An inspector showing up at a warehouse during a heat wave is not investigating a complaint. Under OSHA's current heat enforcement program, a National Weather Service heat warning or advisory for the area 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 several manufacturing sectors, and running through 2031. OSHA can open a programmed inspection at a covered facility whenever the National Weather Service issues a heat warning or advisory for the area, independent of whether a complaint was ever filed. A separate mechanism applies any day the heat index reaches 80°F or higher: inspectors already on-site for an unrelated inspection are directed to ask whether a heat illness prevention program exists, and can expand that inspection if they find evidence of a heat hazard.
This shift means facilities can no longer treat heat safety documentation as something to assemble reactively after a complaint. Both triggers are environmental, not complaint-driven, which means any facility operating through a hot season is a candidate for inspection regardless of its history, whether through a weather-based inspection or a heat question that surfaces during an unrelated visit.
Two Ways an Inspection Can Start
| Trigger | What It Authorizes | Complaint Required? |
|---|---|---|
| National Weather Service heat warning or advisory | A new, standalone programmed inspection at a covered facility | No |
| Heat index of 80°F or higher (Heat Priority Day) | A heat-related question added to an inspection already underway for another reason | No, but only applies mid-inspection |
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
Written heat illness prevention plan
Specifies the heat index or temperature threshold triggering additional precautions, who monitors conditions, and what steps are taken as conditions escalate.
Water access documentation
Station locations, capacity relative to headcount and shift structure, and confirmation stations are sized for peak demand. How to Size a Bottleless Water System for a Warehouse or Manufacturing Facility covers the sizing methodology behind this documentation.
Acclimatization protocol
How new hires and workers returning after a week or more away are gradually introduced to heat over 7 to 14 days, with records showing the protocol was followed.
Training records
Dated attendance showing employees and supervisors were trained on heat illness signs, symptoms, and emergency response.
Incident records
Heat-related illness reports, near misses, and the corrective action taken, showing the plan responds to real conditions rather than existing 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, OSHA can open a programmed inspection at a covered facility whenever the National Weather Service issues a heat warning or advisory for the area, regardless of whether any complaint has been filed. Separately, heat index days of 80°F or higher can prompt heat-related questions during any other inspection already underway at a facility. Either way, 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 several manufacturing sectors. Facilities in these industries should treat heat safety documentation as an ongoing operational requirement, not a one-time compliance project.