An inspector showing up at a warehouse during a heat wave is not investigating a complaint. Under OSHA's current heat enforcement program, the heat index reaching 80°F is grounds enough. The facilities in the strongest position when that happens are not the ones with the most polished written policy. They are the ones who can show, with documentation, that the policy is actually being followed.
What Changed in 2026
OSHA updated its National Emphasis Program on heat-related hazards on April 10, 2026, extending its scope to 55 covered industries, including warehousing and manufacturing, and running through 2031. Unannounced inspections are authorized once the heat index at a facility reaches 80°F, independent of whether a complaint was ever filed.
This shift means facilities can no longer treat heat safety documentation as something to assemble reactively after a complaint. The trigger is environmental, not complaint-driven, which means any facility operating through a hot season is a candidate for inspection regardless of its history.
What Inspectors Evaluate
The NEP evaluates whether an employer identified the heat hazard at their facility and implemented effective controls. That evaluation goes beyond confirming a written policy exists. Inspectors look for evidence the policy reflects what actually happens on the floor: water access that is genuinely reachable during work, not just present somewhere in the building, and documentation showing the plan has been operationalized rather than filed away.
Documentation to Have Ready
A written heat illness prevention plan that specifies the heat index or temperature threshold triggering additional precautions, who is responsible for monitoring conditions, and what steps are taken as conditions escalate.
Water access documentation covering station locations, capacity relative to headcount and shift structure, and confirmation that stations are sized for peak demand rather than a rough estimate. How to Size a Bottleless Water System for a Warehouse or Manufacturing Facility covers the sizing methodology that produces this kind of documentation as a natural byproduct.
An acclimatization protocol identifying how new hires and workers returning after an absence of a week or more are gradually introduced to heat conditions over 7 to 14 days, with records showing the protocol was followed for recent new hires.
Training records showing employees and supervisors were trained on recognizing heat illness signs, symptoms, and the appropriate emergency response, with dates and attendance documented.
Incident records, including any heat-related illness reports, near misses, and the corrective action taken in response, demonstrating the prevention plan responds to real conditions rather than existing purely on paper.
Where Facilities Fall Short
The most common gap is a policy that describes what should happen without operational evidence it does happen. A written plan stating water is available "near the work area" without documentation of where, how much, and whether it's been adequate during actual peak demand periods does not hold up as well as a plan backed by placement records and capacity calculations.
The second most common gap is the acclimatization protocol, frequently absent entirely even at facilities with otherwise solid water and shade provisions. New hires and returning workers face measurably higher heat illness risk during their first two weeks, and inspectors specifically look for evidence this population is handled deliberately, not folded into general onboarding without adjustment.
Building the Underlying Infrastructure
Documentation is easier to produce when the underlying hydration infrastructure was built around actual peak demand in the first place, rather than retrofitted to match a policy document. Water and ice systems sized for warehouse and manufacturing environments generate the placement and capacity data that supports inspection readiness as a natural part of the facility assessment process, rather than a separate documentation exercise.
The full compliance and hydration framework for warehouse and manufacturing environments is covered in Warehouse Hydration and Heat Safety: The Complete Business Guide.
Talk to our team about heat safety compliance for your facility.
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Frequently Asked Questions
Can OSHA inspect a facility without a prior complaint?
Yes. Under the 2026 update to the heat National Emphasis Program, unannounced inspections are authorized whenever the heat index at a covered facility reaches 80°F, regardless of whether any complaint has been filed. The trigger is environmental, not complaint-based.
What is the single most important document to have ready for a heat inspection?
No single document covers the full requirement, but the water access documentation, placement, capacity relative to headcount, and evidence it was sized for peak demand, tends to be the piece inspectors scrutinize most closely, since water access is the most direct, verifiable control an employer can implement.
Why do acclimatization protocols matter so much to inspectors?
New workers and those returning after a week or more away face substantially higher heat illness risk during their first several days, and this population's risk is well documented in heat illness research. Facilities without a documented acclimatization protocol are missing a control inspectors specifically look for, even when other provisions like water and shade are adequate.
How long does OSHA's current heat enforcement program run?
The National Emphasis Program updated April 10, 2026 runs through 2031, covering 55 industries including warehousing and manufacturing. Facilities in these industries should treat heat safety documentation as an ongoing operational requirement, not a one-time compliance project.