Indoor Heat Illness Rules for Restaurant Kitchens: Cal/OSHA Section 3396

Updated November 8, 2026. This article was first written in early May 2025, as California restaurants headed into their first full summer under Cal/OSHA’s indoor heat standard. It describes the rule as it stood then. Anything that happened later is kept separate in the “Current context” section near the end. It is general information, not legal advice.

The hottest room in the building is usually the kitchen

When people talk about heat illness at work, they usually picture farmworkers, roofers, or delivery drivers. Restaurant operators know a different picture: a line cook working a six-burner range next to a fryer, a dishwasher wrapped in steam, a pastry cook beside a deck oven, all inside a room that may never feel the breeze. On a July afternoon in Fresno, Riverside, or the Sacramento Valley, the back of the house can be hotter than the parking lot.

Since July 23, 2024, California has had a specific rule for that situation. Cal/OSHA’s Heat Illness Prevention in Indoor Places of Employment standard, Title 8, section 3396, was approved by the Office of Administrative Law and took effect immediately. The Department of Industrial Relations’ July 24, 2024 announcement named restaurants first in its list of workplaces covered, alongside warehouses and manufacturing facilities.

When the standard applies

Section 3396 applies to indoor work areas where the temperature equals or exceeds 82 degrees Fahrenheit when employees are present. “Indoor” means a space under a ceiling or overhead covering that restricts airflow and is enclosed along its entire perimeter by walls, doors, windows, or other barriers, whether open or closed. A kitchen with its back door propped open is still indoors under that definition.

There are exceptions. The standard does not apply to incidental heat exposures where an employee is exposed to temperatures at or above 82 and below 95 degrees for less than 15 minutes in any 60-minute period.

Outdoor work remains governed by the separate outdoor standard, section 3395. A restaurant with a patio, an outdoor bar, or a catering operation may be covered by both rules, a point we covered for front-of-house teams in our guide to heat illness prevention for outdoor hospitality staff.

The basic duties at 82 degrees

Once a covered work area reaches 82 degrees, several requirements apply to every employer.

Water. Employees must have access to potable drinking water that is fresh, pure, suitably cool, and free of charge, located as close as practicable to where they work. Where water is not plumbed, the employer must provide enough at the start of the shift for one quart per employee per hour, or have effective procedures to replenish it.

Cool-down areas. The employer must maintain one or more cool-down areas at all times while employees are present, large enough for employees on rest periods to sit in a normal posture without touching each other. Indoor cool-down areas must be kept below 82 degrees unless the employer demonstrates that is infeasible. An air-conditioned office, a break room, or a section of the dining room before service can serve the purpose if it is close to the kitchen and employees are not discouraged from using it.

Preventative cool-down rest. Employees must be allowed and encouraged to take a cool-down rest when they feel the need. Someone taking one must be monitored and asked about symptoms, encouraged to stay, and not ordered back to work until symptoms have abated, and in no event less than five minutes plus the time needed to reach the area.

Emergency response, observation, training, and a written plan. These apply as well, and are discussed below.

When the full standard applies

A second set of duties, assessment and control measures, applies when any of four conditions exists: the temperature reaches 87 degrees when employees are present; the heat index reaches 87 degrees; employees wear clothing that restricts heat removal and the temperature reaches 82 degrees; or employees work in a high radiant heat area and the temperature reaches 82 degrees.

That last condition matters for kitchens. A “high radiant heat area” is a work area where the globe temperature is at least five degrees Fahrenheit greater than the air temperature. Ranges, ovens, grills, salamanders, pizza ovens, and fryers are classic radiant heat sources, and the regulation’s definition of radiant heat expressly includes hot objects, hot liquids, hot surfaces, and fire. A cook working in front of a wood-fired oven may trigger the full standard at 82 degrees rather than 87.

Measuring and recording heat

Where the full standard applies, the employer must measure the temperature and heat index and record whichever is greater, and identify and evaluate other environmental risk factors. Records must include the date, time, and specific location of each measurement.

Initial measurements are taken when it is reasonable to suspect the full standard applies, at the times of greatest exposure. New measurements are required when conditions are reasonably expected to be 10 degrees or more above the previous measurements. Records are kept for 12 months or until the next measurements, whichever is later, and must be available to employees, their representatives, and Cal/OSHA.

The rule also requires effective procedures to involve employees and their union representatives in planning and recording measurements.

An employer may skip measurement and simply assume the full standard applies, as long as it then implements the required control measures.

