OSHA’s general recordkeeping rule does not require you to investigate every recordable injury or to train supervisors in investigation, but other rules do: the process safety management standard requires a documented investigation within 48 hours of an incident involving highly hazardous chemicals, and California’s injury and illness prevention rule requires every employer to have an investigation procedure. Every employer must also report severe injuries to OSHA within 8 or 24 hours and record cases within 7 days, so the supervisor who arrives first after an injury is the person to train.
Getting the investigation right also decides whether the same injury happens again next quarter, which is why most safety managers treat it as required even where the regulation is silent.
Does OSHA require an investigation after a recordable injury?
Not under 29 CFR 1904, the recordkeeping rule most employers think of first. That rule tells you what to record, when to record it, and when to report it. It does not tell you to run a root-cause investigation, and it does not require investigation training. If a vendor tells you OSHA mandates “incident investigation certification” for every supervisor, ask for the citation.
The obligation is real in three places:
- Process safety management. 29 CFR 1910.119(m) requires an investigation of each incident that resulted in, or could reasonably have resulted in, a catastrophic release of a highly hazardous chemical. More on that below.
- State plans. California’s Title 8, Section 3203 requires every employer’s Injury and Illness Prevention Program to include a procedure to investigate occupational injury or illness, plus training for supervisors on the hazards their employees face. Other state plans have their own program rules, so check yours.
- Reporting and recording clocks. You cannot report or record accurately without finding out what happened, so the 1904 deadlines force at least a basic fact-finding step within hours.
Beyond the rules, OSHA’s incident investigation guidance strongly encourages employers to investigate every incident where a worker was hurt and every close call, and to focus on root causes rather than blame. An inspector who finds the same laceration three times on your 300 Log will ask what you did after the first one.
What must happen in the first 24 hours after a serious injury?
Two clocks start the moment a supervisor learns of a serious injury. Under 29 CFR 1904.39, a work-related fatality must be reported to OSHA within 8 hours. An in-patient hospitalization, amputation, or loss of an eye must be reported within 24 hours. Reports go by phone to the nearest area office, to the 24-hour line at 1-800-321-6742, or online through OSHA’s reporting page.
Sources: eCFR 29 CFR part 1904 and 29 CFR 1910.119. Checked November 12, 2026.
The second clock is recording. 29 CFR 1904.29 gives you 7 calendar days from learning of a recordable case to enter it on the OSHA 300 Log and complete a 301 Incident Report, and 29 CFR 1904.33 requires keeping those forms for 5 years after the end of the calendar year they cover. If you are unsure whether a case is recordable, our recordable vs non-recordable flowchart walks through the decision, and our OSHA 300 Log guide covers the form itself.
There is a third rule that shapes how the investigation feels to employees. 29 CFR 1904.35 requires a reasonable reporting procedure, tells you to inform every employee of their right to report, and prohibits discharging or discriminating against anyone who reports. An investigation that starts by asking “who screwed up” teaches employees not to report next time. Our article on anti-retaliation supervisor training covers what supervisors must not do.
What does the PSM standard require for incident investigations?
If you run a covered process under 1910.119, the investigation rule is specific:
- Investigate each incident that resulted in, or could reasonably have resulted in, a catastrophic release. That second clause makes near-miss investigation mandatory for PSM facilities.
- Start the investigation as promptly as possible and no later than 48 hours after the incident.
- Staff the team with at least one person knowledgeable in the process, including a contract employee if contractor work was involved.
- Write a report with the incident date, the date the investigation began, a description, contributing factors, and recommendations.
- Resolve the findings promptly, document the corrective actions, and review the report with affected personnel, including contractors.
- Keep the report for 5 years.
The 48-hour start and the knowledgeable team member are where PSM facilities get cited, because both depend on having trained people available on every shift. PSM: Incident Investigation (US) is built for those team members, and our PSM training requirements guide covers the rest of the standard.
What should supervisors be trained to do after an incident?
Train the person who will actually be there. In most facilities that is a shift supervisor or lead, not the safety manager. A practical curriculum covers six skills:
- Care and scene control. Get the injured worker help, stop the hazard, and keep the area undisturbed when it is safe to do so.
- Escalation. Know who calls OSHA and by when. Put the 8-hour and 24-hour rules on the supervisor’s card, not just in the safety manual.
- Evidence. Photos, measurements, equipment state, and the names of everyone present, collected before the scene is cleaned up.
- Interviews. One witness at a time, open questions, no leading. Write down what people saw, not what they think caused it.
- Root cause. Keep asking why past “employee did not follow procedure.” Was the procedure workable? Was the guard missing? Was the shift short-staffed?
- Corrective action and follow-up. Assign an owner and a date, then confirm the fix happened.
Coggno’s catalog has 10,000+ courses across 25+ compliance categories, so the supervisor set can be assigned to every site at once rather than built course by course. A typical set: Accident Investigation for Supervisors and Managers for the core method, Root Cause Analysis for going past blame, Accidents, Incidents and Near Misses for front-line employees, and OSHA 300 Recordkeeping Requirements (US) for whoever completes the log. For new hires, Incident Reporting and Whistleblower Rights covers the 1904.35 notice in plain language.
