Trump EPA Rolls Back Biden-Era Rules on Cancer-Causing Chemical in Medical Sterilization

The Trump administration moved Friday to roll back Biden-era limits on emissions of ethylene oxide, a cancer-causing chemical widely used in the sterilization of medical equipment, sparking immediate criticism from environmental groups and raising questions about the balance between public health and industrial costs. The Environmental Protection Agency (EPA) argues the change will “safeguard the supply of essential medical equipment” and save companies approximately $630 million over 20 years, but critics contend the move prioritizes industry profits over community health.

The Calculus Behind the Reversal

At the heart of the decision lies a disagreement over the acceptable level of risk associated with ethylene oxide exposure. The EPA, under Administrator Lee Zeldin, asserts that the stricter regulations implemented by the Biden administration in 2024 were overly burdensome and threatened the availability of sterilized medical devices. These devices, crucial for preventing infections, are often sterilized using ethylene oxide because they cannot withstand the higher temperatures of steam sterilization or the penetrating power of radiation. Approximately 50% of sterile medical devices in the U.S. Rely on this method, according to the EPA.

However, environmental and public health advocates reject this framing. They argue that existing technologies allow facilities to comply with the more stringent rules without disrupting the supply of medical equipment. Irena Como, senior attorney at the Southern Environmental Law Center, stated Friday that the repealed rule “was an important and overdue step to reduce toxic ethylene oxide pollution and protect communities,” and that reversing it will “subject even more people…to harm that is entirely preventable.” A lawsuit challenging presidential exemptions granted to certain facilities on EtO emissions is already underway, filed in January by the Southern Environmental Law Center and the Natural Resources Defense Council. The complaint alleges that viable technologies exist for compliance without significant cost increases.

Ethylene Oxide: A Known Carcinogen

Ethylene oxide is a colorless gas used not only in medical sterilization but as well in the production of antifreeze, detergents, plastics, and adhesives. Exposure to the chemical carries significant health risks. Short-term inhalation can cause headaches, dizziness, nausea, and respiratory irritation. More concerning are the long-term effects: increased risk of cancers of the white blood cells, including non-Hodgkin’s lymphoma, and breast cancer. The EPA itself previously acknowledged the carcinogenic nature of ethylene oxide, stating on a now-deleted page of its website that “EtO is a human carcinogen. It causes cancer in humans.”

The Biden administration’s 2024 rules were a direct response to growing concerns about these health risks, particularly in communities near sterilization facilities. The changes sought a 90% reduction in ethylene oxide emissions from commercial sterilizers, with a focus on protecting vulnerable populations in areas like Louisiana’s “Cancer Alley.” The tighter rules were informed by an EPA scientific study that found ethylene oxide to be 60 times more carcinogenic than previously understood, a finding the Trump EPA now says warrants reassessment.

A Pattern of Deregulation

This rollback is not an isolated incident. The Trump administration has consistently pursued a policy of reducing regulations perceived as burdensome to industry. Recent examples include easing limits on emissions from coal power plants, as reported in February 2026, and repealing the “endangerment finding” – a key justification for regulating greenhouse gas emissions from vehicles. The rollback of coal plant emission standards and the repeal of the endangerment finding signal a broader shift in the EPA’s approach to environmental protection.

Impact on Sterilization Facilities and Communities

Approximately 90 commercial sterilization facilities across the United States will be affected by the proposed rule change, with roughly a dozen located in California. Three companies in California – Sterigenics facilities in Ontario and Vernon – previously received presidential exemptions for their ethylene oxide emissions in July. Sterigenics operates many of these facilities and provides sterilization technology for a wide range of products. The American Chemistry Council has voiced support for the EPA’s proposal, arguing that the previous regulations threatened access to vital medical products.

The EPA’s proposal offers facilities a choice: install continuous real-time monitoring systems for ethylene oxide emissions or comply with modified pollution control requirements if they emit more than 10 tons of the chemical annually. This approach aims to balance environmental concerns with the need to maintain a reliable supply of sterilized medical equipment.

The Role of Presidential Exemptions

The granting of presidential exemptions to specific facilities raises questions about the transparency and fairness of the regulatory process. These exemptions, awarded to Sterigenics facilities in July, allowed them to exceed emission limits, ostensibly to avoid disruptions in medical supply chains. However, critics argue that these exemptions were granted without adequate public input or consideration of the health risks to nearby communities.

What’s Confirmed and What Remains Unclear

Confirmed: The Trump EPA has proposed rolling back Biden-era limits on ethylene oxide emissions. The EPA cites cost savings for companies and the need to ensure a stable supply of sterilized medical equipment as justification. The rollback affects approximately 90 facilities nationwide. Presidential exemptions were granted to three California facilities operated by Sterigenics.

Unclear: The long-term health impacts of the rollback are yet to be determined. The extent to which facilities will utilize the proposed monitoring systems versus modified pollution controls remains to be seen. The outcome of the ongoing lawsuit challenging the presidential exemptions is uncertain. The EPA’s reassessment of the carcinogenic risk of ethylene oxide could lead to further changes in regulations.

Next Steps: A Procedural Outlook

The EPA will now open a 45-day public comment period following the publication of the proposal in the Federal Register. This period allows stakeholders – including environmental groups, industry representatives, and concerned citizens – to submit their feedback on the proposed rule change. Following the comment period, the EPA will review the submissions and make a final decision, which is expected sometime this year. Any final rule is likely to face legal challenges, potentially prolonging the uncertainty surrounding ethylene oxide emissions standards. The agency’s decision will likely be scrutinized not only for its environmental impact but also for its implications for the broader debate over regulatory oversight and the balance between economic growth and public health.