Compliance Corner: Heat Illness Prevention Starts Before Summer

When we think about heat illness prevention, we think of taking action in the summer. We often picture outdoor crews working in the peak summer sun, laboring in triple digit heat. But from a compliance perspective, waiting until the summer means HR teams are acting too late.

Spring is when employers should proactively determine whether their policies, training, supervisory practices and day-to-day operations are effective at lowering heat-related risk. The Occupational Safety and Health Administration (OSHA) continues to emphasize that heat can pose a serious workplace hazard, and the agency’s proposed federal rule would apply to both indoor and outdoor work settings.

Heat illness prevention is both a summer safety issue and a readiness imperative. That distinction matters. Successful heat illness prevention measures are about taking reasonable, organized steps before conditions create unnecessary risk for employees and unnecessary exposure for the employer, rather than reacting when temperatures become extreme or an emergency occurs.

One of the most important misconceptions to address is the idea that heat risk is limited to outdoor work. Construction, landscaping and other field-based roles often come to mind, but OSHA specifically recognizes that hazardous heat exposure can occur indoors as well. Warehouses, kitchens, laundries, production environments and other hot indoor settings may create significant risk, especially when work is physically demanding or ventilation is constrained.

For employers, that means heat illness prevention should be treated as more than a seasonal prerogative. It may be relevant to any workplace where employees work in hot conditions, wear heat-retaining protective equipment, perform strenuous tasks or spend extended periods in environments with limited cooling.

Even though there is no final nationwide federal heat standard in place, employers can’t afford to take a wait-and-see approach. OSHA has already made clear that employers are expected to protect employees from recognized heat hazards, and the proposed rule only reinforces the agency’s broader direction.

Employers Should Think Proactively

Employers should start by identifying where heat-related risk is most likely to arise. That means looking beyond the weather forecast and asking practical questions about job duties, work environments, physical demands, protective gear, scheduling, airflow and recovery opportunities. A strong prevention effort begins with recognizing which roles, locations and tasks create elevated risk and when that risk is most likely to increase. OSHA’s planning guidance emphasizes the importance of evaluating job site conditions and preparing a heat illness prevention plan.

Employers should also confirm that basic preventive measures are not just available, but also clearly understood and consistently utilized. OSHA’s long-standing heat campaign has focused on practical elements such as water, rest, shade/cool-down opportunities, training and emergency response plans. Those concepts may sound simple, but they become compliance problems quickly when they are informal, inconsistent or left for individual managers to handle incidents instinctively.

For example, can supervisors:

• Clearly explain when an employee should take a recovery break.

• Ensure drinking water is easily accessible in the actual work area, not just theoretically available somewhere on site.

• Explain the process for responding when an employee reports dizziness, nausea, confusion or unusual fatigue.

If the answer depends on which department, location or supervisor is involved, that inconsistency must be addressed before warmer weather arrives. Inconsistency at the manager level can create serious safety risks and significant employer exposure.

Acclimatization Matters

Another issue employers should not overlook is acclimatization. New employees and returning employees are often at greater risk when they move into hot conditions too quickly. The National Institute for Occupational Safety and Health (NIOSH) recommends gradually increasing exposure over a 7- to 14-day period and closely observing newer workers during that window. OSHA similarly notes that workers who have not recently been exposed to hot environments may need shorter periods of exposure, more frequent breaks and closer monitoring until they build tolerance.

This is especially important for employers with seasonal shifts in temperature, physically demanding roles, temporary staffing or employees returning to work after an absence. A prevention plan that does not account for acclimatization may look adequate on paper while still leaving employees exposed in practice.

Supervisor Readiness is Critical

Supervisor readiness is another critical piece. A written policy has limited value if the people managing the work do not know how to spot early warning signs, when to adjust work practices or how to escalate a concern. OSHA specifically emphasizes worker and supervisor training as part of effective heat illness prevention.

From an HR perspective, this is often where compliance succeeds or fails. Supervisors make the real-time decisions that affect whether employees feel able to speak up, whether breaks are encouraged or discouraged, whether warning signs are taken seriously and whether a situation is handled early or allowed to escalate. A company may believe it has addressed heat safety because a policy exists in a binder or online portal. But if frontline leaders are not prepared to implement that policy consistently, the organization may have more exposure to risks than leadership realizes.

