EPA Eases Up on Sterilization Gas: EtO Rules Get Remix
Published Date: 3/17/2026
Proposed Rule
Summary
The EPA is proposing changes to rules for sterilization facilities that use ethylene oxide, a chemical that can be harmful if not controlled. They want to remove some strict risk-based limits, fix technical mistakes, and update how facilities prove they’re following the rules. If you run or work with these facilities, get ready for new deadlines and clearer standards by mid-2026, which could affect how you manage emissions and compliance costs.
Analyzed Economic Effects
4 provisions identified: 4 benefits, 0 costs, 0 mixed.
Rescinding 112(f)(2) Risk Standards
If you run a commercial sterilization facility that uses ethylene oxide (EtO), EPA proposes to rescind the risk-based standards it added under Clean Air Act section 112(f)(2) in the 2024 Final Rule. EPA says this would return the source category to the regulatory framework under CAA section 112(d). Comments on this proposed rule must be submitted by May 1, 2026.
Single ARV Standard at 99.6% Reduction
If your facility uses at least 10 tons per year (tpy) of EtO, EPA proposes to set the emission standard for new aeration room vents (ARVs) at 99.6 percent reduction, making the same standard apply to new and existing ARVs. EPA states this change would allow facilities to share infrastructure and streamline operations.
More Flexibility for Compliance Monitoring
EPA proposes to amend compliance demonstration rules so affected facilities may choose between annual performance testing with parametric monitoring or operating a continuous emission monitoring system (CEMS). This gives facilities an option in how they demonstrate ongoing compliance.
Removing PTE Capture Requirement
EPA proposes to rescind the requirement that facilities use a permanent total enclosure (PTE) to ensure complete capture of EtO emissions. This change would apply to the Commercial Sterilization Facilities NESHAP and related affected sources.
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Key Dates
Department and Agencies
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