Every year, preventable workplace hazards lead to serious injuries, long-term illnesses, and costly operational disruptions. A worker handling a toxic chemical may wear gloves, goggles, and a respirator every day, yet still develop breathing problems after months of exposure. Situations like this often occur when businesses rely too heavily on personal protective equipment rather than on stronger hazard-control measures that address the source of the danger.
According to the U.S. Bureau of Labor Statistics, private industry employers reported 2.5 million nonfatal workplace injuries and illnesses in 2024, reinforcing the need for stronger hazard prevention and better workplace systems. Effective workplace safety depends on reducing risk before exposure, not simply reacting after an incident.
Stronger risk mitigation strategies focus on controlling hazards earlier through better planning, safer systems, and more reliable workplace controls rather than relying only on protective gear after exposure becomes possible.
This is where the safety hierarchy comes into play. A proactive safety approach prioritizes prevention, reduces incidents, and creates safer workplaces through better planning and stronger control methods.
In this blog, we will explain how the hierarchy of controls works, why it remains a core part of modern workplace safety programs, and how employers can use it to strengthen compliance and improve everyday operations.
What Is the Safety Hierarchy of Controls?
| The safety hierarchy, also known as the hierarchy of controls, is a structured approach that reduces workplace risks by prioritizing the most effective hazard-control measures. Instead of relying only on protective gear, this system focuses on removing or controlling hazards at their source to improve long-term safety outcomes.
The 5 levels of the ‘Hierarchy of Controls’ are:
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Each level is ranked based on control effectiveness, with higher-level controls offering greater protection than lower-level controls. Controls at the top of the hierarchy focus on removing or reducing hazards before workers are exposed, while lower-level controls help manage risk when stronger solutions are not practical.
This model supports stronger occupational safety standards by encouraging employers to prevent incidents before exposure occurs. PPE remains important, but understanding PPE limitations is critical. Safety glasses or respirators may reduce exposure, but they do not remove the actual source of danger.
Organizations that follow OSHA 1910 standards, the National Institute for Occupational Safety and Health (NIOSH) safety framework, and the ISO 45001 hierarchy often use this structure to improve regulatory compliance and reduce residual risk. It also aligns with principles found in ANSI Z10 standards, which emphasize prevention, leadership involvement, and continuous improvement.
A strong safety program begins with inherent safety design, where hazards are eliminated during planning rather than managed later. When combined with stronger operational controls and clearly defined safe work procedures, this creates long-term systemic safety improvements while building a stronger safety culture throughout the organization.
Before choosing a control method, many employers perform a Job Hazard Analysis (JHA), conduct a job safety assessment, and use a risk assessment matrix to evaluate severity, likelihood, and exposure. This helps determine the most practical and effective solution for reducing workplace hazards.
The Five Levels of the Safety Hierarchy of Controls
Understanding and applying the Hierarchy of Controls is important for both employers and employees. This framework is often visualized as an inverted pyramid, where the most effective controls, like elimination and substitution, sit at the top, and the least effective method, PPE, remains at the bottom as the final line of defense.
Elimination
Elimination removes a hazard so that it no longer exists in the workplace. This is the most effective way to prevent injuries and illnesses because it eliminates the source of the risk rather than trying to control or minimize exposure.
Examples of Elimination
- Automating hazardous tasks: Replacing manual handling of dangerous materials with robotic systems.
- Redesigning work processes: Changing production methods to eliminate toxic chemicals.
- Removing fall hazards: Designing workspaces so that elevated work is no longer required.
- Discontinuing dangerous equipment: Removing outdated machinery that poses a significant risk.
Challenges and Feasibility
Eliminating a hazard may require expensive equipment upgrades, redesigned workflows, or infrastructure changes. Some risks are inherent to the job, which makes complete removal difficult. Construction work, for example, will always involve heights and moving machinery.
Process changes may also affect productivity, and some industries may not have practical alternatives to hazardous materials or tasks.
When Is Elimination Practical?
Elimination is most effective during workplace design or process planning, where safety can be built in from the start. If a safer method can replace a hazardous one without reducing efficiency, it should be the first option considered.
Although it may involve higher upfront costs, elimination often leads to lower injury rates, reduced liability, and stronger long-term safety outcomes.
Substitution
Substitution involves replacing a hazardous material, process, or equipment with a safer alternative to reduce risk. Unlike elimination, which removes the hazard entirely, substitution allows the task to continue in a less dangerous manner.
Examples of Substitution
- Replacing toxic chemicals: Using water-based paints instead of solvent-based paints to reduce exposure to harmful fumes.
- Switching to safer equipment: Using electric forklifts instead of diesel-powered ones to eliminate exhaust emissions.
- Using less harmful cleaning agents: Replacing strong industrial solvents with biodegradable, non-toxic alternatives.
