Heat Illness Prevention Plan 2026: OSHA’s New Rules Are Already Knocking

If your organization’s heat illness prevention plan still looks like the laminated poster from 2019, consider this your official warning shot. OSHA’s overhauled Heat National Emphasis Program under Directive CPL 03-00-024 is not a suggestion. It is a multi-year enforcement mandate expanding to 55+ high-risk industries, with compliance officers prioritizing inspections the moment a heat index crosses 80°F.

For EHS Directors and Operations leaders in construction, warehousing, and manufacturing, the era of seasonal heat checklists is officially over. Here is what has changed, what inspectors are looking for, and how to build a defensible, data-driven compliance program before the next heat spike puts you on their radar.

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