Cal/OSHA Heat Illness Plan Inspection Guide

Having a Plan Is Not the Same as Being Ready for an Inspection

Most California employers with outdoor workers have some version of a heat illness prevention plan. After years of enforcement activity under Section 3395, the requirement to have something in writing is fairly well understood. What is less well understood is the difference between having a document and having a compliant program.

Cal/OSHA inspections do not stop at the policy binder. Inspectors look at whether written procedures reflect how work is actually performed, whether training has been documented and delivered to the right people, whether acclimatization was implemented when new employees started or returned from absence, and whether records exist to show that cool-down procedures were followed during heat events. A policy that exists on paper but is not implemented in practice provides very limited protection during an inspection.

Since July 2024, California employers with indoor workplaces that reach 82 degrees Fahrenheit are also subject to inspection under Section 3396, the indoor heat illness prevention standard. Many employers have not yet reviewed their programs against the new requirements. That gap is one of the most common compliance exposures for California businesses heading into the 2026 summer season.

What Triggers a Cal/OSHA Heat Illness Inspection

Employee complaints. A current or former employee can file a complaint alleging that heat illness prevention requirements are not being met. These complaints can be anonymous and frequently result in an inspection.
Incident or injury reports. Any reported heat-related illness or injury at the workplace will trigger an investigation.
Programmed inspections. Cal/OSHA conducts targeted inspections in high-risk industries during heat season. Construction, agriculture, landscaping, warehousing, and other industries with elevated heat illness risk receive increased inspection activity during summer months.
Heat advisories. During periods of extreme heat, Cal/OSHA increases inspection activity in outdoor and indoor work environments. The agency issued heat advisories in March 2026 before summer temperatures even arrived.

What Inspectors Actually Look For

Written Programs

Inspectors will ask to see your written heat illness prevention plan. They will review it for completeness, including whether it addresses all of the elements required under Section 3395, Section 3396, or both. A plan that is generic, outdated, or does not reflect the actual conditions at the worksite is likely to generate citations.

Training Records

Training documentation is one of the most heavily scrutinized elements of any heat illness prevention inspection. Inspectors will ask for records that show who was trained, when, what content was covered, and who delivered the training. Supervisor training records will be reviewed separately from worker training records.

Acclimatization Records

The acclimatization requirement is one of the areas where inspectors most frequently find violations. Having a written acclimatization policy does not satisfy the requirement. Inspectors look for evidence that the policy was implemented: work schedules, supervisor logs, or other documentation showing the policy was followed.

Water, Shade, and Cool-Down Area Access

For outdoor worksites, inspectors will observe whether shade is available and accessible where employees are working. For indoor workplaces, they will look for the designated cool-down area and verify that it meets the temperature requirement of below 82 degrees Fahrenheit. These are physical conditions that inspectors can observe during a site visit.

Temperature Monitoring Records

For employers subject to Section 3396, inspectors will request temperature monitoring logs showing that temperatures were tracked during work hours when heat illness risk was present. The absence of these records is itself a citable violation.

Emergency Response Procedures

Inspectors will review your emergency response procedures for completeness and practicality. They will ask whether employees and supervisors know what to do if someone shows signs of heat illness. If the emergency response procedures exist in writing but supervisors cannot describe them, that is a gap.

IIPP Integration

Cal/OSHA will also review whether heat illness prevention is addressed in the employer’s Injury and Illness Prevention Program. The IIPP must include heat illness hazards in its hazard identification and correction procedures, and the training and communication requirements in the IIPP must be aligned with the heat illness prevention program.

Common Violations and Their Consequences

Failure to have a written heat illness prevention plan
Written plan that does not reflect actual workplace conditions
Failure to train employees before heat exposure
Absence of supervisor-specific training documentation
Failure to implement or document acclimatization procedures
Failure to provide adequate shade or a compliant cool-down area
Failure to monitor and document indoor temperatures

Serious violations can result in penalties up to $25,000 per violation. Willful violations carry substantially higher penalties. The December 2024 citation against a Van Nuys landscaping company exceeded $276,000 for willful violations of the outdoor standard.

How to Assess Where Your Program Actually Stands

The most practical first step is an honest review of what your current program includes and what it is missing. The California Heat Illness Prevention Checklist from PCS Safety is designed to walk you through the key elements of a compliant program, including written procedures, training documentation, acclimatization records, physical conditions, and IIPP integration.

If your review surfaces gaps, PCS Safety works with California employers to develop compliant heat illness prevention programs, deliver training that meets Cal/OSHA’s content requirements for both supervisors and workers, and conduct safety program audits and gap analysis to identify what needs to be corrected before an inspection occurs.

The time to find the gaps in your program is before Cal/OSHA does.

Is Your Heat Illness Prevention Plan Actually Ready for a Cal/OSHA Inspection?