Heat illness prevention
Workplace Heat Safety in 2026: OSHA Requirements, State Rules & Prevention Plans
Extreme heat is a workplace hazard indoors as well as outdoors. Construction crews, roofers, agricultural workers, warehouse teams, delivery drivers, kitchen staff, manufacturing employees, and anyone wearing heat-retaining personal protective equipment may face serious heat-related risks.
Current federal position: OSHA has proposed a federal heat-specific standard, but it is not yet final. Employers remain responsible for protecting workers from recognized serious heat hazards under the General Duty Clause and any applicable OSHA standards or State Plan rules.
What employers must do now
Federal OSHA does not currently have one final, nationwide heat standard that sets the same requirements for every workplace. That does not mean employers can ignore heat hazards. OSHA treats hazardous heat as a recognized workplace risk and continues targeted enforcement through its National Emphasis Program for outdoor and indoor heat-related hazards.
The practical expectation is straightforward: evaluate the conditions, identify workers at risk, put feasible controls in place, and train employees and supervisors to recognize symptoms and respond promptly.
Outdoor heat risk
Direct sun, humidity, radiant heat from surfaces, limited shade, heavy physical work, and a new or returning worker can quickly increase heat strain.
Indoor heat risk
Warehouses, kitchens, laundries, foundries, manufacturing lines, boiler rooms, and poorly ventilated spaces can create dangerous heat exposure without outdoor temperatures being extreme.
Workload and equipment matter
Heavy physical work, hot machinery, limited airflow, and impermeable clothing or PPE can make the body work much harder to regulate temperature.
New workers need time to adapt
Workers returning after time away, beginning a hot-weather season, or moving into a more physically demanding role may need a structured acclimatization plan.
Build a practical heat-illness prevention plan
A useful plan is not just a weather alert. It should match the worksite, the physical demands of the task, the equipment and clothing used, the number of employees affected, and the ability to obtain prompt medical assistance.
Assess conditions before work begins
Consider heat index or Wet Bulb Globe Temperature (WBGT), direct sun, humidity, air movement, workload, radiant heat, and clothing or PPE. Do not rely on air temperature alone.
Provide water, rest, and cooling
Make drinking water readily available, schedule recovery breaks, and provide shade, air conditioning, fans, or another effective cooling area appropriate to the environment.
Acclimatize new and returning workers
Increase exposure gradually rather than assigning the most demanding work immediately. Supervisors should give extra attention to employees who have not recently worked in hot conditions.
Train workers and supervisors
Employees should understand heat hazards, early symptoms, preventive measures, reporting procedures, and how to obtain help. Supervisors need authority to pause or modify work when conditions become unsafe.
Plan for an emergency
Identify who calls emergency services, how responders reach the worksite, where the nearest cooling area is located, and how workers will be monitored while help is on the way.
Act quickly when heat illness is suspected
Confusion, fainting, seizures, loss of consciousness, hot or dry skin, or other severe symptoms may indicate a medical emergency. Call emergency services, move the worker to a cooler area where it is safe to do so, begin cooling measures, and do not leave the person alone.
State heat rules can add specific duties
Some OSHA State Plan jurisdictions have heat-specific requirements in addition to federal OSHA’s General Duty Clause. Rules can vary by industry, whether the work is indoors or outdoors, temperature or heat-index triggers, rest periods, shade, emergency planning, and documentation.
Check the rule that applies to your worksite: a state standard may be more specific than federal guidance. Review your State Plan requirements and contract obligations before relying on a general heat-safety policy.
Is a federal heat standard coming?
OSHA published a proposed Heat Injury and Illness Prevention Standard in 2024 for indoor and outdoor work. The public hearing and post-hearing process concluded in 2025, but the proposed rule has not become a final federal standard as of 2026.
Employers should not wait for a final rule before improving controls. Heat waves, hot indoor production areas, and physically demanding work can create immediate risk, and OSHA already recognizes hazardous heat as a workplace safety issue.
Support safer supervision
Strengthen safety awareness across the worksite
A formal heat-illness prevention plan must be tailored to the employer and worksite. Broader safety training can help supervisors and workers recognize heat hazards, coordinate controls, and respond more effectively when conditions change.
