What Happens in a Cal/OSHA Accident Investigation
After a reported serious injury, expect Cal/OSHA to open an accident inspection: an opening conference, a walkaround of the scene, private interviews with the injured worker and witnesses, a document request, and, if the Division intends a serious citation, a written notice giving you 15 days to respond. Citations must issue within six months of the occurrence of the violation, and you then have 15 working days from receipt to appeal.
Just had a serious injury? Call 949-954-6581. Two deadlines here cannot be recovered: the 15 day notice and the appeal window.
Why an accident inspection follows the report
The Guide to Cal/OSHA lists an "accident" inspection as one that results from the employer's duty to report a fatality, serious injury, or serious illness within eight hours, and ranks investigation of serious injury or exposure near the top of its inspection priorities, behind imminent hazards and fatalities. (Guide to Cal/OSHA) Its procedures direct that fatalities be investigated within 24 hours of receipt. (DOSH P&P C-1A) There is no advance notice.
For the general mechanics of any visit, read what to expect during a Cal/OSHA inspection.
The opening conference
The inspector shows a State of California photo ID and a Division business card, then holds an opening conference with the employer's highest ranking representative available. Cal/OSHA's procedures require the inspector to explain the purpose and scope of the inspection, walkaround procedures, workers' rights, and that the IIPP will be evaluated, and to request copies of the IIPP and the injury log. (DOSH P&P C-1A)
What to do in that room:
- Write down the inspector's name, district office, and the stated purpose and scope, word for word.
- Ask for every document request in writing. See our document request guide.
- Do not argue cause or fault.
The walkaround
The employer or its representative is expected to accompany the inspector. During the walkaround the inspector interviews employees, photographs the site, and may take measurements, sample, take video, and collect documentary and physical evidence. (Guide to Cal/OSHA)
- Order to Preserve. If it is necessary to keep the worksite or physical evidence as it is until the inspection is complete, the inspector issues an Order to Preserve. Comply exactly until it is released.
- Keep a parallel record. Photograph what the inspector photographs and note every measurement and sample.
- Scope can grow. Cal/OSHA's procedures allow an inspector to expand a partial inspection to a comprehensive one if conditions or employee comments suggest the need.
A proposed regulation on representatives during inspections, section 331.8, had a public hearing on April 1, 2026; check its status.
Interviews: employees and management
Cal/OSHA's pamphlet says the inspector will interview several employees in private, including the victim and any witnesses, and will conduct confidential interviews with employees and managers. (What to Expect from a Cal/OSHA Inspection) The inspection procedures require interviews of both employees and supervisors to test whether the IIPP is actually implemented, and direct inspectors to try to audio record interviews with consent or take written statements. (DOSH P&P C-1A)
For non-management employees, the rule is simple: they may speak with the inspector privately, out of the employer's presence. Do not sit in, do not coach, and do not suggest consequences. Reporting an injury and taking part in an inspection are protected, and the Labor Commissioner's Office takes retaliation complaints under Labor Code 6310. (Labor Commissioner)
For supervisors and managers, the interview is about your program, your training, and your knowledge of the hazard, which is exactly what decides whether a violation is classified as serious. Whether a manager's statements are treated as the company's, and who may attend a management interview, are questions to settle with OSHA defense counsel before the interviews start, not during them. Prepare managers to answer truthfully and from records.
The 15 day notice before a serious citation
Before issuing a serious citation, Cal/OSHA sends a Notice of Intent to Classify as Serious, often called the 1BY. The Guide says the employer has 15 days to respond before the citation is issued. (Guide to Cal/OSHA) An Appeals Board decision quotes the statute: the Division delivers the form "not less than 15 days prior to issuing a citation for a serious violation." (OSHAB decision)
This is the single most valuable window you control. Title 8, section 334(c)(3) lets the employer rebut the serious classification by showing it did not know and could not, with reasonable diligence, have known of the violation, through the steps it took beforehand, including training, procedures for finding and correcting the hazard, supervision, and safety communication, and by showing it acted effectively once the violation was discovered. It also lets the employer provide its explanation and any other information at any time before citations issue. (8 CCR 334) Build the response with counsel, from the records you secured on day one.
The six month citation limit
Cal/OSHA's enforcement manual states that a citation shall be issued no later than six months after the occurrence of the violation. (DOSH P&P C-1B) Do not treat that as a clean countdown from the injury date. When a violation "occurs," and whether a condition continued, are legal questions decided case by case. The same manual allows the period to run from discovery when an employer's failure to comply with a Title 8 reporting requirement kept the Division from learning of the violation. Another reason to make the 8 hour report.
Citations, the informal conference, and the appeal
The citation packet includes instructions on how to appeal. Citations must be posted at or near each place of violation for three working days or until the condition is abated, whichever is longer. You may request an informal conference with the district manager, which the Guide says may be held within 10 working days of issuance or before a scheduled appeal hearing. (Guide to Cal/OSHA)
The appeal deadline is 15 working days from receipt of the citation. An appeal is timely if the intent to appeal is mailed to or received by the Occupational Safety and Health Appeals Board within that time, and a communication to Cal/OSHA indicating an intent to appeal is not an appeal. (8 CCR 359) The Guide warns that a citation not appealed in time becomes a final order regardless of the date of a scheduled informal conference. Call counsel the day the envelope arrives. Penalty math and reduction levers are in our penalties guide.
What you control, and what you don't
You control: a timely report; the scene and evidence; records that already exist and can be found in four business hours; a prepared walkaround representative; a written record of scope and requests; your response to the 15 day notice; a timely appeal; and how the injured worker is treated, covered in our return to work guide.
You don't control: whether Cal/OSHA inspects, what employees say in private, how far the inspection expands, or what the general contractor or other employers on site say. On shared sites, read who gets cited under the multi-employer policy.
Common questions
Will Cal/OSHA inspect after every serious injury report?
Not always, but plan on it. Cal/OSHA ranks serious injury investigations among its highest inspection priorities.
Can I be present when Cal/OSHA interviews my employees?
Not for non-management employees who want to speak privately. Cal/OSHA interviews workers in private, and employees may bring their own representative at their discretion. Discuss management interviews with counsel in advance.
How long does Cal/OSHA have to issue a citation after an accident?
Cal/OSHA's manual says citations are issued no later than six months after the occurrence of the violation. When the violation occurred is a legal question, and a failure to report can extend the period.
How long do I have to appeal a Cal/OSHA citation?
Fifteen working days from receipt of the citation. Telling Cal/OSHA you intend to appeal does not count; the Appeals Board must receive or be mailed your intent to appeal within that time.
Does an informal conference stop the appeal clock?
No. The Guide to Cal/OSHA says a citation becomes a final order if the appeal is not filed within 15 working days, regardless of the date of a scheduled informal conference.
What is a 1BY?
Cal/OSHA's Notice of Intent to Classify a citation as Serious. You have 15 days to respond before the citation issues.
Facing an accident inspection? Book a call or see our services.
M Squared Safety Solutions, Inc., 981 Calle Negocio Suite 200, San Clemente, CA 92673, 949-954-6581. This page describes what the regulations and statutes say as of September 2026. It is not legal advice; for decisions about a specific employee or citation, involve employment or OSHA defense counsel.