General Industry (29 CFR 1910)

Ethylene Oxide

Verified vs OSHA sources · 2026-10-05

29 CFR 1910.1047

29 CFR 1910.1047 protects general-industry workers from ethylene oxide (EtO), a carcinogenic and reproductive-hazard gas used to sterilize medical devices and in chemical manufacturing. It caps exposure at 1 ppm as an 8-hour TWA with a 5 ppm 15-minute excursion limit and a 0.5 ppm action level, requiring monitoring, controls, regulated areas, and medical surveillance.

29 CFR 1910.1047 at a glance

PEL: 1 ppm as an 8-hour TWA (29 CFR 1910.1047(c)(1))
Excursion limit: 5 ppm over any 15-minute period (1910.1047(c)(2))
Action level: 0.5 ppm (8-hr TWA): triggers monitoring and medical surveillance
Where used: Sterilizing heat-sensitive medical devices; chemical manufacturing
Max penalty (2026): $16,550 per serious violation; $165,514 per willful
The #1 confusion: EtO off-gasses from sterilized items too: exposure is not only at the sterilizer

What 29 CFR 1910.1047 requires (plain English)

29 CFR 1910.1047 protects general-industry workers from ethylene oxide (EtO), a flammable, carcinogenic, and reproductive-hazard gas. Its dominant use is sterilizing heat- and moisture-sensitive medical devices and supplies, and it is also an intermediate in chemical manufacturing (antifreeze, detergents, solvents).

The standard sets a permissible exposure limit of 1 ppm as an 8-hour time-weighted average and an excursion limit of 5 ppm over any 15 minutes, with an action level of 0.5 ppm that triggers monitoring and medical surveillance. Where exposures exceed the limits, engineering controls (local exhaust ventilation at sterilizers, dedicated aeration) are the primary means of compliance, with regulated areas, respirators, emergency procedures, and training added.

1910.1047 is a Subpart Z substance-specific health standard. Because EtO is used so heavily in hospital and third-party sterilization and off-gasses from sterilized loads during aeration, the standard's monitoring and ventilation requirements are central to protecting sterile-processing workers.

The regulatory text

“The employer shall ensure that no employee is exposed to an airborne concentration of EtO in excess of one (1) part EtO per million parts of air (1 ppm) as an 8-hour time-weighted average (8-hour TWA).”

29 CFR 1910.1047(c)(1)

Key facts about 29 CFR 1910.1047

The ethylene oxide PEL is 1 ppm as an 8-hour TWA (1910.1047(c)(1)).
An excursion limit caps exposure at 5 ppm over any 15 minutes (1910.1047(c)(2)).
The action level is 0.5 ppm (8-hr TWA) and triggers monitoring and medical surveillance.
EtO is a carcinogen (leukemia, lymphoma) and a reproductive hazard.
Its main use is sterilizing heat- and moisture-sensitive medical devices.
EtO off-gasses from sterilized items during aeration, not only at the sterilizer.
Engineering controls (local exhaust, dedicated aeration) are the primary means of compliance.

Scope: who 29 CFR 1910.1047 applies to

Regulatory framework: General Industry (29 CFR 1910)
Citation reference: 29 CFR 1910.1047
Enforcement status: In force and enforced
Jurisdiction: Federal OSHA (29 State-Plan jurisdictions may be stricter)

State-Plan states (e.g. California, Washington, Michigan) operate OSHA-approved programs that must be at least as effective as federal OSHA and frequently impose higher penalties or additional requirements. Confirm the rule as adopted in your state.

Key requirements of 29 CFR 1910.1047

#	Employer obligation
1	Limit exposure to 1 ppm PEL (8-hr TWA)
2	Excursion limit of 5 ppm (15-minute)
3	Monitor exposure above action level (0.5 ppm)
4	Provide medical surveillance
5	Provide emergency showers and eye wash

Summarized from the text of 29 CFR 1910.1047. Always read the full regulation for the binding language.

Common Ethylene Oxide (EtO) violations

Deficiencies OSHA cites under 29 CFR 1910.1047 include the ones below, in no particular order. Distinct deficiencies can be cited as separate items, and each serious item carries up to $16,550 (2026). Broader per-instance stacking exists but is a discretionary, case-by-case OSHA enforcement policy, not an automatic multiplier.

No exposure monitoring around sterilizers and aeration areas (1910.1047(d)).
Exposures above the PEL or excursion limit without adequate ventilation (1910.1047(f)).
No medical surveillance for workers at or above the action level (1910.1047(i)).
No regulated area where exposure exceeds the PEL or excursion limit (1910.1047(e)).
No emergency procedures for an EtO release (1910.1047(h)).

Exposure is not only at the sterilizer: sterilized items off-gas EtO during aeration

A common gap is controlling exposure only at the sterilizer door and overlooking that sterilized items continue to off-gas ethylene oxide during aeration, and that residual EtO escapes when loads are handled before aeration is complete. Workers in sterile processing can be exposed while unloading, transferring, and storing items, not just during the cycle. That is why 1910.1047 requires monitoring across the operation, dedicated aeration with ventilation, and regulated areas where the 1 ppm PEL or 5 ppm excursion limit is exceeded: controlling the sterilizer alone leaves the downstream exposure unaddressed.

What OSHA inspectors look for

A compliance officer checks exposure monitoring around sterilizers and aeration areas, verifies engineering controls and regulated areas where the PEL or excursion limit is exceeded, and confirms medical surveillance above the action level. Sterilizer door-opening and aeration releases without ventilation or monitoring are the classic findings.

