Quick Highlights
- California's AB 2321, signed September 30, 2026, expands certain Cal/OSHA investigation and enforcement provisions beginning in 2027.
- The law requires additional investigations when serious workplace injuries, illnesses, or exposures involve a cited willful safety violation.
- New notification and referral provisions increase coordination between Cal/OSHA investigators and prosecutors.
- California's 2026–2027 High Hazard Industry List separately identifies industries that may be targeted for programmed inspections.
- Employers should review written safety programs, workforce training, hazard correction procedures, and incident-response practices before the new year.
What's Changing in Cal/OSHA Enforcement in 2027?
California employers face important changes to workplace safety enforcement in 2027 following the passage of Assembly Bill 2321.
Signed into law on September 30, 2026, AB 2321 expands certain investigation requirements, strengthens coordination with prosecutors, and broadens criminal liability provisions involving willful workplace safety violations that cause serious harm.
The law changes how certain serious incidents and violations are investigated and potentially prosecuted.
For employers, the message is clear: identifying hazards, correcting unsafe conditions, training employees, and maintaining accurate safety records remain essential parts of Cal/OSHA compliance.
Understanding what changes in 2027 can give California employers time to review their existing procedures before an incident or inspection exposes a gap.
What Is California AB 2321?
AB 2321 is a California workplace safety law that amends several sections of the state's Labor Code relating to occupational safety and health investigations.
The legislation expands the responsibilities of Cal/OSHA's Bureau of Investigations, which investigates certain workplace incidents that may involve criminal violations.
Under the new provisions, the Bureau must investigate incidents involving a serious injury, illness, or exposure when Cal/OSHA issues a citation for a willful violation.
Previously, mandatory investigations were more narrowly defined around fatalities, incidents affecting five or more employees, and certain other circumstances.
The legislation also strengthens requirements for sharing incident information and coordinating with prosecuting authorities.
These changes matter because serious workplace safety failures may now receive additional investigative scrutiny, particularly when an employer is cited for knowingly disregarding applicable safety requirements.
What Is a Willful Cal/OSHA Violation?
A willful violation generally involves intentional disregard of, or plain indifference to, workplace safety requirements.
It is different from an ordinary compliance mistake.
For example, an employer that becomes aware of a serious hazard but knowingly allows employees to continue working without appropriate protections may face greater enforcement exposure than one that promptly identifies and corrects the issue.
However, not every serious injury results in a willful citation. The classification depends on the facts and applicable legal standards.
Four Important Cal/OSHA Enforcement Changes Under AB 2321
1. Expanded Investigations Following Serious Workplace Incidents
One of the most significant changes involves the Bureau of Investigations.
Under AB 2321, the Bureau must investigate an incident involving a serious injury, illness, or exposure when Cal/OSHA issues a willful violation citation.
The law also retains mandatory investigation provisions for fatalities, qualifying incidents involving five or more employees, and requests for prosecution from division representatives.
For employers, this increases the importance of identifying and correcting known hazards before they result in an incident.
Written procedures, employee training, documented inspections, and corrective action records can all provide important information during an investigation.
2. Stronger Coordination With Prosecutors
AB 2321 also expands how workplace incidents are communicated to prosecuting authorities.
The legislation requires Cal/OSHA to notify the appropriate prosecuting authority immediately upon learning of certain qualifying incidents, including fatalities and serious injuries, illnesses, or exposures involving five or more employees.
It also establishes additional notification requirements involving responding fire and police agencies.
These provisions are intended to improve coordination when workplace incidents may involve criminal conduct.
Importantly, a referral or investigation does not automatically mean an employer has committed a crime. Criminal liability depends on the applicable law, evidence, and legal proceedings.
3. Broader Criminal Liability for Certain Willful Violations
AB 2321 amends California Labor Code Section 6425, which addresses criminal penalties for specified willful workplace safety violations.
The law expands the circumstances covered by the provision to include willful violations that cause serious injury, illness, or exposure, in addition to previously covered outcomes.
This is an important distinction from routine administrative Cal/OSHA citations.
The expanded provision concerns criminal offenses and potential court-imposed penalties, not an automatic increase in civil penalties for every workplace safety violation.
Employers should take particular care when responding to known serious hazards, prior citations, employee complaints, and incident findings.
4. Additional Accountability During Investigations
The legislation also establishes misdemeanor penalties for willfully obstructing certain authorized Cal/OSHA inspection or investigation activities.
Employers should make sure supervisors and management personnel understand their responsibilities when inspectors arrive.
That includes cooperating with lawful inspections, preserving relevant records, and responding appropriately to requests for information.
Attempting to conceal hazards, interfere with investigators, or disregard lawful orders can create additional legal exposure.
Cal/OSHA's 2026–2027 High Hazard Industry List: Another Reason to Review Compliance
AB 2321 is not the only California enforcement development employers should be watching.
Cal/OSHA has also released its 2026–2027 High Hazard Industry List.
The list identifies industries that may be selected for inspections based on occupational injury and illness rates.
Cal/OSHA's High Hazard Unit uses injury and illness data, workers' compensation information, citation history, and other factors to identify employers for potential inspections.
Industries with elevated workplace injury rates may face greater inspection attention.