HR’s Role in Heat Illness Prevention

Heat illness prevention is an operational, health and safety issue, and HR has a meaningful role to play in supporting compliance and consistency across the organization. That can include reviewing policies, helping shape training, partnering with operations on communication, supporting documentation and reporting practices and ensuring expectations are clearly applied across departments and locations.

HR also brings a broader lens to the conversation. Compliance isn’t just about whether the company has a rule; it’s about whether the rule is workable, communicated, understood and reinforced in the day-to-day employee experience. In many organizations, HR is best positioned to spot the gap between written expectations and actual management practice.

The most proactive step HR can take is to create a written heat illness prevention plan that can serve as a valuable tool in every employer’s toolkit.

Here are a few ideas that employers may consider incorporating into their safety plans:

• Ensure cool, potable water is always available close to the work area

• Set water consumption guidance and offer water breaks every 20 minutes

• Offer electrolyte packets to employees

• Provide cooling towels and neck wraps

• Create dedicated shaded or cooled rest break areas

• Adjust work hours to account for heat, if possible

• Rotate employees on physically demanding tasks

The Cost of Inaction

From a compliance standpoint, employers can't afford to treat heat illness prevention as optional. The most obvious reason to proactively manage heat illness prevention is, of course, the health and well-being of your employees. Failing to address heat-related risk can not only lead to employee injury but also to OSHA or state-plan citations, monetary penalties, increased workers’ compensation costs, operational disruption and reputational harm.

OSHA has made clear that hazardous heat can be a recognized workplace hazard even before a final federal heat standard is adopted, and enforcement risk is even more direct in states with specific heat rules. Federal OSHA penalties can also be significant, with current maximum penalties reaching $16,550 per serious violation and $165,514 per willful or repeated violation. In practical terms, waiting until temperatures spike or an incident occurs can leave employers exposed on multiple fronts at once.

State Compliance Considerations

For multi-state employers, reviewing heat illness prevention plans becomes even more important. Several states have adopted more specific workplace heat requirements than the current federal baseline, including California, Oregon, Washington, Maryland and Nevada, with some states covering both indoor and outdoor work. California, for example, has existing outdoor heat illness prevention requirements and an indoor heat standard that took effect in 2024. Employers with operations in multiple jurisdictions should be careful not to assume that one general practice is enough everywhere.

The good news is that this is a highly actionable area of compliance. Employers do not need to wait for triple-digit temperatures or a final federal rule to start preparing. Now is an ideal time to review higher-risk roles, confirm that basic protections are in place, train supervisors and make sure the organization’s approach is operationally clear rather than merely well-intentioned.

Heat illness prevention is not just about reacting to summer. It is about entering the season prepared. For employers, that is good safety practice. From an HR compliance standpoint, it is also good management. And for employees, it can make all the difference.

California

• Coverage: Broad employer coverage under Cal/OSHA heat rules

• More Information: Cal/OSHA Heat Illness Prevention Guidance & Resources

Colorado

• Coverage: Sector-specific agricultural heat protections

• More Information: Colorado INFO #12C: Heat Protection

Maryland

• Coverage: Broad employer coverage under MOSH Heat Stress Standards

• More Information: Maryland MOSH Heat Stress

Minnesota

• Coverage: Existing Minnesota OSHA heat-stress standard

• More Information: MNOSHA Compliance: Heat Stress

Nevada

• Coverage: Broad heat illness regulation, with some scope limitations

• More Information: Nevada OSHA Heat Illness Prevention Guidance

Oregon

• Coverage: Broad employer coverage under Oregon OSHA heat illness prevention rules

• More Information: Oregon OSHA Heat Illness Prevention

Washington

• Coverage: Broad workplace rule for outdoor heat exposure

• More Information: Washington L&I Be Heat Smart/Outdoor Heat Safety

Want to make sure your workforce is prepared for rising temperatures? Connect with a dedicated isolved HR professional.

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