OSHA's national emphasis program on heat: what small employers must do

Last updated 2026-07-10

What is OSHA's National Emphasis Program on heat, and why does it exist?

A National Emphasis Program (NEP) is a temporary enforcement campaign OSHA runs when one hazard is widespread enough to justify inspections beyond the normal complaint queue. OSHA launched the heat NEP on April 8, 2022, through directive CPL 03-00-024 ^[1]. It applies to every industry and every employer size. That last part is what most small business owners miss.

The program exists because the numbers are bad. The Bureau of Labor Statistics counted 436 occupational heat fatalities between 2011 and 2019, and that figure almost certainly runs low, because heat often gets listed as a secondary cause on death certificates ^[2]. OSHA's own analysis found hundreds of thousands of workers at heat illness risk each year. An agency that normally waits for complaints decided waiting wasn't working.

Here's the part that trips people up. The NEP is not a permanent standard. OSHA has a rulemaking process running to create a standalone heat rule (it published an Advance Notice of Proposed Rulemaking in October 2021) ^[3], but that rule isn't final. Until it is, every heat citation runs through the General Duty Clause.

That matters in practice. General Duty citations force OSHA to prove the hazard was recognized, that feasible abatement existed, and that the hazard was likely to cause death or serious harm. That's a higher bar than pointing to a number in a regulation. So inspectors working this NEP are trained to build detailed case files, not quick tickets.

Which employers and worksites does the heat NEP actually cover?

Every industry sector is covered. Directive CPL 03-00-024 names 70 high-priority NAICS codes ^[1], mostly construction, agriculture, landscaping, postal services, warehousing, utilities, and manufacturing. But the directive also lets an inspector open an inspection outside those codes the moment they spot heat conditions. No industry is exempt.

For small employers, the common exposure points are:

• Outdoor construction and roofing
• Landscaping and grounds maintenance
• Agriculture (field and packing operations)
• Warehouses and distribution centers without air conditioning
• Commercial kitchens
• Laundries and dry-cleaning facilities

Headcount does not protect you. The small business exemptions that apply to certain OSHA rules don't apply to the General Duty Clause, and the NEP carves out nothing for firms under 10 employees. One outdoor worker on a 95°F day, one inspector driving past, and you're in scope ^[1].

State Plan states (the 22 states and territories that run their own OSHA programs) have to adopt an equivalent program within 6 months of a federal NEP, and nearly all did ^[4]. So in California, Washington, Virginia, or any other State Plan jurisdiction, you're under a parallel program with requirements that are at least equal and sometimes tougher. California's Heat Illness Prevention standard at 8 CCR 3395 predates the federal NEP and spells out water, shade, and rest schedules in far more detail ^[4].

What triggers an OSHA heat inspection at a small business?

Three things can put an inspector on your site under the heat NEP.

First, proactive inspections. When the National Weather Service issues a heat advisory, heat warning, or excessive heat watch for a county, OSHA area offices are directed to find worksites in high-priority NAICS codes in that area and schedule inspections, no complaint required ^[1]. This is the genuinely new behavior the NEP introduced. Before 2022, most heat enforcement was reactive.

Second, referrals and complaints. A worker complaint, a referral from another agency (a state labor department, say), or a local news story about a heat illness can each open a programmed inspection.

Third, fatality and severe injury reports. Under 29 CFR 1904.39, employers must report a work-related fatality within 8 hours and any inpatient hospitalization within 24 hours ^[5]. A heat-related hospitalization report almost always produces an inspection, and under the NEP, that inspection goes deep.

The 80°F heat index threshold lives in OSHA's inspector guidance: at or above 80°F, the agency treats conditions as potentially hazardous and inspection activity as appropriate ^[1]. That's a low bar. Most of the continental US clears it routinely from May through September.

What do OSHA inspectors look for during a heat NEP inspection?

The inspection maps to what OSHA calls the core elements of a heat illness prevention program. Inspectors are trained to find evidence, or the absence of it, in each of these areas.

Water. OSHA's training shorthand is "one quart per worker per hour" during heavy work in heat ^[6]. Inspectors ask where water is stored, how far workers walk to reach it, and whether it's actually cool.

Rest. Is there a scheduled break policy? Where do workers rest, and is there shade or cooling? OSHA guidance suggests at least a 5-minute rest in shade for every hour of heavy outdoor work in extreme conditions, though without a final standard this isn't a hard regulatory number.

