Heat illness prevention: what OSHA expects of employers

Heat is one of the deadliest workplace hazards in the United States, and OSHA has made it an enforcement priority. Even where there's no single federal heat standard yet, employers can be cited under the General Duty Clause for failing to protect workers from a recognized hazard — and several states run their own heat rules that go further.

Water, rest, shade — and acclimatization

The core of any heat plan is simple: accessible cool water, rest breaks, and shade or a cool-down area. The part employers most often miss is acclimatization — new and returning workers need to build up heat tolerance gradually over their first week, because a large share of heat deaths happen in the first days on the job.

State rules can be stricter

California, Oregon, Washington, and others have specific heat standards with temperature triggers for water, shade, breaks and monitoring. If you operate in a state-plan state, check its heat rule — it likely sets hard requirements the federal General Duty Clause leaves general.

Write it down and train

A short written heat illness prevention plan, worker and supervisor training on the warning signs, and a record of acclimatization for new starters are what turn “we tell them to drink water” into a defensible program.