Hierarchy of Risk Control

 

Hierarchy of Risk Control

What is the Hierarchy of Risk Control?

The Hierarchy of Risk Control is a system used in occupational health and safety to prioritize and select the most effective methods for minimizing or eliminating workplace risks. It ranks control measures from the most to the least effective.

The core principle is simple: The best way to control a risk is to eliminate it entirely. If that's not possible, you move down the hierarchy, using the next most effective type of control.

It is a foundational element of major safety standards worldwide, such as ISO 45001.

The Levels of the Hierarchy (From Most to Least Effective)

The hierarchy is typically visualized as an inverted pyramid, with the most effective controls at the top. The number of levels can vary slightly, but the concept remains the same. The most common model has six levels.

Here is a breakdown of each level, with examples:

1. Elimination (Most Effective)

This is the most effective control because it involves physically removing the hazard from the workplace.

· What it is: Changing the process or design so the hazard is no longer present.

· Examples:

  · Using cordless tools instead of electric tools with long cords to eliminate the trip/snag hazard and electrical risk.

  · Demolishing an old, unsafe structure instead of trying to work on it.

  · Stopping the use of a hazardous chemical altogether by changing the product's formula.

2. Substitution

If you cannot eliminate the hazard, the next best thing is to replace it with something less hazardous.

· What it is: Swapping a material, process, or equipment for a safer alternative.

· Examples:

  · Using a water-based paint instead of a solvent-based paint to reduce exposure to harmful vapors.

  · Replacing asbestos insulation with a safer synthetic fiber.

  · Using a less toxic cleaning agent.

3. Engineering Controls

These controls involve isolating people from the hazard through physical means. They are designed to be effective without relying on human behavior.

· What it is: Installing physical barriers, guards, or ventilation systems.

· Examples:

  · Installing machine guards on a press brake to prevent hands from entering the point of operation.

  · Using a fume hood in a laboratory to contain and remove hazardous gases.

  · Installing noise-dampening enclosures around loud machinery.

  · Adding fall protection systems like guardrails.

4. Administrative Controls

These controls change the way people work. They rely on procedures and human behavior, making them less reliable than higher-level controls.

· What it is: Implementing safe work procedures, training, and scheduling to reduce exposure.

· Examples:

  · Developing and enforcing standard operating procedures (SOPs).

  · Providing worker training and safety signs.

  · Implementing job rotation to reduce the time a worker is exposed to a repetitive task or hazard.

  · Scheduling hazardous work (e.g., maintenance) for times when fewer people are present.

5. Personal Protective Equipment (PPE) (Least Effective)

PPE is the last line of defense. It protects the individual worker when all other controls are not enough or are not feasible. It does not eliminate the hazard and its effectiveness depends on proper fit, use, and maintenance by the worker.

· What it is: Equipment worn by a worker to minimize exposure to specific hazards.

· Examples:

  · Safety glasses, hard hats, and steel-toed boots.

  · Respirators, gloves, and hearing protection.

  · High-visibility clothing and fall arrest harnesses.

Why is the Hierarchy So Important?

1. Prioritizes Effectiveness: It provides a logical framework to ensure you always seek the most reliable and robust solution first, rather than defaulting to easier but less effective measures like warnings or PPE.

2. Creates a Safer Workplace: By focusing on higher-level controls (Elimination, Substitution, Engineering), you create an inherently safer environment where the risk is designed out, rather than relying on perfect human behavior.

3. Legal and Regulatory Compliance: Following the hierarchy is a core requirement of most occupational health and safety regulations globally. It demonstrates due diligence.

4. Cost-Effective in the Long Run: While higher-level controls may have a higher upfront cost, they are often more cost-effective over time. They reduce the potential for accidents, workers' compensation claims, downtime, and insurance premiums.

Key Takeaway

Always start at the top of the hierarchy and work down. Your goal is to use the highest level of control that is reasonably practicable (technically feasible and proportionate to the risk). A comprehensive risk control plan will often involve a combination of controls from different levels.