29 CFR 1910.1048: OSHA Formaldehyde Standard

Regulatory citation: 29 CFR 1910.1048, Formaldehyde

What Is the OSHA Formaldehyde Standard?

Section 1910.1048 applies to all occupational exposure to formaldehyde. This includes formaldehyde gas, its solutions such as formalin, and materials that release formaldehyde. It affects funeral homes, hospital and university laboratories, pathology labs, resin and wood product manufacturing, and textile finishing.

Why Formaldehyde Matters

Formaldehyde irritates the eyes, nose, throat and skin, and can cause skin and respiratory sensitization. Labels for materials that can release more than 0.5 ppm must warn that it may cause cancer.

Core Obligations

1. Keep Exposure Below the Limits (1910.1048(b) and (c))

The permissible exposure limit (PEL) is 0.75 parts per million (ppm) as an 8-hour time-weighted average (TWA). The short-term exposure limit (STEL) is 2 ppm over 15 minutes. The action level is 0.5 ppm as an 8-hour TWA.

2. Monitor Exposure (1910.1048(d))

Initial monitoring must identify employees who may be exposed at or above the action level or the STEL. Results at or above the action level must be repeated at least every 6 months. Results at or above the STEL must be repeated at least once a year under worst conditions. Monitoring may stop after two consecutive results, at least 7 days apart, are below both the action level and the STEL. Employees must be told their results within 15 working days after the employer receives them.

3. Set Up Regulated Areas (1910.1048(e))

Areas where exposure exceeds the PEL or the STEL must be regulated. Entrances must carry signs that include "AUTHORIZED PERSONNEL ONLY," and access is limited to trained, authorized people.

4. Control Exposure and Provide Respirators (1910.1048(f) and (g))

Engineering and work practice controls must reduce exposure to or below the PEL and STEL. Where they cannot, respirators must be used, including while controls are installed and in emergencies. Respirators must be used under a program that meets 29 CFR 1910.134.

5. Provide Protective Equipment, Eyewash and Showers (1910.1048(h) and (i))

Protective clothing and equipment must be provided at no cost to prevent skin and eye contact. Full body protection is required to enter areas above 100 ppm. Where skin may be splashed with solutions of 1% or more formaldehyde, quick drench showers are required. Where eyes may be splashed with solutions of 0.1% or more, eyewash facilities must be provided.

6. Control Leaks, Spills and Emergencies (1910.1048(j) and (k))

Employers must run a leak and spill detection program with regular visual checks, and repair leaks and clean up spills promptly. Procedures must be in place to minimize harm in an emergency.

7. Provide Medical Surveillance and Removal Protection (1910.1048(l))

Medical surveillance covers employees exposed at or above the action level or above the STEL, employees with signs or symptoms of exposure, and those exposed in an emergency. A medical disease questionnaire is given before assignment and at least annually. Where an employee has significant irritation or sensitization, medical removal protection keeps earnings, seniority and benefits in place for up to 6 months.

8. Label, Train and Keep Records (1910.1048(m) to (o))

Hazard communication rules apply to mixtures with more than 0.1% formaldehyde and to materials that can release 0.1 ppm or more. Labels for materials that can release more than 0.5 ppm must include "May Cause Cancer." Training is required at initial assignment, when a new exposure is introduced and at least annually. Exposure records must be kept for at least 30 years, and medical records for the duration of employment plus 30 years.

Common Compliance Approaches

Sample Worst-Case Tasks

Short-term sampling during tasks such as pouring formalin, changing specimen containers or cleaning spills shows whether the STEL is at risk.

Use Local Exhaust at the Bench

Downdraft tables, fume hoods and grossing stations with exhaust keep vapor away from the breathing zone.

Example: Formaldehyde Controls in Practice

A hospital pathology lab samples its grossing technicians and finds an 8-hour average of 0.6 ppm, above the action level, with short peaks near 2 ppm while filling containers. It installs a ventilated grossing station, moves container filling into a fume hood and resamples within 6 months. Technicians complete the medical questionnaire, receive annual training and have an eyewash station close to the bench.

Related regulations: OSHA Hazard Communication, OSHA respiratory protection, OSHA Laboratory Standard.

Note: In July 2025 OSHA proposed removing duplicative respiratory protection requirements from this standard. OSHA reopened the comment period in July 2026 and held public hearings in August 2026. No final rule had been issued as of October 2026, so check for updates. State plan states may set stricter rules.

Frequently Asked Questions

What are the formaldehyde exposure limits?

The PEL is 0.75 ppm as an 8-hour TWA and the STEL is 2 ppm over 15 minutes. The action level is 0.5 ppm.

Do I need a drench shower or just an eyewash?

It depends on concentration. Solutions of 0.1% or more that can splash the eyes need eyewash facilities. Solutions of 1% or more that can splash the skin need quick drench showers.

How long does medical removal protection last?

Up to 6 months, or until the employee is able to return to their original job or is found unable ever to return, whichever comes first.