Heat Stress Policy Update: Where States Stand in 2026

As extreme heat events become more frequent and intense, heat illness prevention has shifted from a seasonal concern to a year-round policy priority. Across the United States, states are taking different approaches to protect workers from dangerous heat exposure — ranging from enforceable standards to active rulemaking to executive-level initiatives.

Here's where things stand in early 2026.

States with Enforceable Heat Standards

Several state OSHA programs already have formal, enforceable heat illness prevention standards in place.

California remains the national leader. Cal/OSHA enforces outdoor heat illness prevention requirements and has expanded protections to include indoor workplaces. Employers must provide water, shade or cool-down areas, training, written prevention plans, and high-heat procedures triggered at specific temperature thresholds.

Colorado also enforces a Heat Illness Prevention rule requiring employers to implement written heat safety programs, provide water and rest, conduct training, and take protective measures once temperature thresholds are reached.

Washington and Oregon also maintain enforceable standards requiring employers to implement protective measures when temperatures reach certain trigger points. These include rest breaks, access to water, training, and monitoring requirements.

Minnesota has long maintained indoor heat stress protections under its state OSHA program.

Nevada and Maryland have adopted newer heat regulations requiring written heat illness prevention programs, exposure assessment, and worker training.

These state-plan OSHA programs function as enforceable regulatory frameworks — meaning noncompliance can result in citations and penalties.

States Actively in Rulemaking

Several states are moving beyond guidance and toward formal regulatory adoption.

New Mexico

New Mexico has initiated formal rulemaking through the state's Occupational Health and Safety Bureau to adopt a Heat Illness and Injury Prevention rule. The proposal includes requirements for:

• Written heat safety plans
• Hazard assessment and monitoring
• Engineering and administrative controls
• Training and acclimatization procedures
• Recordkeeping requirements

Public comment periods and hearings have been part of the process, positioning New Mexico as one of the more proactive states in advancing toward a formal, enforceable heat rule.

If finalized, this would place New Mexico among the states with structured, regulatory heat illness prevention frameworks.

Executive and Enforcement-Based Approaches

Some states are advancing heat protections through executive directives and enforcement emphasis programs rather than full codified standards.

Arizona

Arizona has taken meaningful steps toward strengthening workplace heat safety. In May 2025, Governor Katie Hobbs issued an executive order directing state agencies to prioritize heat safety efforts and strengthen enforcement strategies.

Arizona's Division of Occupational Safety and Health (ADOSH) operates a Heat State Emphasis Program (SEP) focused on inspections and enforcement in high-risk industries during hot weather periods.

Additionally, the Governor established a Workplace Heat Safety Task Force, which released employer guidance and recommendations in late 2025. These include best practices on water, rest, shade, acclimatization, and training.

While Arizona does not yet have a codified heat standard with regulatory trigger thresholds like California, it has clearly elevated heat illness prevention through executive action, task force recommendations, and enforcement initiatives.

Legislative Activity Expanding Nationwide

Beyond states with standards or active rulemaking, legislative interest is growing rapidly.

During the 2025 legislative session, numerous states introduced heat-related workplace bills. Proposals have included:

• Mandatory rest and hydration requirements
• Written heat safety program mandates
• Training and acclimatization rules
• Worker notification requirements
• Expanded OSHA state-plan authority

States such as New York, Illinois, Colorado, and New Jersey have all seen active legislative discussions around workplace heat protections, even if bills have not yet been finalized.

This surge reflects growing recognition that heat is a workplace hazard requiring structured prevention — not simply voluntary guidance.

Federal Rulemaking: The Big Picture

At the federal level, OSHA's proposed Heat Injury and Illness Prevention rule remains under development following the 2024 Notice of Proposed Rulemaking and subsequent public hearings in 2025.

If finalized, the federal rule would apply to both indoor and outdoor workplaces nationwide and require:

• Written heat hazard plans
• Monitoring of environmental conditions
• Water and rest break protocols
• Acclimatization procedures
• Worker training
• Emergency response planning

Until a federal rule is finalized, OSHA continues enforcement through its National Emphasis Program on heat, which prioritizes inspections in high-risk sectors.

A Patchwork — But Momentum Is Clear

The current U.S. heat policy landscape can be grouped into three tiers:

1. Enforceable state standards (CA, CO, WA, OR, NV, MD, MN)
2. Active rulemaking toward formal standards (NM and others considering similar steps)
3. Executive and enforcement-based approaches (AZ and other states increasing oversight)

While approaches differ, one theme is consistent: heat is now widely recognized as a preventable occupational hazard that requires structured mitigation.

As temperatures continue to rise across many regions, states are no longer debating whether heat is a workplace risk — they are debating how best to regulate it.

For employers, the takeaway is clear: proactive heat illness prevention planning is no longer optional. Even in states without formal standards, enforcement emphasis, executive guidance, and pending rulemaking signal a regulatory direction that is unlikely to reverse.

Heat policy in the United States is evolving — and the trajectory points toward greater accountability, structured prevention programs, and stronger worker protections nationwide.