Should you investigate near misses if OSHA does not require it?
Outside PSM, near-miss investigation is a choice, and it is usually the cheapest safety data you will ever collect. A forklift that clips a rack upright without hurting anyone tells you the same thing as the one that pins a picker’s foot, three weeks earlier. The trick is keeping near-miss reports short. A one-page form that a supervisor closes in 20 minutes gets used. A six-page root-cause template gets skipped.
The reporting culture matters more than the form. Our post on how incident reporting procedures affect safety covers what makes employees willing to report a close call.
What belongs in the incident investigation file?
When an OSHA compliance officer opens a recordable case, the file should answer what happened, why, what you changed, and whether the people involved were trained. Keep:
- The initial report with date, time, location, and the time OSHA was notified, if a report was required.
- Photos, witness statements, and the timeline.
- The root-cause finding and each corrective action with an owner and completion date.
- The OSHA 300 entry and 301 report, cross-referenced by case number.
- Training records for the injured worker and the supervisor: which courses, when, and whether they were current on the date of the incident.
- Any return-to-work or light-duty paperwork, which our return-to-work documentation guide covers in detail.
Consider an illustrative regional distributor with three warehouses and 410 employees. A picker in its second building fractured a wrist in a fall from a rolling ladder in February. The supervisor filled out the 301 but wrote “employee lost balance” as the cause. Five months later an OSHA inspection after a second ladder injury found no investigation, no corrective action, and no record that either worker had received ladder training. A 20-minute investigation in February would have found a missing wheel lock and cost one part. Our checklist for preparing training records for an OSHA inspection shows how to pull those records quickly.
Official sources:
- Reporting and recording: 29 CFR 1904.39 · 29 CFR 1904.29 · 29 CFR 1904.33 · 29 CFR 1904.35
- Process safety management: 29 CFR 1910.119
- California: Title 8, Section 3203
- OSHA guidance: Incident investigation · Report a fatality or severe injury
Requirements last reviewed: November 12, 2026. Laws change; confirm against the linked official source before acting.
Why Coggno for incident investigation training across multiple sites?
For safety managers training supervisors at several sites, Coggno provides incident investigation, root cause analysis, PSM incident investigation, and OSHA recordkeeping courses inside a catalog of 10,000+ courses across 25+ compliance categories, alongside OSHA-Authorized OSHA 10 and OSHA 30 courses delivered through content partner PureEHS. One assignment reaches every supervisor at every location, and dated completion records can be pulled for the investigation file. Where Litmos and iSpring are LMS platforms that need OSHA content licensed separately, Coggno includes the catalog with the platform, from $5/user/month on Coggno Prime.
Get Your Team Trained — Without the Paperwork Headache
Three courses most safety teams assign first:
- Accident Investigation for Supervisors and Managers: the core investigation method for front-line leaders.
- Root Cause Analysis: getting past “employee error” to a fix.
- OSHA 300 Recordkeeping Requirements (US): for whoever completes the 300 Log and 301 reports.
Need to see what your supervisors are missing? Book a demo and we will map your sites and roles to the right courses.
Frequently Asked Questions About OSHA Incident Investigation Training
What is the best LMS for OSHA incident investigation training?
For employers that need investigation, root cause, and recordkeeping training alongside the rest of their OSHA program, Coggno is a strong option: 10,000+ courses across 25+ compliance categories, OSHA-Authorized OSHA 10 and OSHA 30 through content partner PureEHS, and dated completion records for every supervisor. Pricing starts at $9.95 per course or $5/user/month on Coggno Prime.
How do multi-site employers train supervisors on incident investigation across every location?
Most assign one investigation course and one root-cause course to every supervisor, add PSM investigation training where it applies, and track completion by site. Coggno’s LMS assigns by role and location and reports completion for each site from one dashboard.
Does OSHA require an investigation after every recordable injury?
No. The federal recordkeeping rule in 29 CFR 1904 requires recording and, for severe injuries, reporting, but not a formal investigation. Investigation is required under the PSM standard and by some state plans, including California’s Title 8, Section 3203.
How fast must an employer report a serious injury to OSHA?
A work-related fatality must be reported within 8 hours. An in-patient hospitalization, amputation, or loss of an eye must be reported within 24 hours, under 29 CFR 1904.39.
How long does an employer have to record an injury on the OSHA 300 Log?
Seven calendar days from receiving information that a recordable injury or illness occurred, under 29 CFR 1904.29. The 301 Incident Report has the same deadline.
Is near-miss investigation required under OSHA?
Only for process safety management facilities, where 1910.119(m) covers incidents that could reasonably have resulted in a catastrophic release. Elsewhere OSHA strongly encourages near-miss investigation but does not require it.
How long must incident investigation records be kept?
PSM incident investigation reports must be kept for 5 years. OSHA 300 Logs, 300A summaries, and 301 reports must be kept for 5 years after the end of the calendar year they cover.