What does OSHA currently require for workplace heat?

Short answer: There is no final federal OSHA heat standard yet. What is enforceable today is the OSH Act's General Duty Clause — Section 5(a)(1), which requires employers to address recognized hazards likely to cause death or serious harm, and heat is a textbook recognized hazard — backed by existing standards on potable water, first aid, and recordkeeping, and driven in the field by OSHA's revised National Emphasis Program on heat (updated April 10, 2026). A dedicated heat standard was proposed on August 30, 2024 and remains in rulemaking: its provisions are not law.

OSHA workplace heat requirements: what employers must do now (2026)

Workplace heat sits in an unusual legal position: it kills workers every year, OSHA inspects for it aggressively, and yet the specific federal standard is still working through rulemaking. That gap confuses employers in both directions — some assume "no standard" means "no obligation," and others read the proposed rule's numbers as if they were already enforceable. Both are wrong, and both get people hurt or cited. This guide is written for the safety manager, HR lead, or owner who needs the current-law picture straight: what federal OSHA can and does enforce on heat today, what the revised 2026 National Emphasis Program changes about inspections, exactly where the proposed heat standard stands, and the program elements OSHA and NIOSH expect a reasonable employer to run right now.

Why this matters.
OSHA cites heat cases under the General Duty Clause, Section 5(a)(1) of the OSH Act today — no heat-specific standard is needed to issue a citation. And on April 10, 2026 OSHA updated its National Emphasis Program on outdoor and indoor heat, directing inspections to 55 high-risk industries identified from 2022–2025 injury and citation data and authorizing random heat inspections on National Weather Service heat-advisory days. Employers waiting for a final standard before building a heat program are already inside OSHA's enforcement window.

The enforceable framework: what OSHA can cite today

Federal OSHA's current heat enforcement rests on four legal legs, none of which is a heat-specific standard:

• The General Duty Clause — Section 5(a)(1). The OSH Act requires every employer to furnish employment "free from recognized hazards that are causing or are likely to cause death or serious physical harm." Heat is a recognized hazard with decades of documentation, so an employer who exposes crews to hazardous heat without feasible controls — water, rest, shade or cooling, acclimatization, training, an emergency plan — can be cited without OSHA pointing to any heat standard at all. This is how federal heat citations are written today.
• Potable water. Existing sanitation standards — 1910.141 in general industry and its construction and agriculture counterparts — already require employers to provide potable drinking water. In a heat case, failing to supply accessible water is both its own violation and evidence for the 5(a)(1) case.
• Medical services and first aid. 1910.151 and 1926.50 require first-aid readiness — which for heat means people and supplies positioned to cool a stricken worker and summon help. The site-level detail lives in our OSHA first aid kit requirements guide.
• Recordkeeping. Heat illnesses that meet the criteria in 29 CFR 1904 — days away, medical treatment beyond first aid, loss of consciousness — are recordable, and heat-related hospitalizations and fatalities carry the same reporting clocks as any other cause.

The 2026 National Emphasis Program: how inspections actually arrive

The enforcement engine is the National Emphasis Program on Outdoor and Indoor Heat-Related Hazards, first issued in April 2022 and reissued in revised form on April 10, 2026 — effective immediately, for five years. The revision matters operationally:

The practical read: an inspection can begin as a fall-protection or amputation visit and expand into heat the moment the officer sees crews working hot without controls. On advisory days, no complaint is needed at all.

The proposed heat standard: exactly where it stands

OSHA published its proposed rule — Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings — in the Federal Register on August 30, 2024. Per OSHA's own rulemaking page, the initial comment period closed January 14, 2025; an informal public hearing ran June 16 through July 2, 2025; and the post-hearing comment period closed October 30, 2025. As of this guide's review date the agency is evaluating that record. The rule remains proposed — none of its provisions is enforceable federal law.

What the proposal would do, if finalized in its proposed form: require written heat injury and illness prevention plans, condition-triggered controls keyed to an initial heat trigger and a high heat trigger, drinking water, rest breaks, shade or cool-down areas, acclimatization protocols for new and returning workers, and training — across general industry, construction, maritime, and agriculture. Treat every one of those as a preview of likely obligations and a description of good practice, not as current requirements. When the final rule publishes, this page changes; until then, the General Duty Clause and the NEP are the law of the land.