Acclimatization. This is the element most small employers have never heard of, and the one that burns them hardest. New workers and workers returning after time off are physiologically more vulnerable during their first 7 to 14 days in the heat ^[6]. OSHA expects a written acclimatization plan that limits new-worker exposure and ramps up duration over that window. Inspectors ask supervisors and workers about it face to face.

Training. Workers and supervisors should be able to name heat illness symptoms, say who to call in an emergency, and describe the water and rest protocol. If they can't in an interview, the inspector writes it up as a deficiency ^[1].

Emergency response. Is there a plan for calling 911? Is anyone trained in first aid? Does the crew know where the nearest ER is? Under the General Duty Clause, missing emergency planning for a recognized hazard strengthens the citation.

Recordkeeping. Inspectors check OSHA 300 logs for heat-related illnesses ^[5]. Underreporting is its own violation. A heat exhaustion case that got first aid but never made the 300 log is a separate problem on top of the prevention failure.

Inspectors also run private employee interviews, away from management. If workers say they felt pressured to skip breaks or didn't know where the water was, that goes straight into the citation record.

How does OSHA cite heat violations without a specific heat standard?

This genuinely confuses small employers who expect a rule number on the citation. With no final heat standard, OSHA uses Section 5(a)(1) of the OSH Act, the General Duty Clause. It requires every employer to furnish "employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm to his employees" ^[7].

To make a General Duty case hold, OSHA has to establish four things: the employer failed to keep the workplace free of a hazard, the hazard was recognized (by the employer or the industry), the hazard was causing or likely to cause death or serious harm, and a feasible means of abatement existed.

Heat is easy to establish as a recognized hazard. Trade association materials, NIOSH publications, and the employer's own training records all show recognition. Abatement is easy too. Water, shade, and rest cost almost nothing. That combination is why heat cases under the General Duty Clause tend to stick.

Penalties run on the current civil structure. A Serious citation carries a maximum of $16,550 per violation (2024 rate, adjusted annually for inflation) ^[8]. A Willful or Repeat citation can hit $165,514 per violation ^[8]. For a small shop with thin margins, one heat fatality driving a willful citation can end the business.

What does a heat illness prevention program for a small employer actually need to include?

OSHA's guidance and the NIOSH criteria document (Publication 2016-106) together describe what a defensible program looks like ^[6]. You don't need a consultant to build one. You do need it in writing, and it has to describe your actual work, not generic filler.

At minimum, a small employer's program should contain:

1. A hazard assessment specific to your worksites and tasks, naming which jobs carry the highest exposure. 2. Engineering and administrative controls: shade structures, cool rest areas, heavy work scheduled before 10 AM or after 4 PM when possible, task rotation. 3. A water and rest policy with explicit frequencies and quantities. 4. An acclimatization protocol with a ramp-up schedule for new and returning workers. OSHA recommends limiting new workers to 20% of maximum heat exposure on day one and increasing by roughly 20% per day over 5 to 7 days in moderate conditions, up to 14 days in extreme heat ^[6]. 5. Training for workers and supervisors covering the symptoms of heat cramps, heat exhaustion, and heat stroke, and how to respond to each. 6. An emergency response procedure with the address of the nearest ER and a named person responsible for calling 911. 7. A monitoring procedure: who checks the heat index each morning, using what source (the National Weather Service tool is free), and which actions each response level triggers.

If you need to build this fast, SafetyFolio's safety program generator walks you through each component in about 15 minutes and outputs a program formatted for inspection. But the content above is what matters, however you assemble it.

One honest note on cost. Shade structures and cooling fans for a small crew run a few hundred dollars. Misting fans go for $150 to $500 each. A single heat stroke hospitalization averaged more than $19,000 in direct medical costs alone in a 2019 analysis published in the Journal of Occupational and Environmental Medicine ^[9]. The math isn't close.

What are the penalties for heat violations, and are there small business reductions?

Yes, OSHA's penalty structure adjusts for employer size, and small employers benefit real money from it. The reduction schedule works like this ^[8]:

Employer size (workers)	Penalty reduction
1 to 10	70% reduction
11 to 25	60% reduction
26 to 100	40% reduction
101 to 250	20% reduction
251 or more	No size reduction

Extra reductions come from good faith (10%) and a clean violation history (10%). These stack, though total reduction on a single citation can't exceed 95%.