Example: how a violation is cited

A hospital sterile-processing worker is exposed to ethylene oxide when a sterilizer is opened before the aeration cycle completes, with no local exhaust or monitoring. OSHA cites 1910.1047 for the overexposure and missing controls, with penalties from $16,550.

Illustrative example, not a specific OSHA case.

Ethylene Oxide (EtO) compliance checklist

Use this to evaluate your compliance with 29 CFR 1910.1047. Each item is a key requirement OSHA may verify during an inspection.

Monitor exposures at sterilizers, during load handling, and in aeration areas.
Reduce exposure to the 1 ppm PEL and 5 ppm excursion limit with local exhaust ventilation and dedicated aeration.
Provide medical surveillance for workers at or above the 0.5 ppm action level.
Establish regulated areas where exposure exceeds the limits.
Develop emergency procedures for an EtO release and train workers.
Provide respirators and PPE where controls are insufficient.

2026 penalties for 29 CFR 1910.1047

Maximums set by 29 CFR 1903.15(d). 2026 amounts unchanged from 2025 (no CPI adjustment; OMB M-26-11). Not an increase. The 2025 OSHA penalty levels remain in effect for 2026; OSHA made no inflation adjustment for 2026. 29 CFR 1903.15 identifies January 15, 2025 as the effective reference for these amounts, while OSHA's public penalties page currently references penalties assessed after Jan. 15, 2026.

Violation type	Minimum	Maximum	When it applies
Serious	$1,085	$16,550	Substantial probability of death or serious physical harm.
Other-Than-Serious	$0	$16,550	Relates to safety/health but unlikely to cause death or serious harm.
Willful	$11,823	$165,514	Intentional, knowing, or voluntary disregard of the requirement.
Repeated	$4,256	$165,514	A substantially similar violation cited within the last 5 years.
Failure to Abate	None	$16,550/day	up to $16,550 per day; total capped at 30x the daily amount (FOM Ch.6)

EtO citations follow health inspections of sterilization and chemical operations. Serious violations reach $16,550 and willful or repeat violations $165,514; sterilizer releases without controls and no surveillance are the usual findings.

Maximums and the willful minimum are set by 29 CFR 1903.15(d); the serious and repeated minimums are OSHA policy floors from its annual penalty adjustment memo. OSHA applies gravity-based and size, good-faith and history reductions (FOM CPL 02-00-164 Ch.6). Estimates only, not legal advice.

The business case for Ethylene Oxide (EtO) compliance

Ethylene oxide is a potent carcinogen (linked to leukemia and lymphoma) and a reproductive hazard, and it is widely used to sterilize heat-sensitive medical devices. Because it is a gas that leaks from sterilizers and off-gasses from sterilized items, keeping exposure under the 1 ppm PEL with ventilation and monitoring is what protects the sterile-processing and manufacturing workers around it.

Free compliance tools for 29 CFR 1910.1047

SDS Gap Analyzer Respiratory Protection Program Builder Emergency Action Plan Builder

Ethylene Oxide (EtO) penalties by state

Penalties and enforcement vary by state. State-Plan states may impose higher penalties and additional requirements beyond federal 29 CFR 1910.1047.

Alabama Arkansas Colorado Connecticut Delaware District of Columbia

View all 50 states + DC →

Frequently asked questions about 29 CFR 1910.1047

What is the OSHA ethylene oxide PEL?

Under 1910.1047(c), the permissible exposure limit for ethylene oxide is 1 ppm as an 8-hour time-weighted average, with an excursion limit of 5 ppm over any 15-minute period. An action level of 0.5 ppm (8-hour TWA) triggers exposure monitoring and medical surveillance.

Where are workers exposed to ethylene oxide?

Most often in sterile processing: hospitals and third-party facilities that use EtO to sterilize heat- and moisture-sensitive medical devices. Exposure occurs at the sterilizer, when loads are handled before aeration is complete, and from sterilized items off-gassing during aeration. EtO is also used in chemical manufacturing. Any of these can exceed the OSHA limits without ventilation and controls.

Why is ethylene oxide regulated so strictly?

Because it is a potent carcinogen, associated with leukemia and lymphoma, and a reproductive hazard, and it is a gas that leaks and off-gasses readily. The combination of serious chronic health effects and widespread use in medical sterilization is why 1910.1047 sets a low 1 ppm PEL with a short-term excursion limit, monitoring, regulated areas, and medical surveillance.

Do sterilized items continue to release ethylene oxide?

Yes. Items sterilized with EtO retain residual gas and off-gas it during aeration, so workers can be exposed while handling, transferring, and storing loads, not only during the sterilization cycle. This is why 1910.1047 requires dedicated aeration with ventilation and monitoring across the operation, not just control at the sterilizer door.

Regulatory history of 29 CFR 1910.1047

OSHA issued the ethylene oxide standard in 1984 (49 FR 25734), setting the 1 ppm PEL, and added the 5 ppm excursion limit in 1988 (53 FR 11414) after documenting cancer and reproductive risk. It remains a key protection for the large sterile-processing workforce in hospitals and third-party sterilization facilities.

Related glossary terms

Key terms that appear in 29 CFR 1910.1047, each with a full plain-English explainer.

Permissible Exposure Limit (PEL)Action Level Medical Surveillance Engineering Controls Respiratory Protection Program IDLH

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29 CFR 1910.1003

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Primary sources

OSHA figures on this page are imported from HazComFast's verified regulatory module (verified 2026-10-05 against eCFR, OSHA.gov, and the Federal Register).

This page is an educational summary, not legal advice. OSHA standards and penalty amounts change; confirm requirements against the current regulation and your applicable State-Plan before acting.

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