What employers should be doing now

OSHA's inspection guidance and NIOSH's criteria describe the program a reasonable employer runs today. The table separates what is directly enforceable from what is recommended practice that also builds the 5(a)(1) defense:

State plans: where heat rules are already enforceable

About half the states run their own OSHA-approved plans, and several have adopted heat-specific standards that are enforceable law today — California's outdoor and indoor rules, Washington, Oregon, Minnesota's indoor rule, and others, with more in progress. These rules carry specific triggers, shade, water, rest, acclimatization, and written-plan requirements that go beyond current federal OSHA. This guide deliberately does not maintain a state-by-state table: if you operate in a state-plan state, the controlling text is the state's own standard, current from the OSHA State Plans directory and the state agency's heat pages. The federal floor described here never excuses less where a state requires more.

Worked example: bringing a landscaping crew up to current OSHA heat expectations

Here is the sequence for a 12-person landscaping operation entering summer, run against what federal OSHA enforces today rather than the proposed rule:

1. Assess the exposure. List the hot jobs — mowing in sun, paver work over radiant hardscape, trailer loading — and rate each task's workload. Note the two new hires and one worker returning from three weeks away, all of whom need ramped schedules.
2. Stage water and shade. Coolers of potable water on every truck at the work face, a pop-up canopy or shaded break spot at each site, and a stated drinking cadence — this is the enforceable core plus the heart of the 5(a)(1) defense.
3. Run the NIOSH ramps. New hires start near 20% of hot-work exposure and add about 20% per day; the returning worker runs 50%, 60%, 80%, 100% across four days. Document the schedule.
4. Equip against the load. Breathable hi-vis like the Ergodyne GloWear 8282 Class 2 hi-vis short sleeve safety shirt, and evaporative cooling from the Ergodyne Chill-Its 6665 evaporative cooling vest — the field routine that stitches gear, water, and breaks together is our how to work safely in extreme heat guide.
5. Train and assign the buddy system. A toolbox talk on symptoms and the don't-diagnose rule, buddy pairs on every crew, and supervisors who know the cool-first, call-911 response.
6. Watch the triggers. Check the forecast each morning; on advisory days — the same days the NEP authorizes random inspections — slow the schedule, tighten the break cadence, and log conditions with the heat stress calculator or an on-site measurement.

That program satisfies what OSHA enforces now, tracks the proposed rule's shape without pretending it is law, and — more to the point — is the program that keeps the crew off the fatality statistics.

Frequently asked questions

Does OSHA have a heat standard?

Not a final federal one. OSHA proposed a heat injury and illness prevention standard on August 30, 2024, and the rulemaking is still open — the post-hearing comment period closed October 30, 2025 and the agency is reviewing the record. Today, federal heat enforcement runs through the General Duty Clause and the revised National Emphasis Program, while several state plans enforce their own heat rules.

Is the 80°F heat trigger an OSHA law?

No. Trigger temperatures — an initial heat trigger and a high heat trigger — appear in OSHA's proposed rule, which is not in effect. No federal trigger temperature is enforceable today. Some state standards do carry their own enforceable triggers, which is a reason to check your state plan.

Can OSHA cite an employer for heat without a heat standard?

Yes — it does so routinely under Section 5(a)(1) of the OSH Act, the General Duty Clause. The elements are a recognized hazard (heat qualifies), employee exposure, likelihood of death or serious harm, and feasible abatement — water, rest, shade, acclimatization, and training being the feasible measures OSHA points to.

What is the heat National Emphasis Program?

An enforcement directive — CPL 03-00-024 — that concentrates OSHA inspections and outreach on heat. The revised version issued April 10, 2026 is effective for five years, targets 55 high-risk indoor and outdoor industries chosen from 2022–2025 data, expands any open inspection where heat hazards appear, and adds random heat inspections on National Weather Service advisory and warning days.

Does federal OSHA require water breaks in the heat?

Existing sanitation standards require potable drinking water, and OSHA's heat enforcement treats accessible cool water plus a real break cadence as core feasible abatement under the General Duty Clause. The specific break schedules in the proposed rule are not yet law — but an employer providing no scheduled water and rest in hazardous heat is exposed under 5(a)(1) today.

