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Monday Safety

Heat Illness Prevention in California: What Cal/OSHA Actually Wants to See

3 min read

title: "Heat Illness Prevention in California: What Cal/OSHA Actually Wants to See" date: "2026-05-15" summary: "Cal/OSHA §3395 is one of the most-cited standards in the state. Here is what an inspector looks for — water, shade, training, and high-heat procedures — and where most contractors fall short." readingTime: "3 min read"

Cal/OSHA §3395 is not optional, and it is not seasonal. If you have one outdoor worker in California — landscapers, framers, roofers, masons, anyone — you need a written Heat Illness Prevention Program. And it has to live somewhere other than the back of your truck.

The standard is short. The citations are not. Here is what an inspector actually checks for when they roll up on a 92-degree day.

The four pillars

Every Heat Illness Prevention Program has to cover four things. Miss one and you are looking at a serious citation, typically $13,000+.

  • Water. One quart per employee per hour. Cool, fresh, accessible. "We have a hose" is not water access.
  • Shade. Up at 80°F. Enough for every employee on break, at one time, without touching each other. A pickup-truck bed is not shade.
  • Cool-down rest. Employees can request a preventative cool-down period any time they feel they need one. No questions, no retaliation.
  • High-heat procedures. At 95°F, supervisor observation, mandatory pre-shift meetings, and a buddy system kick in.

Acclimatization is where new hires die

Every documented heat fatality in California in the last decade involved a worker in their first 14 days on the job. Acclimatization is the period where their body adapts. Your program must include:

  • Close supervision of new employees for 14 days
  • Closer supervision when a heat wave hits a crew that has not seen high temps in a while
  • Documented training before they start outdoor work — not "we will get to it"

Training is not optional

Both supervisors and non-supervisory employees need documented heat training. Topics include risk factors, signs of heat illness, the company's procedures, importance of water and rest, and how to call 911 with directions to the job site. Keep the sign-off sheet. Inspectors ask for it.

The fix

Pull your plan. Read it. If it is more than a year old or does not match how your crews actually work, it is wrong. A current Heat Illness Prevention Program is the difference between a warning and a $25,000 repeat-violation citation.

— Guy