Hazard vs Risk: What's the Difference?
Hazard vs Risk: What's the Difference?
Understanding the difference between hazard and risk is fundamental to effective risk assessment. While these terms are often used interchangeably, they have distinct meanings that matter for workplace safety.
The Key Difference
A hazard is something with the potential to cause harm.
Risk is the chance of that harm occurring.
Think of it this way:
- A hazard is what could hurt you
- Risk is how likely and how badly it could hurt you
What is a Hazard?
A hazard is any source or situation with potential to cause harm in terms of:
- Human injury or ill health
- Damage to property
- Damage to the environment
- A combination of these
Types of Hazards
| Type | Examples | |------|----------| | Physical | Machinery, electricity, noise, heights, slippery floors | | Chemical | Cleaning products, solvents, fumes, dusts | | Biological | Bacteria, viruses, fungi, parasites | | Ergonomic | Poor posture, repetitive movements, manual handling | | Psychosocial | Stress, bullying, violence, fatigue | | Environmental | Weather, lighting, temperature |
Hazard Examples
- A trailing cable across a walkway
- A bottle of bleach in a cleaning cupboard
- A noisy piece of machinery
- A heavy box on a high shelf
- A stressful deadline
Key point: A hazard exists even if no one is currently at risk from it. The trailing cable is a hazard whether someone is walking past or not.
What is Risk?
Risk is the combination of:
- Likelihood - How probable is the harm?
- Severity - How bad would the harm be?
Risk = Likelihood × Severity
A hazard becomes a risk when:
- Someone is exposed to it
- There's a possibility of harm occurring
- The potential harm has consequences
Risk Examples
| Hazard | Risk Factors | Risk Level | |--------|--------------|------------| | Trailing cable in empty room | No one walks there | Low | | Trailing cable in busy corridor | Many people pass | High | | Bleach in locked cupboard | No access | Low | | Bleach left open on desk | Contact likely | High | | Noisy machine (85dB) | Occasional exposure | Medium | | Noisy machine (100dB) | Daily exposure | High |
Hazard vs Risk: Practical Examples
Example 1: Electricity
Hazard: Electricity has the potential to cause electrocution, burns, or fire.
Risk:
- Low risk: Properly insulated wiring behind walls
- Medium risk: Extension leads in good condition
- High risk: Exposed wires in a wet area
Example 2: Working at Height
Hazard: Falling from height can cause serious injury or death.
Risk:
- Low risk: Working on a stable platform with guard rails
- Medium risk: Using a secured ladder for brief work
- High risk: Working on an unsecured roof edge
Example 3: Chemicals
Hazard: Cleaning chemicals can cause skin burns, respiratory issues, or poisoning.
Risk:
- Low risk: Chemicals in sealed containers in a locked store
- Medium risk: Diluted chemicals used with gloves
- High risk: Concentrated chemicals handled without PPE
Example 4: Manual Handling
Hazard: Lifting heavy objects can cause back injuries and muscle strain.
Risk:
- Low risk: Light boxes at waist height
- Medium risk: Occasional lifting of 15kg boxes
- High risk: Repeated lifting of 25kg boxes from floor level
Why the Distinction Matters
Understanding hazard vs risk is crucial because:
1. It Guides Control Measures
- Hazard identification tells you what could cause harm
- Risk assessment tells you where to focus your efforts
You can't eliminate every hazard, but you can reduce risks to acceptable levels.
2. It Helps Prioritise
Not all hazards need immediate action. Risk assessment helps you:
- Focus on high-risk situations first
- Allocate resources effectively
- Document your reasoning
3. It's Required by Law
The Management of Health and Safety at Work Regulations 1999 requires employers to:
- Identify hazards (Regulation 3)
- Assess the risks from those hazards
- Implement controls proportionate to the risk
The Risk Assessment Process
Step 1: Identify Hazards
Find what could cause harm:
- Walk around the workplace
- Ask employees
- Check manufacturer instructions
- Review accident records
Step 2: Assess the Risks
For each hazard:
- Who might be harmed?
- How likely is harm?
- How severe would it be?
- What controls exist?
Step 3: Control the Risks
Apply the hierarchy of controls:
- Eliminate the hazard
- Substitute with something safer
- Engineering controls
- Administrative controls
- PPE (last resort)
Step 4: Record and Review
- Document your findings
- Set review dates
- Update when circumstances change
Common Misconceptions
"If there's a hazard, there's always risk"
False. A hazard can exist with minimal or no risk if:
- No one is exposed to it
- Controls are effective
- The hazard is isolated
"Eliminating risk means eliminating hazards"
Partly true. The best way to eliminate risk is often to eliminate the hazard. But sometimes:
- Hazards can't be eliminated (e.g., working at height)
- Risks can be controlled to acceptable levels
- Residual risk remains even with controls
"All hazards need the same attention"
False. Focus on:
- High likelihood + high severity = Priority 1
- Low likelihood + low severity = Lower priority
Quick Reference Table
| Aspect | Hazard | Risk | |--------|--------|------| | Definition | Potential to cause harm | Chance of harm occurring | | Exists when | Source of harm is present | Exposure + possibility combine | | Measured by | Presence/absence | Likelihood × severity | | Controlled by | Elimination, substitution | Controls, procedures, PPE | | Example | A trailing cable | Someone tripping over it |
How to Use This in Risk Assessment
When completing your risk assessment:
- List hazards first - What could cause harm?
- Assess each for risk - Who, how likely, how bad?
- Rate the risk - High, medium, or low
- Add controls - What reduces the risk?
- Re-rate - What's the residual risk?
Example Assessment
| Hazard | Who at Risk | Likelihood | Severity | Risk Level | Controls | Residual Risk | |--------|-------------|------------|----------|------------|----------|---------------| | Trailing cable | Staff, visitors | Possible | Minor | Medium | Cable cover | Low | | Chemical splash | Cleaners | Unlikely | Moderate | Low | Gloves, goggles | Very Low | | Falling boxes | Warehouse staff | Possible | Major | High | Secure racking | Medium |
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Related Resources
- 5 Steps to Risk Assessment
- COSHH Assessment Guide
- Free Risk Assessment Templates
- Electrical Risk Assessment
Last updated: March 2024.