California's Heat Standard
California was the first state to adopt a comprehensive outdoor heat illness prevention standard. Title 8, Section 3395 of the California Code of Regulations applies to all outdoor workplaces when temperatures reach 80 degrees Fahrenheit or higher. The standard has been in effect since 2006 and has been strengthened multiple times.
Core Requirements
Water
Employers must provide fresh, pure, suitably cool drinking water at no cost to employees. It must be located as close as practicable to the work area. The standard requires a minimum of one quart per employee per hour for the entire shift. Water must be available before employees begin work and replenished throughout the day.
Shade
When temperatures exceed 80°F, shade structures must be available and large enough to accommodate the number of employees on rest breaks. Shade must be open to air or have ventilation. Employees must be allowed and encouraged to take preventive cool-down rest breaks in the shade for at least five minutes when they feel the need to cool down.
Rest
Employees taking a preventive cool-down rest break must be monitored and asked if they are experiencing symptoms of heat illness. If symptoms are present, appropriate first aid must be provided immediately. No employee should be ordered back to work until symptoms have abated.
High-Heat Procedures (95°F and Above)
When temperatures reach 95°F, additional requirements activate. Employers must ensure effective communication by voice, observation, or electronic means so employees can contact a supervisor. A pre-shift meeting must address high-heat procedures, water and shade locations, and emergency response. Employees must be observed for signs of heat illness through a mandatory buddy system or regular supervisory check-ins.
Acclimatization
New employees and employees returning from an absence of 14 or more days must be closely monitored for the first 14 days of work. The body requires time to adjust to working in heat. During this acclimatization period, supervisors must exercise additional vigilance and allow more frequent rest breaks.
Indoor Heat (SB 1167)
Senate Bill 1167 directed Cal/OSHA to develop indoor heat illness prevention standards. The indoor standard applies when indoor temperatures reach 82°F in workplaces where employees perform physical labor. Requirements mirror the outdoor standard: water, cool-down areas, acclimatization, and emergency response procedures. Affected industries include warehousing, manufacturing, commercial kitchens, and laundry facilities.
Enforcement
Heat illness citations are frequently classified as serious violations, carrying penalties of up to $25,000 per instance. In cases involving employee death, criminal prosecution of the employer is possible. Cal/OSHA conducts targeted heat enforcement campaigns during summer months, particularly in agriculture and construction.