Employers should review the official list to determine whether their industry is included rather than assume that every business within a broad sector will be targeted.
The High Hazard Industry List is separate from AB 2321. It does not establish the new investigation or criminal liability provisions, and inclusion does not automatically mean an employer will be inspected.
Together, however, these developments make workplace safety documentation, hazard correction, and inspection readiness particularly relevant heading into 2027.
How California Employers Can Prepare for Cal/OSHA Enforcement in 2027
Employers do not need to wait until a serious incident occurs to review their workplace safety practices.
The following checklist provides a starting point for identifying gaps and strengthening existing procedures.
1. Review Written Safety Programs
Start with the safety programs required for your California operations.
Review your Cal/OSHA Injury and Illness Prevention Program (IIPP), hazard communication procedures, emergency response plans, and other applicable written programs.
Confirm that they:
- Reflect current workplace hazards and operating conditions.
- Address California-specific requirements where applicable.
- Identify responsibilities for inspections and corrective actions.
- Are accessible to the employees and supervisors who need them.
- Are updated when equipment, processes, or work activities change.
Employers handling hazardous chemicals should also review our guide to the OSHA HazCom deadline and updated requirements.
A written program is only useful when employees understand it and the company follows it.
2. Address Known Hazards Before They Become Serious Incidents
AB 2321 makes the response to serious workplace hazards particularly important.
Employers should review prior inspection findings, employee complaints, near-miss reports, and incident investigations to identify unresolved safety concerns.
Focus on:
- Correcting hazards that could cause serious injury or illness.
- Assigning responsibility for corrective actions.
- Establishing deadlines and interim protections where appropriate.
- Verifying that corrective actions are completed.
- Documenting the steps taken to address identified hazards.
The objective is not simply to maintain a record of identified problems. It is to make sure those problems are actually corrected.
3. Verify Employee Safety Training
Employees need to understand the hazards associated with their work and the procedures designed to protect them.
Review training requirements by job role and work activity.
Depending on the operation, this may include hazard communication, personal protective equipment, machine guarding, lockout/tagout, fall protection, emergency procedures, and other applicable topics.
Employers should also confirm that:
- Required training has been completed.
- Training content reflects current procedures and equipment.
- Employees understand the information provided.
- Supervisors know how to recognize and address unsafe practices.
- Training records are maintained as required by applicable standards.
A centralized learning management system (LMS) can make it easier to assign courses, track completion, and identify employees who still need instruction.
4. Strengthen Workplace Incident Response Procedures
When a serious incident occurs, employers need a clear response process.
Review how your company handles emergency response, required notifications, investigations, evidence preservation, and corrective actions.
Make sure supervisors know who to contact and what steps to take.
California has specific requirements for reporting serious occupational injuries, illnesses, and fatalities to Cal/OSHA. Employers should review the state's accident reporting requirements and confirm that responsible personnel understand them.
For additional guidance, read our article on what to do after a workplace incident.
5. Check Compliance Across Multiple Worksites
Companies operating at multiple California locations should review how consistently their safety programs are implemented.
A corporate policy may establish general expectations, but each worksite must address its actual hazards and applicable requirements.
Compare locations performing similar work and review:
- Written safety procedures.
- Employee training completion.
- Workplace inspection practices.
- Open corrective actions.
- Supervisor responsibilities.
- Incident reporting and investigation procedures.
The goal is to identify inconsistencies before they lead to unsafe conditions.
For contractors working alongside other employers, understanding shared jobsite responsibilities is also important. Review our guide to OSHA responsibilities on multi-employer jobsites.
6. Prepare Supervisors for Cal/OSHA Inspections
Supervisors are often among the first employees to interact with inspectors.
Make sure they understand your company's inspection procedures, know where required records are maintained, and can identify the appropriate management contacts.
They should also understand the importance of cooperating with lawful inspections and providing accurate information.
Inspection readiness should be part of normal safety operations, not something addressed only after an inspector arrives.
Frequently Asked Questions About Cal/OSHA Enforcement Changes
What Cal/OSHA enforcement changes take effect in 2027?
California AB 2321 expands certain workplace safety investigation requirements, strengthens notification and coordination with prosecutors, and broadens criminal liability provisions involving willful violations that cause serious injury, illness, or exposure.
Does AB 2321 create new workplace safety training requirements?
AB 2321 primarily changes investigation and enforcement provisions. It does not establish a new universal employee training requirement.
Employers must continue meeting applicable Cal/OSHA training requirements for their workplaces and operations.
Does every serious workplace injury trigger a criminal investigation?
No. AB 2321 establishes specific circumstances requiring Bureau of Investigations involvement, including certain incidents involving willful violation citations.
A serious injury does not automatically establish criminal wrongdoing.
Which California employers should pay attention to AB 2321?
All California employers should understand applicable safety requirements, but the changes are particularly relevant to businesses with significant workplace hazards, prior serious safety concerns, or operations where failures could result in serious injuries, illnesses, or exposures.
What is the Cal/OSHA High Hazard Industry List?
The High Hazard Industry List identifies industries that may be targeted for inspections based on occupational injury and illness data. It is a separate Cal/OSHA enforcement initiative and is not created by AB 2321.
