The Fatal Four: Why the Same Four Hazards Keep Killing Construction Workers

Chris Fredette
1 day ago
4 min read

This is Part 1 of Construction Safety in Focus, TriCore Safety's National Safety Month series for June 2026. Each week this month we're covering the hazards, habits, and hard truths that define safety on construction sites today.

In 2024, 1,069 construction workers died on the job in the United States. That number has stayed stubbornly between 950 and 1,100 every year for the past decade. And every year, the same four hazard categories are responsible for the majority of those deaths.

OSHA calls them the Fatal Four: falls, struck-by incidents, electrocutions, and caught-in/between accidents. Together they account for roughly 65% of all construction fatalities. We have known about these four hazard categories for decades. We have standards, regulations, training programs, and equipment specifically designed to address them. And workers are still dying from them every single week.

The question worth asking isn't what these hazards are. The question is why they keep winning.

By the Numbers

1,069 construction fatalities in 2024
Construction accounts for 1 in 5 private-sector workplace deaths despite employing about 8% of the workforce
The Fatal Four are responsible for approximately 65% of all construction deaths
Fall protection (1926.501) is OSHA's single most cited construction standard, year after year
Firms with fewer than 10 workers account for 57% of all fatal construction injuries

1. Falls: The One That Never Goes Away

Falls from elevation account for roughly 38 to 39% of all construction fatalities, making them the single largest cause of death in the industry year after year. In 2024 alone, falls killed 389 construction workers.

What makes this number hard to accept is that fall protection is one of the most well-developed areas of construction safety. The equipment exists. The standards are clear. OSHA's fall protection standard (1926.501) is the single most cited construction regulation year after year, which tells you exactly where the gap is: not in the rules, but in the execution.

The majority of fatal falls happen from heights between 6 and 30 feet, not from the tops of skyscrapers. They happen on roofs, on scaffolding, off ladders, and at leading edges that crews have walked past a dozen times. Familiarity is the enemy. When workers see the same hazard every day without incident, they stop seeing it as a hazard.

2. Struck-By: The Second Biggest Killer

Struck-by incidents account for about 17% of construction fatalities. The category includes being hit by vehicles, swinging equipment, falling objects, and flying debris. Most struck-by deaths involve transport vehicles, which is why work zone safety and ground disturbance planning are so critical on active sites.

The piece that often gets overlooked in struck-by prevention is line of sight. Operators can't avoid what they can't see. Spotter protocols, equipment exclusion zones, and high-visibility PPE all address the same root problem: workers and moving equipment sharing space without a clear system for managing that interaction.

3. Electrocution: Still Killing Workers Who Know Better

Electrocution deaths in construction often happen to experienced workers, not new ones. Contact with overhead power lines, energized equipment, and improperly grounded tools are the most common causes. Lockout/tagout procedures and utility locates exist specifically to prevent these deaths, but they require consistent execution every time, not just when the job seems complicated enough to warrant it.

Complacency is the word that comes up in almost every electrocution incident investigation. The worker knew the hazard was there. They had done this task before. They made a judgment call that the risk was acceptable that day. The problem is that electricity doesn't negotiate.

4. Caught-In/Between: The Hardest to Survive

Caught-in/between incidents account for about 5.8% of construction fatalities but carry some of the highest injury severity. Trench collapses, equipment rollovers, and workers pulled into unguarded machinery all fall into this category. When these incidents happen, there is rarely time to respond.

Trench work is where this hazard gets the most attention, and for good reason. A trench collapse can bury a worker in seconds. OSHA's excavation standard requires protective systems for trenches deeper than five feet, but compliance is inconsistent, particularly on smaller sites and with smaller contractors who may not have a dedicated safety resource.

Why These Four Keep Winning

The Fatal Four persist not because we lack information about them, but because of three things that happen on job sites every day:

Schedule pressure that pushes crews to skip steps
Familiarity with hazards that breeds complacency
Safety programs that exist on paper but don't translate to consistent field behavior

The data doesn't change until the culture changes. And culture doesn't change because of a poster on the wall or an annual training. It changes when workers and supervisors at every level treat these four hazards with the same seriousness on day 200 of a project as they did on day one.

Key Takeaways

Falls, struck-by, electrocution, and caught-in/between account for 65% of construction deaths
The hazards are well-known. The gap is execution, not knowledge
Most fatal falls happen from 6 to 30 feet, not extreme heights
Complacency, schedule pressure, and paper-only safety programs are the real root causes
Culture change is the only thing that moves the number

This is Part 1 of the Construction Safety in Focus series. Next up: The Real Cost of a Recordable. Read the full series at tricoresafety.com/blog.