Heat illness prevention is one of the fastest-growing OSHA enforcement areas. Federal OSHA is finalizing a specific heat rule, but current enforcement is under the General Duty Clause. Meanwhile, six states have their own more prescriptive heat rules.
State-Specific Requirements You Must Address
- California — Title 8 §3395: written plan, acclimatization, shade at 80°F, water accessibility, cool-down rest, high-heat procedures at 95°F
- Oregon — OAR 437-002-0155: similar to California with some variations
- Washington — WAC 296-62-095: outdoor heat illness prevention rule
- Nevada — recent addition to state plan states with heat rules
- Colorado — SB 21-020 for agricultural workers, expanding
- Maryland — outdoor heat rule effective 2024
What Every Heat Plan Should Include
- Written policy signed by responsible person
- Water — accessibility, quantity (1 quart per hour per worker minimum)
- Rest — location, duration, frequency
- Shade — availability at threshold temperatures (80°F or 90°F depending on state)
- Acclimatization schedule for new and returning workers
- High-heat procedures (typically triggered at 95°F)
- Emergency response — recognizing heat illness, treatment, transport
- Training documentation
- Supervisor duties
Acclimatization — The Most Overlooked Element
New workers are 3-4x more likely to have heat illness in their first week. Workers returning after even one week away lose acclimatization. Every heat plan needs an acclimatization schedule — typically 20% work capacity day 1, increasing by 20% per day over 5 days.
What's In The Forbes Heat Illness Pack
- Federal OSHA heat illness prevention plan
- California Title 8 §3395 compliant plan
- Oregon, Washington, Nevada state variants
- Acclimatization tracking log
- Heat index-based work rest schedule
- High-heat procedure trigger
- Heat illness emergency response procedure
- Training documentation
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Frequently Asked Questions
Is there a federal OSHA heat standard?
Not yet. OSHA is finalizing a specific heat illness prevention rule as of 2026. Currently enforced under the General Duty Clause (Section 5(a)(1)). State plans (California, Oregon, Washington, Nevada, Colorado, Maryland) have their own heat rules that are more prescriptive.
At what temperature does OSHA require action?
Federal OSHA uses NIOSH heat index recommendations — moderate risk at 91-103°F, high at 103-115°F, very high at 115+°F. California triggers shade at 80°F, cool-down rest at any temperature, and high-heat procedures at 95°F. Know YOUR state's specific thresholds.
Do I need a written heat illness prevention plan?
In state-plan heat states (CA, OR, WA, NV, CO, MD), yes — required by state rule. In federal OSHA jurisdiction, written plan isn't explicitly required BUT demonstrating compliance with General Duty Clause requires written procedures. When OSHA's national rule finalizes, written plan will be required nationwide.
What's the acclimatization protocol?
New workers: 20% work capacity day 1, increasing 20% per day over 5 days. Workers returning after 7+ days away: same protocol. During heat waves (temperature spike above recent conditions), all workers need additional monitoring. Track this — most citations come from missing documentation.
What are the symptoms I need to train workers to recognize?
Heat cramps (muscle spasms, treat with rest + fluids + cooling). Heat exhaustion (heavy sweating, weakness, cold clammy skin — move to shade, cool compresses). Heat stroke (body temp 103°F+, hot dry skin, confusion — 911 emergency, aggressive cooling). Training must cover all three.
Does my heat plan need to name a supervisor?
Yes. State heat rules require designation of who's responsible for implementation. Supervisor training is separately required. Missing supervisor designation is a common citation.