- Substituting manual processes with automation: Using power-assisted tools to reduce strain and repetitive motion injuries.
Considerations When Implementing Substitution
While substitution is a safer alternative, it must be carefully evaluated to ensure the new solution does not introduce unintended hazards. Consider the following factors:
- Effectiveness of the substitute: Ensure the new material or process maintains productivity, quality, and efficiency.
- Potential new hazards: Confirm that the substitute does not introduce any new health or safety risks.
- Cost and feasibility: Evaluate affordability, training needs, workflow changes, and regulatory requirements.
- Long-term safety benefits: Choose alternatives that improve long-term safety and reduce workplace incidents.
Best Practices for Implementing Substitution
Before making changes, conduct a thorough risk assessment and involve workers and safety professionals in the evaluation process. Monitor the new material or process to ensure it does not create unforeseen risks and confirm compliance with OSHA regulations and industry standards.
However, every alternative should be carefully tested and monitored to maintain workplace safety. If substitution is not viable, the next step in the hierarchy is engineering controls, which focus on isolating people from hazards.
Engineering Controls
Engineering controls involve physically modifying the workplace, equipment, or processes to isolate workers from hazards. Unlike elimination or substitution, which aim to remove hazards entirely, engineering controls focus on designing safety in the work environment to reduce exposure. Because they do not depend on human behavior, these solutions are often more reliable than administrative controls or personal protective equipment (PPE).
Examples of Engineering Controls
- Ventilation systems for airborne contaminants: Installing local exhaust ventilation (LEV) systems to capture and remove harmful fumes, dust, or vapors at the source. Using fume hoods in laboratories to prevent chemical exposure.
- Machine guarding to prevent injuries: Physical barriers or interlocking guards should be installed on machinery to prevent workers from contacting moving parts. Use light curtains or two-hand controls to prevent accidental activation of dangerous equipment.
- Soundproof enclosures for noise protection: Place loud machinery in soundproof booths or enclosures to reduce workers’ exposure to noise. Sound-absorbing panels should also be installed in manufacturing areas to minimize workplace noise.
- Ergonomic workstation design: Using adjustable workstations, anti-fatigue mats, and mechanical lifting aids to reduce strain injuries and redesigning assembly lines to minimize awkward postures and repetitive motions.
Effectiveness of Engineering Controls
Engineering controls are among the most effective safety measures because they reduce hazards at the source rather than relying on workers to follow procedures or wear protective equipment. However, implementing them requires careful planning and consideration of costs, feasibility, and maintenance.
When to Use Engineering Controls
- When elimination or substitution is not feasible due to operational constraints.
- When a hazard is persistent or widespread, a long-term solution is required.
- When reducing worker exposure at the source is the most practical approach.
If engineering controls are not possible, the next step in the hierarchy is administrative controls, which focus on modifying work procedures to reduce risks.
Administrative Controls
Administrative controls involve changing work policies, procedures, and practices to reduce exposure to hazards. Instead of removing the hazard, these controls modify how people work to minimize risk. They are often used when elimination, substitution, or engineering controls are not feasible or require additional support.
Examples of Administrative Controls
- Rotating workers to limit exposure time: Reduce time spent in hazardous environments by rotating shifts.
- Safety training programs and warning signage: Use training and clear labels to improve hazard awareness.
- Strict Lockout/Tagout (LOTO) procedures: Prevent accidental machine start-up during maintenance and repairs.
- Enforcing safe work practices: Establish clear procedures for hazardous tasks and regular safety discussions.
Limitations of Administrative Controls
- Dependence on human behavior: Administrative controls rely on workers consistently following rules and procedures.
- Need for monitoring and enforcement: Regular supervision is required to maintain effectiveness.
- Less effective than higher-level controls: They reduce exposure but do not remove the hazard itself.
When to Use Administrative Controls
- When elimination, substitution, or engineering controls are not feasible due to cost or operational limitations.
- As a secondary layer of protection to support higher-level safety measures.
- When hazards cannot be removed, exposure can be managed through better work practices.
While administrative controls play a crucial role in workplace safety, they should be combined with more effective hazard controls whenever possible. If risks remain, the final level of the safety hierarchy, Personal Protective Equipment (PPE), serves as the last line of defense.
Personal Protective Equipment (PPE)
Personal Protective Equipment (PPE) consists of safety gear worn by workers to minimize exposure to workplace hazards. Unlike other control methods that remove or reduce hazards, PPE acts as a barrier between the worker and the danger but does not eliminate the risk.
Examples of PPE
- Head Protection: Hard hats to protect against falling objects and head injuries.
- Eye and Face Protection: Safety glasses or face shields to guard against flying debris, chemicals, or radiation.
- Respiratory Protection: Respirators filter harmful air dust, fumes, or chemicals.
