Arizona has no state-specific heat illness standard. Federal OSHA enforces under the General Duty Clause §5(a)(1). Here is what that means for your crew and why a written HIPP is your primary defense.
Arizona has a state OSHA plan (ADOSH) but no specific heat illness standard. ADOSH enforces under General Duty Clause. Phoenix reaches 110°F+ routinely in summer. ADOSH cited 29 outdoor employers for heat violations in 2024. Heat deaths in Arizona are the highest per capita in the Southwest.
"The OSH Act's General Duty Clause requires employers to provide a workplace free from recognized hazards likely to cause death or serious physical harm. Extreme heat is a recognized hazard. Employers in Arizona are subject to citation when employees suffer heat illness without documented prevention measures." Federal OSHA §5(a)(1) — enforced by ADOSH
These six requirements form the core compliance framework. ADOSH inspectors verify each independently. Missing any single element is sufficient grounds for a citation — even if the other five are in place.
| Requirement | What's Required in Arizona |
|---|---|
| Water | Cool water at no cost; ADOSH guidance: 1 quart per hour minimum during extreme heat |
| Shade | Shade structure or vehicle with air conditioning; absence during ≥100°F events cited |
| Rest Breaks | Mandatory rest periods during peak heat (noon–4pm); frequency based on heat index |
| Acclimatization | Critical for Arizona: new employees must not be scheduled for full outdoor shifts during first week in summer |
| Training | Heat illness training required; Phoenix-area employers expected to cover extreme heat protocols |
| Written Plan | ADOSH strongly recommends written HIPP; used as primary compliance evidence |
ADOSH cited 29 Arizona outdoor employers for heat violations in 2024. A Scottsdale commercial cleaning contractor received a $6,500 citation in August 2024 for failure to provide acclimatization procedures and shade during a 113°F heat event.
Heat illness violations are among the most straightforward citations in OSHA enforcement: the standard is clear, the failure is visible (no shade, empty water jugs, no written plan), and the injury creates automatic scrutiny. Pressure washing contractors are a common target because outdoor work is inherently high-exposure and crew sizes are often small enough that written plans are overlooked.
A written Heat Illness Prevention Plan creates the paper trail that separates a correctable general violation from a serious or willful citation. In Arizona, employers with a written plan who experience a heat illness incident face substantially lower penalty exposure than those without one.
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Get Safety Pack →Arizona's ADOSH enforces under the General Duty Clause rather than a specific heat standard. However, ADOSH has published detailed guidance on heat illness prevention and routinely cites Arizona employers when employees suffer heat illness without documented WRS (water, rest, shade) programs.
Phoenix regularly reaches 110°F–115°F in July and August. ADOSH considers any outdoor work above 90°F heat index to require documented heat illness prevention measures. Above 103°F, the failure to have shade, cool water, and rest periods is typically the basis for a serious citation.
Pressure washing in Arizona involves direct sun exposure on concrete and pavement that can reach 170°F surface temperature, radiant heat from buildings, and physical exertion. Arizona also has lower humidity than Southeast states, causing rapid dehydration without the humidity-based warning signs workers recognize in other states.
ADOSH serious violations carry up to $7,000 per citation. ADOSH may also refer egregious cases to federal OSHA, where penalties reach $16,550 per serious violation and $165,514 per willful violation.
Other state heat illness guides: