Cal/OSHA Proposes Stricter Indoor Heat Illness Prevention Rule
California OSHA has proposed an Indoor Heat Illness Prevention standard that would require employers to take preventive measures when indoor temperatures reach 82°F, with additional requirements at 87°F. The proposed rule covers most indoor workplaces including warehouses, kitchens, and manufacturing.
Overview
Cal/OSHA already has an outdoor Heat Illness Prevention regulation. The proposed Indoor standard extends those protections to workers in covered indoor settings. California's warehouse workers, kitchen staff, and manufacturing workers face significant heat exposure — particularly in facilities without adequate climate control.
Proposed Requirements
Trigger Point: 82°F
When indoor temperatures reach 82°F (28°C):
- Cool-down areas must be maintained at or below 82°F
- Workers must be allowed and encouraged to take preventive cool-down rests
- Drinking water must be provided (cool, potable, 32–50°F)
- Pre-shift communication about heat hazards
Enhanced Requirements: 87°F
When indoor temperatures reach 87°F (31°C):
- All measures above, plus:
- Engineering controls must be implemented or infeasibility documented
- Observable symptoms monitoring program required
- High-heat procedures: buddy system or observation
- Emergency response procedures for heat illness
Exemptions
- Air-conditioned buildings maintained below 87°F at all times
- Incidental exposure (brief entry, under 15 minutes per hour)
Federal Standard Status
Federal OSHA's proposed heat standard is still navigating the rulemaking process. Cal/OSHA's standard is expected to be finalized ahead of the federal rule and will serve as a model for other states.
Who's Affected
California employers in: warehouses, fulfillment centers, restaurant kitchens, food processing, laundries, manufacturing facilities, and any indoor workplace that can reach these temperatures.
⚠️ This content is informational only and does not constitute legal advice. For compliance guidance specific to your workplace, consult a qualified EHS professional or attorney.