When an incident or near-miss reveals that a PHA missed or underestimated a hazard scenario, OSHA expects the facility to revisit the PHA, not just close the incident investigation and file the report. The interaction between the incident investigation element and the PHA element is an area where facilities frequently fall short. These letters address whether incident findings require a PHA update, how incident learnings should be incorporated into the next revalidation, and the obligation to apply lessons across similar processes at the same facility.
What OSHA Has Said
Oct 2, 2020
Incident Findings Requiring PHA Update or Interim Safeguards
OSHA addresses situations where an incident reveals a previously unidentified hazard scenario. OSHA expects the PHA to be updated to reflect the new understanding, and interim safeguards to be in place until the full update is complete.
Read OSHA Letter ↗
Oct 31, 1996
Applying Incident Lessons to Similar Processes
OSHA clarifies that lessons learned from incidents in one process unit must be evaluated for applicability to similar processes at the same facility. A site-wide review is expected, not just a single-unit corrective action.
Read OSHA Letter ↗
Aug 16, 1996
Near-Miss Incidents and PHA Review Obligations
OSHA addresses whether near-miss events trigger incident investigation and PHA review requirements. OSHA position: significant near-misses must be investigated and evaluated for PHA implications.
Read OSHA Letter ↗
⚡ Key Compliance Takeaway
Treat every significant incident or near-miss as a potential PHA gap indicator. If an investigation reveals a hazard scenario the PHA did not anticipate, update the PHA. Do not wait for the scheduled revalidation. Apply the lesson to similar units across the facility.