Seven states have specific outdoor heat illness regulations. Every other state enforces under federal OSHA's General Duty Clause. If your crew works outdoors, you need a written plan — in every state.
Cal/OSHA §3395, Oregon OAR 437-002-0156, and Washington WAC 296-62-095 are the most prescriptive heat illness standards in the country. But enforcement isn't limited to regulation states: in 2024, federal OSHA issued heat citations in Texas (47), Florida (38), and Georgia (22) — states with no specific heat standard — using the General Duty Clause. The citation trigger is a heat illness event without documented prevention measures. A written Heat Illness Prevention Plan is your defense in every jurisdiction.
These states have codified heat illness prevention standards with specific requirements for water, shade, rest, acclimatization, training, and written plans. Enforcement is proactive — inspectors conduct summer heat sweeps without waiting for an incident.
These states have no specific heat standard but have among the highest federal OSHA heat citation counts nationally. The General Duty Clause applies when any employee suffers a recognized hazard without documented prevention measures. A written HIPP provides the same protection in these states as a formal regulation state.
Heat illness is the most predictable occupational hazard in outdoor work. Water weighs eight pounds per gallon — crews dehydrate before feeling thirsty. Pressure washing involves sustained physical exertion on concrete and asphalt surfaces that can reach 160°F in summer sun. The mechanism of injury is well-understood, the prevention is straightforward, and OSHA enforcement follows the paper trail.
When an employee is hospitalized for heat stroke, the investigation question is not whether it was hot — it is whether you had a plan. Employers with written HIPPs who experience heat illness events face general violations averaging $3,200. Employers without written plans face serious violations averaging $14,800. The $29 Safety Pack or the free HIPP generator eliminates that gap.
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Get Compliance Pro →California (§3395), Oregon (OAR 437-002-0156), Washington (WAC 296-62-095), Nevada (NAC 618), Colorado (7 CCR 1101-1), Minnesota (Part 5205.0110), and Maryland (COMAR 09.12.32) have enacted specific heat illness prevention regulations. These seven states mandate written plans, shade access at specific temperature thresholds, rest periods, and acclimatization programs. All other states enforce under Federal OSHA's General Duty Clause.
No. Federal OSHA issued heat citations in Texas (47), Florida (38), Georgia (22), and Arizona (29) in 2024 — states with no specific heat standard. The General Duty Clause has no temperature threshold: if an employee is harmed by a recognized hazard (heat) and the employer lacked documented prevention measures, the citation follows. The average federal OSHA serious heat citation in 2024 was $14,800.
In California, Oregon, Washington, Nevada, Maryland, and several other states, a written HIPP is explicitly required by regulation. In all other states, a written plan is not technically required — but it is the primary document that determines citation severity when an incident occurs. Without a written plan, "serious" violations are nearly automatic. With one, "general" violations and abatement are more likely.
Enforcement typically follows one of three paths: (1) employee complaint, (2) hospitalization report (OSHA 800-number), or (3) random inspection during heat advisories. In all cases, inspectors check for water availability, shade access, training records, and written plans first. Companies with complete documentation typically receive lower penalties and faster abatement agreements than those without.