Controls, in the order the rule requires

The regulation sets a hierarchy.

Engineering controls come first. Employers must use them to reduce and maintain both temperature and heat index below 87 degrees, or below 82 degrees where employees wear restrictive clothing or work in high radiant heat areas, except to the extent the employer demonstrates such controls are infeasible. The regulation’s examples include isolating hot processes, air conditioning, cooling fans, evaporative coolers, local exhaust ventilation, shielding from radiant heat sources, and insulating hot surfaces. For a kitchen, that may mean servicing the hood so it actually pulls heat, adding spot cooling at the line, or shielding a station from the oven.

Administrative controls come next. Where engineering controls are not enough, employers must use administrative controls such as acclimatization, rotating employees, scheduling work earlier or later, work-rest schedules, reducing work intensity, and using relief workers. In a restaurant, prep that requires the ovens can move to the morning, and the hottest station can rotate every hour during a heat wave.

Personal heat-protective equipment comes last. Cooling vests and similar equipment are required where the first two levels are not sufficient.

Emergency response in a busy kitchen

The standard requires effective emergency procedures: reliable communication so workers can reach a supervisor or emergency services, a plan for responding to signs and symptoms, and clear directions to the worksite for responders.

If a supervisor observes or an employee reports signs of heat illness, the supervisor must take immediate action. Signs of severe heat illness, such as decreased consciousness, staggering, vomiting, disorientation, irrational behavior, or convulsions, require activating emergency procedures. An employee showing symptoms must not be left alone or sent home without being offered first aid or emergency medical services.

Acclimatization and the new hire

Under the standard, an employee newly assigned to a work area at or above 87 degrees, or at or above 82 degrees with restrictive clothing or high radiant heat, must be closely observed by a supervisor or designee for the first 14 days. Where no effective engineering controls address outdoor heat, all employees must be closely observed during a heat wave, which the regulation defines as a day with a predicted high of at least 80 degrees and at least ten degrees above the average high of the preceding five days.

Training cooks and supervisors

Every supervisory and non-supervisory employee must receive effective training before beginning work reasonably anticipated to involve heat risk. Topics include environmental and personal risk factors, the employer’s procedures, the importance of frequent small amounts of water, up to four cups per hour, acclimatization, types and symptoms of heat illness, reporting symptoms, and emergency procedures.

Supervisors receive additional training on implementing the plan, responding to symptoms, and, where outdoor temperatures affect the work area, monitoring weather reports. Many restaurants already keep training logs for other programs; our guide to employee training records in hospitality covers keeping those documents organized and appropriately private.

The written plan

Employers must establish, implement, and maintain an effective written Heat Illness Prevention Plan in English and in the language understood by the majority of employees. It must be available at the worksite. The plan can sit inside the Injury and Illness Prevention Program, combine with an outdoor heat plan, or stand alone.

At minimum, it must cover water, cool-down areas, measurement and control procedures, emergency response, and acclimatization. Restaurants that built a workplace violence prevention plan in 2024 already know the drill, as discussed in our guide to workplace violence prevention plans: a plan only counts if it describes what really happens in your building.

A practical summer checklist

• Put a thermometer at the hottest station and take readings during a weekend dinner rush.
• Decide whether you will measure or assume the full standard applies.
• Get the hood and exhaust serviced before the first heat wave.
• Identify a cool-down area under 82 degrees near the kitchen and tell everyone they may use it.
• Stock cool water at the line and in the dish area.
• Pair new hires with an experienced cook for their first 14 days in hot areas.
• Write a rotation schedule for the hottest stations on heat wave days.
• Train every cook and supervisor, and log the training.
• Post emergency directions near the phone so anyone can guide paramedics.

Current context as of November 8, 2026

As of this update, section 3396 remains in the California Code of Regulations as published on Cal/OSHA’s Title 8 page, with the same 82- and 87-degree thresholds described above. The regulation’s credit line still shows it was filed and became operative July 23, 2024. Employers should check the Cal/OSHA page directly before relying on any specific requirement, since standards can be amended.

The bottom line

A commercial kitchen is exactly the kind of workplace California’s indoor heat rule was written for. Measure the heat, fix what can be fixed, rotate people when it cannot, give cooks water and a cool place to rest, and make sure every supervisor knows that a cook in trouble is never sent home alone.

Sources

1. Cal/OSHA: Title 8, Section 3396, Heat Illness Prevention in Indoor Places of Employment
2. DIR: California indoor heat protections approved and go into effect (July 24, 2024)

This article is general information, not legal advice.