These final amendments also include work practice standards under CAA section 112(h) for periods of startup, shutdown, and malfunction (SSM); new electronic reporting provisions and requirements; provisions allowing States to choose to exempt area source HWCs from certain permitting requirements; and certain typographical and technical corrections and clarifications.
Why this matters
The HWC NESHAP RTR finalization confirms that existing hazardous waste combustion controls are deemed protective while incrementally tightening the pollutant list with HF and HCN limits — a meaningful compliance change for cement kilns, boilers, and commercial incinerators handling hazardous waste. It illustrates how EPA’s residual risk framework typically produces narrow additions rather than wholesale technology overhauls, with cost and permitting effects concentrated on a small set of major sources.