Texas is the deadliest state in the country for construction heat fatalities. From 2011 to 2023, 25 construction workers died from heat — more than any other state. In 2024, six more died, and OSHA cited four Texas employers.
OSHA's federal Heat Illness Prevention Standard is in its final stages of rulemaking. Contractors who wait for the rule to publish before building their program will already be behind. Here's what you need to know — and what you need to do now.
What Is OSHA's Heat Standard and When Does It Take Effect?
OSHA published its Heat Illness Prevention proposed rule in August 2024. Public hearings concluded in mid-2025. The final rule is expected in late 2025 or early 2026, with a 150-day phase-in period for most employers.
Texas is a federal OSHA state — meaning the new standard applies to all construction employers here without exception.
The "I didn't know" defense is gone. OSHA has been enforcing heat hazards under the General Duty Clause for years. The new standard simply makes the requirements explicit, enforceable, and far harder to dispute.
The Two Trigger Temperatures Every Texas Contractor Must Know
The proposed rule establishes two heat index thresholds that activate specific obligations:
80°F — Initial Heat Trigger
- Provide cool drinking water (no warmer than 77°F) at no cost — at least 1 quart per worker per hour
- Ensure shaded or air-conditioned rest areas are accessible
- Allow and encourage workers to use them
90°F — High Heat Trigger
- Mandatory scheduled rest breaks in shade or cooling areas
- Implement a buddy system or direct supervisor monitoring
- Increased observation of new or returning workers during acclimatization
In Austin, the heat index reaches 90°F on average more than 100 days per year. For most of June, July, August, and September, Texas contractors are operating under High Heat Trigger conditions every single day.
The Six Required Elements of a Written Heat Illness Prevention Plan
Every covered employer must maintain a written, site-specific Heat Illness Prevention Plan. A generic template downloaded from the internet will not satisfy this requirement. OSHA inspectors will look for documentation that reflects the actual conditions of your specific site.
A compliant plan must address:
1. Site-specific hazard assessment
Which tasks, workers, and site areas create the highest heat exposure. Roofing, concrete work, and tasks near heat-generating equipment require specific controls.
2. Engineering and administrative controls
Shade structures, scheduling high-exertion work during cooler hours, equipment with air conditioning, job rotation — specify which controls apply to which tasks.
3. Water and rest procedures
Where water stations are located, how often breaks occur, and how compliance is documented. One cooler for 20 workers is not enough — document actual provisions.
4. Acclimatization protocol
New workers and workers returning from 14 or more days off must be acclimatized. Day 1 is capped at 20% of normal workload in heat. Workload increases incrementally over 7 to 14 days. Most heat fatalities occur in the first few days on a hot job. This section of your plan must be specific and enforced.
5. Emergency response procedures
Who calls 911, how to direct EMS to the right location on a large site, and what first aid is provided while waiting for help. Heat stroke is a medical emergency — confusion, stopping sweating, and slurred speech are signs to call immediately.
6. Heat Safety Coordinator designation
A trained individual responsible for monitoring heat conditions, enforcing rest and water requirements, watching for symptoms, and maintaining documentation.
The Heat Safety Coordinator: A New Required Role
The proposed rule requires employers to designate a Heat Safety Coordinator on each site. This does not have to be a dedicated employee — a foreman or superintendent can fill the role — but they must be trained and their responsibilities must be documented.
Daily coordinator responsibilities include:
- Monitoring the heat index before work begins and throughout the day
- Enforcing water and rest break schedules
- Observing new and acclimatizing workers closely
- Recognizing heat illness symptoms and initiating emergency response
- Logging conditions and any heat-related incidents or complaints
This role matters. OSHA will ask who your coordinator is, what they were doing, and what they documented on the day an incident occurs.
What Acclimatization Actually Requires
Acclimatization is the provision most contractors will underestimate — and the one most likely to result in a fatality.
Under the proposed rule:
- Day 1: no more than 20% of the worker's normal workload duration in heat
- Days 2–14: increase incrementally until full workload is reached
This applies to new hires and to any worker returning after 14 or more days away from heat exposure — including workers coming back from vacation, injury leave, or a period on an indoor project.
On a practical level, this means you cannot put a new subcontractor crew on full production in 100°F heat on their first day. Your subcontract agreements and project schedules need to account for this.
OSHA Penalties for Heat Violations
- Serious violation: up to $16,550 per citation
- Willful or repeated violation: up to $165,514 per citation
- Failure to abate: up to $16,550 per day beyond the abatement deadline
Following the 2024 Texas heat fatalities, OSHA citations against four employers ranged from under $5,000 to over $31,000. Those amounts will increase. Penalty levels adjust annually for inflation, and willful violations — where OSHA determines the employer knew the hazard existed and failed to address it — carry penalties an order of magnitude higher.
What Texas Contractors Should Do Right Now
The rule is not yet final. That is not a reason to wait — it is a reason to move now while you have time to do it right.
This week:
- Walk every active job site and identify heat exposure points by task and location
- Confirm who has access to water and shade, and whether it meets the expected requirements
- Identify who will serve as your Heat Safety Coordinator on each site
This month:
- Draft your written Heat Illness Prevention Plan — site-specific, not a template
- Train your Heat Safety Coordinator formally and document it
- Brief all supervisors on the 80°F and 90°F trigger requirements and what each requires of them
Before summer:
- Update your subcontractor agreements to pass through heat safety requirements
- Build acclimatization scheduling into your onboarding process for new crews
- Test your emergency response procedures — does your coordinator actually know how to direct EMS to the east side of a 40-acre site?
The Bottom Line
Construction workers make up 7% of the U.S. workforce but accounted for more than 32% of all heat-related workplace deaths in 2023. Texas leads the nation in those deaths. OSHA's new standard is designed to close the gap between what employers know they should do and what they are legally required to prove they did.
A compliant written Heat Illness Prevention Plan is not paperwork. It is the document OSHA will request the day a worker goes down.
Greenberg Safety helps Texas contractors build site-specific heat illness prevention programs that meet the 2026 standard — written plans, coordinator training, documentation systems, and site audits before summer begins.
Schedule a consultation or call (512) 585-7070 to get your heat program in place before the season starts.
Related reading: 2026 OSHA Heat Stress Standard — what changes for employers · Heat Safety Tips for Construction Workers · OSHA Heat Illness Prevention resources