So a serious citation at the $16,550 maximum, after a 70% size cut and a 10% good faith cut, lands around $3,970. That's still a hard hit for a five-person company, and a willful citation gets no good faith credit at all.

Here's the point that actually decides the number. Good faith credit requires documented evidence. An inspector won't hand you credit for a program you describe out loud. You need the written program, training records showing workers got instruction, and a monitoring log. Those three documents turn "we tried to be safe" into a defensible record.

Does the heat NEP apply differently in states with their own OSHA programs?

State Plan states must adopt an equivalent program within 6 months of a federal NEP, under the OSH Act ^[4]. All 22 State Plan states have done so, and several already ran heat rules that met or beat the federal NEP.

California is the clearest example. Cal/OSHA's Heat Illness Prevention standard (8 CCR 3395) predates the federal NEP by about 15 years and sets hard numbers: shade must be available at 80°F, and a "high heat" procedure kicks in at 95°F with a mandatory buddy system and more frequent communication ^[4]. California employers follow the underlying regulation, more than the NEP, and Cal/OSHA has historically enforced heat harder than federal OSHA.

Washington (L&I), Oregon, Minnesota, and others carry similar rules. In a State Plan state, look up your own state's heat requirements first, because they may be more detailed than the federal NEP. OSHA lists every plan on its State Plans page ^[4].

For employers crossing state lines (common for contractors and farm operations), comply with whichever standard is more protective at each job location. No single national rule resolves this yet. That gap is one reason OSHA's push toward a permanent standard matters.

What records should small employers keep to defend against a heat NEP inspection?

Documentation is your whole defense under a General Duty Clause citation. A speech about your safety culture means nothing while an inspector builds a written record. Keep these on hand.

First, your written heat illness prevention program. Dated, signed by ownership or management, and specific to your actual worksites. Generic boilerplate that doesn't match your operations can hurt you, because an inspector can use it to show you never took the hazard seriously.

Second, training records. Who got trained, when, and on what. A sign-in sheet with a short description of the topics is the floor. Video completion records count too. Anyone hired mid-season needs their own record.

Third, acclimatization logs for new workers. Hire or return dates, and hours worked in heat each day for the first two weeks. This is the record most small employers don't have, and inspectors know it.

Fourth, a daily monitoring log. The heat index at the worksite or nearest NWS station, the time you checked it, and any action taken. A spreadsheet or a paper form is fine. It shows you were watching conditions, not ignoring them.

Fifth, OSHA 300 and 301 records for any heat-related incident, even minor first aid ^[5]. Hiding a heat exhaustion event is worse than logging it.

If you've had an incident, document the corrective actions you took. OSHA looks hard at what changed afterward, and genuine corrective action influences both the severity classification and the final penalty.

For structured incident report documentation after any heat illness event, a consistent form matters as much as the content in it.

How should small employers prepare before a heat season starts?

The worst time to build your heat program is July, with an inspector in the parking lot. The window for prep is roughly February through April across most of the US, before temperatures climb.

A workable pre-season checklist:

Update the written program. Pull last year's version. Any incidents? Any job tasks change? Add the heat index thresholds that trigger each response level (for example: at 90 to 103°F, mandatory 10-minute breaks every hour; above 103°F, limit outdoor work to essential tasks).

Train before the first hot day. Not on it. Before it. Annual refreshers for returning workers, full training for new hires. Keep a dated sign-in record.

Check supplies. Water containers, cups, electrolyte packets (not required, but useful), cooling towels or misting fans. Set up shaded rest areas before anyone needs them.

Brief supervisors directly. Supervisors under production pressure are the single biggest risk factor for heat illness. They need to hear, out loud, that no production target justifies overriding a worker's request for a break. OSHA's enforcement history includes cases where supervisors discouraged workers from stopping and workers died. Those produce willful citations and personal liability.

Know your weather resources. NOAA's heat index tool and the NWS excessive heat outlooks are free. Find the nearest NWS station to your main worksite and make the morning check a habit.

If your workers also handle hazardous materials in hot conditions, folding your heat program into your hazard communication written program keeps documentation together and shows OSHA one coherent safety system instead of a pile of loose documents.

What's the current status of OSHA's permanent heat standard, and what should small employers expect?

