Ethylene Oxide Exposure

Ethylene oxide is a gas used to sterilize medical devices and make other chemicals. The National Cancer Institute reports that certain cancers, especially lymphoma and leukemia, have been associated with workplace exposure. Federal rules for sterilizer emissions have changed and are being reconsidered. Living or working near a facility does not by itself show a harmful dose or prove that EtO caused an illness. An ethylene oxide lawyer looks at the facility, the exposure history and the medical evidence.

What ethylene oxide is

Ethylene oxide, or EtO, is a flammable, colorless gas with a sweet odor. It is used mainly to make other chemicals, such as antifreeze, and in smaller amounts as a pesticide and a sterilizing agent1. EPA says EtO is used to sterilize about 20 billion medical devices a year, roughly half of all U.S. medical devices2. Its ability to damage DNA is what makes it an effective sterilant and also what accounts for its cancer-causing activity1.

Ethylene oxide is a different chemical from ethylene glycol, the main ingredient in many antifreezes, even though EtO is used to make it.

How people are exposed

People are exposed mainly by breathing it in, and less often by swallowing it, at work, from consumer products or from the environment1. Workers and people who live near facilities that make or use EtO may be exposed through uncontrolled emissions1. Exposure contexts include:

• Workers at commercial sterilization facilities
• Workers in chemical plants that make or use EtO
• Hospital workers who run on-site sterilizers
• People who live near emitting facilities

For workers, OSHA's limit is 1 part per million averaged over 8 hours, with a 5 ppm limit over any 15-minute period3.

What the health research shows

The National Cancer Institute says lymphoma and leukemia are the cancers most frequently reported in association with occupational EtO exposure, and that stomach and breast cancers may also be associated1. NCI cites a 2023 cohort study that examined residential EtO emissions in relation to breast cancer and non-Hodgkin lymphoma4.

Where federal regulation stands

EPA commercial sterilizer rules

1. April 5, 2024

   EPA publishes a final rule tightening emission standards for commercial sterilizers5.

2. March 12, 2025

   EPA announces it is reconsidering the 2024 rule5.

3. March 17, 2026

   EPA proposes amendments that would rescind the risk-based standards and other provisions5.

4. Nov. 10, 2026

   The proposal is not final; EPA's page describes it as a proposal2.

A proposed rule is not in effect until finalized. We recheck status before relying on it.

Why ethylene oxide lawsuits are filed

Claims generally allege that a facility released EtO in ways that exposed workers or neighbors, or that a company failed to warn about the risks. State courts have heard many of these cases, which often involve a specific facility. A claim depends on the facility, the years of operation and emissions, the person's exposure history and the diagnosis.

Who may have a claim

• Where you lived or worked, and the dates
• Distance from a sterilizer or chemical plant
• Job duties and any exposure monitoring
• The diagnosis, date and pathology
• Other risk factors your doctors noted

Who may be responsible

• Facility owners and operators
• Parent companies, in some cases
• Suppliers, depending on the claim

Filing deadlines for ethylene oxide claims

Exposure claims often use discovery rules that start the clock when the illness and its likely cause were or should have been known. Examples:

• Arizona: generally two years for personal injury and wrongful death6.
• California: two years for personal injury7, and for toxic exposure, two years from the injury or from when the person knew or should have known of the injury and its likely cause, whichever is later8.
• New York: three years, measured from discovery of the injury for the latent effects of exposure to a substance9.
• Texas: two years for personal injury10; the 15-year product limit has an exception for some latent diseases from exposure11.

These examples are not complete, and other rules can apply. A product liability attorney can check the rules for your state early.

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Records that help

Records that can help

Exposure history

• Where you lived and worked, with dates
• Job titles, duties and employers
• Product names or labels, if known
• Facility names near home or work

Medical

• Diagnosis date and pathology reports
• Treating doctors and hospitals
• Family medical history, if known

Other

• Water bills or water system notices
• Union, military or training records

What happens after you contact CBW Law

How an EtO exposure review works

1. You tell us your history

   Where you lived and worked, and your diagnosis.

2. We look at the facility

   We review public emissions and regulatory records.

3. We review the records

   With your permission, we gather medical and work records.

4. We explain what we see

   We tell you plainly whether a claim may be possible and which deadlines apply.

A cancer diagnosis near a sterilizer raises a question. The answer depends on the evidence about exposure and the science about that cancer.

Plain English

Medical, Health & Insurance

Terms you may see in an EtO case.

Exposure terms

ppm

Parts per million, the unit used for OSHA's EtO limits3.

Time-weighted average

An exposure level averaged over a work shift.

Air modeling

Estimates of how emissions spread, rather than direct measurements of what a person breathed.

Health terms

Lymphoma

Cancer of the lymphatic system, such as non-Hodgkin lymphoma.

Leukemia

Cancer of blood-forming tissue.

Claim terms

Discovery rule

A rule that starts a deadline when an injury and its cause were or should have been known8.

NESHAP

EPA's national emission standards for hazardous air pollutants.

Questions

Frequently asked ethylene oxide questions

Short answers to the questions people ask first.

What cancers have been linked to ethylene oxide?

NCI says lymphoma and leukemia are most frequently reported with occupational exposure, and stomach and breast cancers may be associated1.

I live near a sterilizer. Was I exposed?

Possibly, but living nearby does not establish how much you breathed. Distance, years, wind and emissions all matter.

Is ethylene oxide the same as antifreeze?

No. EtO is used to make chemicals such as antifreeze ingredients1, but it is a different chemical.

What are the workplace limits?

OSHA allows 1 ppm averaged over 8 hours and 5 ppm over 15 minutes3.

Are the EPA sterilizer rules in effect?

EPA finalized a rule in 2024 and has proposed rescinding key parts5. Status can change, so we recheck it.

Can a family file an ethylene oxide lawsuit after a death?

Possibly, through a wrongful death claim, depending on state law and deadlines.

How long do I have to file?

Many states use discovery rules for exposure claims, such as California's8. Ask early.

What does an ethylene oxide attorney at CBW look at first?

Where and when you lived or worked, the facility involved and your diagnosis.

How much does it cost to talk to an EtO lawyer at CBW?

Telling us your story costs nothing, and contacting us does not create an attorney-client relationship.

Tell Us Your Story

EtO cases depend on detailed exposure histories and facility records.

Tell us what happened. CBW Law will review your information and explain what we see. Submitting information does not establish an attorney-client relationship or guarantee representation.

Tell Us Your Story →Call (800) 476-2416

This page is general information about ethylene oxide exposure. It is not legal or medical advice and does not create an attorney-client relationship. Living or working near a facility, a diagnosis or a study association does not, by itself, establish exposure, causation or legal responsibility. Laws, regulations and deadlines differ by state and change over time, and no outcome can be promised.