- Hand Protection: Gloves to prevent cuts, burns, or exposure to harmful substances.
- Hearing Protection: Earplugs or earmuffs to reduce exposure to excessive noise levels.
- Foot Protection: Steel-toed boots to protect against falling objects and puncture hazards.
Why PPE is the Least Preferred Control Method PPE is considered the last line of defense in the hierarchy of controls because it does not eliminate or reduce the hazard itself. Instead, it relies on workers correctly wearing and using the equipment to provide protection.
Unlike elimination or engineering controls, PPE only reduces exposure, meaning the risk still exists. Workers remain fully exposed to the hazard if PPE fails or is worn incorrectly. PPE may not be sufficiently protective in high-risk situations, such as working with toxic chemicals or extreme temperatures. Engineering controls or substitution are often necessary to reduce the hazard at its source.
When to Use PPE
- When no other controls are feasible, PPE is the only protection option.
- It is used alongside engineering or administrative controls as a secondary line of defense.
- When workers require temporary protection during emergencies or maintenance work.
Best Practices for PPE Use
- Train workers on proper PPE use, fit, and maintenance.
- Regularly inspect PPE to ensure it is in good condition.
- Provide PPE that fits properly and is comfortable to wear.
- Combine PPE with higher-level controls whenever possible for better protection.
While PPE is essential in many workplaces, it should never be the primary or only safety measure. Employers should always try to eliminate or control risks earlier before relying on PPE as a protective solution.
The Role of Workplace Safety Training in Hazard Control
Workplace safety training plays a major role in preventing accidents, reducing injuries, and improving long-term workplace safety. Even with strong hazard-control measures in place, employees need the right knowledge to recognize risks, follow safe work procedures, and respond correctly in emergencies.
Importance of Safety Training
Training helps employees understand how the hierarchy of controls applies to their daily work. It improves hazard awareness, supports safer decision-making, and ensures workers follow established safe work procedures correctly during daily operations and emergency situations.
Stronger hazard prevention also helps reduce workers’ compensation claims, downtime, compliance penalties, and long-term operational costs.
Major Benefits of Workplace Safety Training
- Improves hazard prevention by helping workers identify risks early
- Increases control effectiveness by ensuring safety systems are followed correctly
- Reduces residual risk through better awareness and faster incident reporting
- Supports stronger risk mitigation strategies across daily operations
- Creates long-term systemic safety improvements through a stronger safety culture
Expert Support for Better Safety Outcomes
Collaborating with Gallagher Bassett, Safe T Professionals helps businesses strengthen workplace safety through expert-led training and staffing solutions. Our onsite, in-person, and hybrid training programs provide practical knowledge and real-world applications that improve workforce readiness and support safer day-to-day operations.
When training is combined with strong workplace controls, businesses can reduce incidents, improve compliance, and create safer environments for every employee.
Protect Your Workforce and Upgrade Your Safety Protocols With Safe T Professionals
At Safe T Professionals, we are dedicated to elevating safety standards through our expert consulting and staffing services. By proactively addressing and preventing safety issues and equipping your workforce with the necessary knowledge and tools, we help create a safer work environment.
Effective implementation of the hierarchy of controls often requires expert-led training, staffing support, and practical workplace safety planning. Safe T Professionals helps organizations reduce incidents, improve workforce readiness through onsite, hybrid, and in-person safety programs, and ensure compliance with industry standards.
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Frequently Asked Questions
What is the purpose of the hierarchy of controls?
The purpose of the hierarchy of controls is to reduce workplace hazards by prioritizing the most effective prevention methods first. It helps employers control risks at the source, improve decision-making, and create safer work environments by strengthening long-term safety planning rather than relying solely on protective equipment.
How does the hierarchy of controls improve workplace safety?
The hierarchy of controls improves workplace safety by helping employers choose stronger, more reliable prevention methods rather than relying solely on protective gear. It supports better planning, fewer incidents, lower injury costs, and stronger long-term safety performance across daily operations.
When should employers use administrative controls?
Administrative controls are used when hazards cannot be fully removed through elimination, substitution, or engineering controls. They help reduce exposure through scheduling, training, supervision, warning signs, and clearly documented safe work procedures that guide employees during routine and high-risk tasks.
How does Job Hazard Analysis (JHA) support hazard control?
A Job Hazard Analysis (JHA) helps identify workplace risks before work begins by breaking tasks into steps and evaluating possible hazards at each stage. This allows employers to choose more effective hazard control measures, improve planning, and reduce residual risk before incidents occur.
Why are engineering controls more reliable than PPE?
Engineering controls are more reliable because they isolate workers from hazards by implementing physical barriers such as machine guards, ventilation systems, or enclosed workspaces. Unlike PPE, they do not depend entirely on worker behavior, which improves consistency and overall control effectiveness.