Is shade legally required on a federal jobsite?

No federal standard names shade — but a shaded or cooled recovery area is standard feasible abatement in General Duty Clause heat cases, and several state plans require shade outright at specific temperatures. Treat a real cool-down spot as an expectation now, not an option.

Is acclimatization an OSHA requirement?

Federally it is recommended practice with teeth: NIOSH publishes the schedules — new workers no more than about 20% of a hot shift on day one, increasing no more than about 20% per day; returning workers 50%, 60%, 80%, 100% — and unacclimatized new workers dominate heat fatality reports, which makes missing ramps a recurring feature of 5(a)(1) cases. The proposed rule would codify acclimatization protocols.

Does OSHA require a written heat illness prevention plan?

Not federally, not yet — the written-plan requirement is part of the proposed standard, and several state plans already require one. Writing the program down now costs little and is exactly what the NEP's program-evaluation appendix looks for during an inspection.

Does the heat NEP cover indoor workplaces?

Yes. The program's full name is the National Emphasis Program on Outdoor and Indoor Heat-Related Hazards, and the 55 targeted industries include indoor settings — warehousing, manufacturing, commercial kitchens — where radiant equipment and poor airflow drive the load. Indoor heat is measured, not guessed: see WBGT vs heat index.

Are heat illnesses OSHA-recordable?

Heat illnesses that involve days away from work, medical treatment beyond first aid, or loss of consciousness are recordable under 29 CFR 1904 like any other illness, and heat-related in-patient hospitalizations and fatalities carry the standard reporting deadlines. The site's log is also the first place an inspector looks for a pattern.

When will the federal heat rule be final?

No date exists. OSHA closed the post-hearing record on October 30, 2025 and is evaluating comments; a final standard would still need to clear internal and administrative review before publication. Planning on the current framework — General Duty Clause plus NEP plus state rules — is the only defensible posture.

Which states have their own heat standards?

California runs both outdoor and indoor heat standards, Washington, Oregon, and Minnesota (indoor) enforce their own rules, and other state plans have adopted or are adopting heat requirements. State rules carry specific enforceable triggers and written-plan duties that exceed the federal floor — verify yours through the OSHA State Plans directory and your state agency's current text.

What does OSHA expect for heat emergencies?

First-aid readiness under 1910.151 and 1926.50, plus a response that matches current OSHA first-aid guidance: cool the worker immediately, and call 911 when emergency signs — confusion, slurred speech, unconsciousness, seizure — appear, or whenever in doubt. The full symptom and response reference is heat exhaustion vs heat stroke.

Does OSHA require employers to measure temperature or WBGT?

No current federal standard mandates a measurement method. OSHA's hazard-assessment guidance recommends on-site WBGT measurement as the accurate approach, with heat index as a screening substitute — the difference, and when each is defensible, is decoded in WBGT vs heat index.

Does OSHA require cooling PPE like vests?

No standard names cooling PPE. It enters the picture as feasible abatement — especially where required clothing traps heat — and OSHA's guidance treats cooling gear as a supplement to water, rest, and shade, never a substitute. The equipment side lives in our best cooling gear guide and the cooling gear collection.

Who is most at risk while the rule is pending?

The data behind the NEP is unambiguous: new and returning workers in their first unacclimatized days, crews doing heavy work in sun or beside radiant equipment, and anyone working in heat-trapping PPE. That is why acclimatization ramps and the buddy system appear in every OSHA heat resource despite not being codified yet — the practice reference is how to work safely in extreme heat.

Further reading on this site

• How to work safely in extreme heat — the field routine: water cadence, work-rest cycles, acclimatization ramps, and cooling gear in practice.
• Heat exhaustion vs heat stroke — symptom recognition, first aid, and the when-to-call-911 rules this page's emergency expectations point to.
• WBGT vs heat index — the measurement side of the hazard assessment OSHA expects.
• Heat stress calculator — heat-index screening bands with water, rest, and shade actions.
• Cooling gear — vests, towels, and shades that reduce the load required clothing adds.
• OSHA first aid kit requirements — the first-aid readiness the heat emergency plan sits on.
• Facility safety checklist — where heat management fits in the quarterly walkthrough.