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29 CFR 1910.119(m)

Element 11: Incident Investigation

Every incident — and every near miss — must be investigated and the findings used to prevent recurrence.

$4,000-$15,625
Penalty Range
Common
Citation Frequency
#6 Most Cited
PSM Ranking
Element Overview

What Is Incident Investigation Under PSM?

Section 1910.119(m) requires employers to investigate every incident that resulted in — or could reasonably have resulted in — a catastrophic release of a highly hazardous chemical. The scope deliberately includes near misses: the "or could reasonably have resulted in" language means that a release that was narrowly averted must be investigated just as seriously as one that caused actual harm.

OSHA requires that the investigation begin as promptly as possible, but no later than 48 hours following the incident. Speed matters because evidence degrades: equipment gets repaired, memories fade, and operators rotate out. The investigation team must include at least one person knowledgeable in the process and, when the incident involved contract employees, a contract employee must be included.

A written report must be produced. That report must address the date of incident, date investigation began, description of the incident, factors contributing to the incident, and recommendations from the investigation. The recommendations must be resolved in a timely manner with documentation of the resolution.

Regulatory Text

What the Standard Actually Requires

The employer shall investigate each incident which resulted in, or could reasonably have resulted in a catastrophic release of highly hazardous chemical in the workplace. An incident investigation shall be initiated as promptly as possible, but not later than 48 hours following the incident.— 29 CFR 1910.119(m)(1)-(m)(2)
  • 1
    Scope — Near Misses Included — Investigation required for any incident that resulted in OR could reasonably have resulted in a catastrophic release.
  • 2
    48-Hour Initiation — Investigation must begin within 48 hours of the incident.
  • 3
    Qualified Team — Team must include at least one person knowledgeable in the process and a contract employee if the incident involved contractors.
  • 4
    Written Report — Report must document: date, date investigation began, incident description, contributing factors, and recommendations.
  • 5
    Resolution of Recommendations — All recommendations must be resolved in a timely manner and documented.
  • 6
    Report Review — Reports must be reviewed with all affected personnel whose job tasks are affected by the findings or recommendations.
  • 7
    Retention — Investigation reports must be retained for five years.
Compliance Failures

Common Violations OSHA Cites

These are the deficiencies inspectors most frequently document in Incident Investigation programs. Each can represent a separate citation.

Frequently Cited Violations

  • Near misses not investigated — only incidents with actual releases or injuries trigger investigations
  • Investigation not initiated within 48 hours
  • Written report does not address all required elements, particularly contributing factors
  • Investigation recommendations not resolved — open action items with no target date or follow-up
  • Reports not reviewed with affected employees or contractors
  • Investigation reports retained for less than five years

What Inspectors Look For

  • Requesting the incident/near miss log and investigating a sample to verify 48-hour initiation
  • Reviewing investigation reports for quality — are root causes identified or just immediate causes?
  • Checking recommendation tracking logs for open items and resolution timeframes
  • Asking workers if they were informed of investigation findings from recent incidents
Real-World Impact

Consequences of Incident Investigation Failures

Unlearned lessons from incidents directly enable the next one. The CSB has documented numerous cases of incidents with near-identical root causes at the same facility — evidence that investigation findings were not acted upon. The 2018 Watson Grinding explosion involved a propylene release connected to known process hazards that prior incidents had revealed but not prompted corrective action.

Penalty Exposure — Incident Investigation

OSHA penalty range for Incident Investigation violations: $4,000-$15,625 per violation. Incident investigation violations are particularly serious when OSHA can demonstrate that a previous similar incident was not adequately investigated and its findings not implemented — and a subsequent incident occurred. This pattern can support willful violation classification.

Documentation Requirements

Documents Your INC Program Needs

An OSHA compliance inspection for Incident Investigation will typically request the following. Gaps in any of these areas may result in citations.

Required Documentation

  • Incident and near miss investigation log
  • Investigation reports for all incidents in past five years
  • Recommendation tracking log with resolution documentation
  • Evidence of report review with affected employees
  • Investigation team qualification records
OSHA Letter of Interpretation

Related LOI Guidance

OSHA has clarified these specific questions about the Incident Investigation element through official Letters of Interpretation:

Must Prior Incidents Be Included in the PHA?

Get Incident Investigation Documents — Ready to Use

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