OSHA published an Advance Notice of Proposed Rulemaking (ANPRM) for a heat standard in October 2021 ^[3]. An ANPRM is the earliest stage of rulemaking, a comment-gathering step before a formal proposed rule gets written. As of mid-2025, OSHA had not yet published a Notice of Proposed Rulemaking (NPRM), the next required step before a final rule.

Rulemaking timelines are long. Based on OSHA's history with other major standards, a final heat rule is plausibly 3 to 6 years out from the ANPRM, which puts the likely window somewhere in 2025 to 2028. A change in administration can pause or speed that up.

When a final rule lands, expect specific numeric thresholds for water, rest, shade, and acclimatization, close to what California already requires. It will almost certainly carry two triggers: an initial heat trigger around 80°F (matching current OSHA guidance) and a high heat trigger around 90°F with added requirements.

The practical read: build your program to California's 8 CCR 3395 today and you're very likely compliant with whatever federal rule eventually arrives. Cal/OSHA's requirements have been a de facto model for federal rulemaking. Not a guarantee, but a reasonable planning bet.

For now, the NEP and the General Duty Clause do the enforcing. The NEP is temporary by design (these programs typically run 3 to 5 years and can be renewed) ^[1]. Given how slow rulemaking moves, expect the NEP to stay active well into the permanent standard process.

Frequently asked questions

Does OSHA's heat NEP apply to employers with fewer than 10 employees?

Yes. The heat NEP has no small employer exemption. Any employer with workers exposed to heat hazards is in scope. Employers with 1 to 10 workers do get a 70% penalty reduction if cited, but that's a penalty adjustment, not protection from inspection or citation. The General Duty Clause applies to every employer covered by the OSH Act, regardless of size.

What heat index level triggers a proactive OSHA inspection under the NEP?

OSHA's NEP directive (CPL 03-00-024) sets an 80°F heat index as the threshold where inspectors can run proactive inspections at high-priority worksites. When the National Weather Service issues a heat advisory or warning, area offices are directed to schedule inspections in the affected counties without a complaint. That 80°F bar is low, covering most of the US from May through September.

Can OSHA cite my company for heat even if no one got hurt?

Yes. The General Duty Clause covers hazards "likely to cause" death or serious harm, not only ones that already have. An inspector who finds workers with no water, no shade, no training, and no acclimatization plan on a 95°F day can cite you even if everyone went home fine. The hazard itself is the violation, not the outcome.

What is acclimatization and why does OSHA care so much about it?

Acclimatization is how the body adapts to working in heat, which takes 7 to 14 days of gradual exposure. Workers who aren't acclimatized (new hires, workers back from a break, or workers suddenly moved to a hotter site) face much higher heat stroke risk. OSHA's guidance recommends limiting new workers to 20% of maximum heat exposure on day one and increasing gradually over the following days. Inspectors ask about it directly.

What industries are most targeted by the OSHA heat NEP?

NEP directive CPL 03-00-024 lists 70 high-priority NAICS codes. The industries showing up most in inspections and citations include outdoor construction, roofing, landscaping, agriculture (field and packing), warehousing and distribution, postal and delivery services, and utilities. Commercial kitchens and laundries are common targets too, because indoor heat can be as dangerous as the sun.

How much is an OSHA heat violation fine for a small business?

A serious violation has a maximum penalty of $16,550 (2024 rate, adjusted annually). Employers with 1 to 10 workers get a 70% size reduction, bringing that to roughly $4,965 before good-faith and history credits. A willful citation can reach $165,514 per violation with no size reduction near that level. The 10% good-faith reduction requires documented evidence: a written program, training records, and monitoring logs.

Do I need a written heat illness prevention program, or is verbal training enough?

Verbal training alone won't hold up as a General Duty Clause defense. Inspectors specifically look for a written program during heat NEP inspections, plus training records, acclimatization logs for new workers, and daily heat monitoring logs. A written program also anchors any good-faith penalty reduction. If you can't show the inspector documentation, good intentions don't move the citation.

How does the heat NEP interact with my state's existing heat rules?

State Plan states must adopt an equivalent program within 6 months of the federal NEP. Several states, California most notably (8 CCR 3395), already had heat rules that exceeded the NEP. In those states you follow the state rule, which is usually more prescriptive. If you work in a State Plan state, check with your state's OSHA program directly, because it may set numeric thresholds the federal NEP doesn't.

