California's workplace safety regulator has approved the most significant overhaul of employer first aid requirements in years, with the new rules expected to take effect January 1, 2027, pending final sign-off from the Office of Administrative Law.

The California Division of Occupational Safety and Health (Cal/OSHA) revisions cover both general industry and construction employers. The practical shift: first aid programs move from a physician-approved supply model to a structured, hazard-based approach built around kit contents, accessibility and workplace-specific planning.

For HR and safety leaders, this is not a procurement exercise. It is a documentation exercise.

What changes for general industry employers?

Three obligations stand out:

• Kit contents. Employers must provide a sufficient number of first aid kits, meeting either the American National Standards Institute (ANSI) Z308.1-2021 Class A standard or supplies determined by an authorized physician or other licensed healthcare professional.
• Accessibility. Employers must communicate kit locations to employees and, where feasible, mark them with signage, labeling or other visible means. Each kit must include a first aid guide aligned with ANSI standards or selected by an authorized healthcare professional.
• Workplace evaluation. Employers must assess whether standard supplies suffice, considering work locations and the nature of hazards. Serious or unusual hazards may require specialized supplies — for chemical exposures, heat-related illness, trauma or other foreseeable risks.

The old standard asked for "adequate" first aid materials. The new standard asks employers to prove adequacy against their own hazard profile.

What do construction employers face?

Much of the existing construction framework stays. What arrives is a set of operational duties:

• Provide enough kits based on employee access needs.
• Verify kit contents when a kit is placed into service.
• Keep supplies readily available throughout the project.

Construction employers must also communicate kit locations and make them visible through signage or similar methods whenever practicable, and run the same hazard evaluations as general industry to determine whether additional kits or specialized supplies are needed.

Cal/OSHA acknowledges the friction point: large jobsites, multi-employer projects and crews that move between locations. A kit verified at mobilization is only as good as its availability in week forty.

What about chemical injury supplies?

Employers that stock chemical injury treatment supplies face an extra layer. If those supplies sit in the kits, then emergency procedures, Safety Data Sheets (the standardized hazard documentation for chemical products) and employee training must all be consistent with kit contents and anticipated hazards. Consistency is the compliance test.

What should employers do before 2027?

The January 1, 2027 effective date leaves a workable runway — assuming someone owns the project. Steps CalChamber employment law expert Shannon Claire, J.D., identifies for employers:

• Review existing kits against ANSI-based standards.
• Evaluate whether current kit locations allow prompt access.
• Add signage or other methods to identify kit locations clearly.
• Conduct a workplace hazard assessment for specialized supply needs.
• Review hazard communication procedures and chemical emergency response protocols.
• Update emergency action plans, first aid programs and emergency medical services procedures as necessary.
• Review and update the Injury and Illness Prevention Plan (IIPP), California's mandatory written workplace safety program.

Why this matters beyond California

The revised regulations signal Cal/OSHA's expectation that first aid preparedness should mirror each workplace's specific risks. Compliance will likely require more than purchasing new supplies; accessibility, communication, training and hazard-specific planning all fall inside the new standard.

Employers with multi-state operations should also watch whether other state plans follow California's move from "adequate" supplies toward ANSI-referenced, hazard-assessed programs — a pattern California has set before.