What is the difference between the heat NEP and OSHA's proposed permanent heat standard?

The NEP (CPL 03-00-024) is an enforcement directive telling inspectors to prioritize heat inspections and cite under the General Duty Clause. It has no numeric rules, only guidance. OSHA's proposed permanent standard (ANPRM published October 2021) would create a standalone regulation with specific thresholds and requirements. As of mid-2025, no final rule was published. The NEP is the current enforcement mechanism while rulemaking continues.

What should I do if OSHA shows up for a heat inspection?

Cooperate professionally. Ask to see the inspector's credentials and the reason for the inspection. You have the right to accompany the inspector on the walkaround. Have your written heat program, training records, acclimatization logs, and OSHA 300 log ready. Don't guess at answers; if you don't know, say so. Workers can speak privately with the inspector, so make sure no one on your team feels pressured to mislead.

Is water really required by law, or is it just a recommendation?

Under the General Duty Clause, failing to provide adequate water to workers in heat is a recognized hazard with an obvious, feasible control, which makes it citable. OSHA guidance uses one quart per worker per hour as a practical benchmark. In California, water is required outright by regulation at 8 CCR 3395. In every other state, OSHA can and does cite water deficiency under the General Duty Clause during NEP inspections.

Does the heat NEP cover indoor workers, like warehouse employees?

Yes. The NEP covers all workers exposed to heat, indoors or out. Warehouses, distribution centers, bakeries, commercial kitchens, and laundries all appear in NEP enforcement. Indoor spaces without air conditioning, or with heat-generating equipment, can hit heat index values as dangerous as direct sun. If your indoor workers sweat heavily on a regular basis, your facility is in scope.

How do I calculate the heat index for my worksite?

NOAA's National Weather Service provides a free heat index calculator at weather.gov. Input air temperature and relative humidity, and it returns the apparent temperature. For a daily log, the simplest approach is to check the NWS hourly forecast for the nearest station each morning and record the expected heat index peak. Some employers add a digital thermometer with a humidity sensor (under $30) at the worksite for a direct reading.

Sources

1. OSHA, Directive CPL 03-00-024, National Emphasis Program on Outdoor and Indoor Heat-Related Hazards: Heat NEP launched April 8, 2022; covers all industries; authorizes proactive inspections when heat index reaches 80°F; lists 70 high-priority NAICS codes
2. Bureau of Labor Statistics, Census of Fatal Occupational Injuries: 436 occupational heat fatalities reported between 2011 and 2019
3. OSHA, Advance Notice of Proposed Rulemaking on Heat Injury and Illness Prevention, Federal Register October 2021: OSHA published an ANPRM for a standalone heat standard in October 2021; final rule not yet published as of 2025
4. OSHA, State Plans overview and Cal/OSHA Heat Illness Prevention Standard 8 CCR 3395: State Plan states must adopt an equivalent program within 6 months of a federal NEP; California's 8 CCR 3395 requires shade at 80°F and high-heat procedures at 95°F
5. OSHA, Recordkeeping and Reporting Occupational Injuries and Illnesses, 29 CFR Part 1904: Employers must report fatalities within 8 hours and hospitalizations within 24 hours under 29 CFR 1904.39; heat illnesses are recordable events
6. NIOSH, Criteria for a Recommended Standard: Occupational Exposure to Heat and Hot Environments, Publication 2016-106: One quart of water per worker per hour guidance; acclimatization should start at 20% of maximum exposure on day one and ramp up over 7 to 14 days
7. Occupational Safety and Health Act of 1970, Section 5(a)(1), General Duty Clause: Section 5(a)(1) requires employment free from recognized hazards causing or likely to cause death or serious physical harm; this is the legal basis for all current heat citations
8. OSHA, Penalties page, current civil penalty amounts adjusted for inflation: Serious violation maximum $16,550; willful or repeat violation maximum $165,514 per violation (2024 rates); size reductions of 70% for employers with 1 to 10 workers
9. Journal of Occupational and Environmental Medicine, analysis of heat-related illness costs (2019): Direct medical costs of a heat stroke hospitalization averaged more than $19,000 in a 2019 analysis
10. OSHA, Heat Illness Prevention campaign resources and employer guidance: OSHA's water-rest-shade framework and heat illness prevention program elements described in enforcement and outreach materials