Quick answer: A hazard is a source of potential harm — a chemical, a height, a live wire. A risk is the likelihood and severity of harm actually occurring from that hazard. You cannot manage risk without first identifying the hazard.
Last reviewed: June 2026 by the BlueSafe Technical Team. Reflects current Model WHS Act and Regulations.
| Hazard | Risk | |
|---|---|---|
| What it is | A source or situation with potential to cause harm | The likelihood and severity of harm occurring from a hazard |
| Does it depend on circumstances? | No — a hazard exists regardless of controls | Yes — risk changes with exposure, likelihood and consequences |
| Example 1 | Wet floor | High risk if no signage; low risk if mopped, dried and signed |
| Example 2 | Working at height | High risk on an unsecured scaffold; lower risk with edge protection and a harness |
| Example 3 | Corrosive chemical | High risk if handled without PPE; lower risk with gloves, eyewear and SDS followed |
| Managed by | Hazard identification | Risk assessment and the hierarchy of controls |
| WHS obligation | Identify all hazards | Assess and control the risks arising from each hazard |
Why This Distinction Matters
In Australian workplaces the words "hazard" and "risk" are often used interchangeably. On a safety form, in a toolbox talk, even in some procedures — the two terms get swapped around as if they mean the same thing.
They do not, and confusing them creates real problems.
If your team cannot tell the difference between a hazard and a risk, your risk assessments may be incomplete. Controls may be applied to the wrong things. Injuries that were foreseeable will not be foreseen.
Under the Work Health and Safety Act (Model WHS Act, adopted across most Australian states and territories), a PCBU has a duty to ensure health and safety so far as is reasonably practicable. That duty requires you to:
- Identify hazards that could give rise to risks.
- Assess the risks arising from those hazards.
- Eliminate or minimise those risks using the hierarchy of controls.
You cannot do step 2 or step 3 correctly without a clear understanding of step 1 — and you cannot do step 1 without knowing what a hazard actually is.
What Is a Hazard?
A hazard is anything that has the potential to cause harm. That potential exists regardless of whether harm actually occurs.
Hazards can be:
- Physical — heights, moving machinery, noise, extreme temperatures, manual handling loads.
- Chemical — acids, solvents, cleaning products, dusts, fumes.
- Biological — moulds, bacteria, sharps contaminated with bloodborne pathogens.
- Psychosocial — bullying, fatigue, excessive workload, traumatic incidents.
- Environmental — uneven ground, poor lighting, inadequate ventilation.
A wet floor is a hazard. A table saw is a hazard. A bottle of hydrochloric acid sitting on a shelf is a hazard — even if nobody touches it today.
The important point: the hazard does not go away when you add controls. You may reduce the risk it creates, but the hazard itself remains. A chemical is still a chemical after you put on gloves.
What Is a Risk?
A risk is the likelihood that a hazard will cause harm, combined with the severity of that harm.
Risk is not a fixed property of a hazard. It is a product of:
- How likely it is that someone will be exposed to the hazard.
- How likely it is that exposure will lead to harm.
- How serious the harm would be if it occurred.
Risk is what changes when you apply controls. Controls reduce risk — they do not remove the hazard.
A plain-English example
A height of 5 metres above the ground is a hazard.
The risk of falling from that height depends on:
- Is there edge protection? (reduces likelihood)
- Are workers wearing a harness and lanyard? (reduces severity)
- Is the surface slippery? (increases likelihood)
- Are workers carrying loads? (increases likelihood)
- How often is that area accessed? (affects exposure frequency)
The same 5-metre height carries a very different risk on a secured, well-lit scaffold with exclusion zones versus an unsecured edge accessed multiple times a day by workers carrying materials.
At-a-Glance: Worked Examples
The table below shows the same workplace hazard assessed at different risk levels depending on circumstances and controls in place.
| Hazard | Scenario A (Higher Risk) | Scenario B (Lower Risk) |
|---|---|---|
| Wet floor | No signage, high foot traffic, workers carrying boxes | Wet-floor sign placed, area cordoned off, mopped and dried promptly |
| Chemicals | Unlabelled container, no gloves or eyewear, no SDS available | Clearly labelled, stored correctly, PPE provided and worn, SDS on site |
| Working at height (4 m) | No edge protection, no harness, unsecured ladder | Scaffolding with guardrails, harness and anchor point, daily pre-use check |
| Manual handling | Heavy, awkward load, no training, floor level to overhead | Load split into smaller items, mechanical aid used, workers trained in technique |
| Electrical work | Live circuits, no isolation, no insulated tools | Lockout/tagout in place, tested dead, insulated tools used, competent person only |
Why the Distinction Matters for Risk Management and Controls
Understanding hazard versus risk shapes every step of your risk management process.
Hazard identification is the starting point. You must actively look for everything that could cause harm — physical inspections, consultation with workers, review of incident records. See hazard identification methods for a structured approach.
Risk assessment comes next. Once you have identified a hazard, you assess the risk it creates: how likely is harm, how severe would it be? This is where a risk matrix is a practical tool — it gives you a consistent way to rate and prioritise risks so you focus your controls on what matters most. See how to use a risk matrix for a step-by-step guide.
Control selection follows. The hierarchy of controls — elimination, substitution, isolation, engineering controls, administrative controls, PPE — is applied to reduce risk. Each control measure reduces either the likelihood of exposure, the severity of harm, or both. The hazard may remain, but the risk is brought to an acceptable level.
Review is ongoing. Risk ratings change when work conditions change — new workers, different tasks, altered environments, seasonal factors. A risk assessment is not a one-time document.
Common Mistakes to Avoid
Calling a risk a hazard. "The risk is that we are working at height" is a common phrasing on sites. The height is the hazard; the risk is the likelihood and consequence of a fall. Getting this right on paper helps you choose the right controls.
Thinking controls eliminate hazards. Guardrails do not remove the height. A dust mask does not remove the dust. Controls manage risk; they rarely remove the hazard entirely.
Assessing risk without considering actual exposure. A risk assessment must reflect real site conditions — the time workers spend near the hazard, the frequency of the task, the competency of those involved. A theoretical assessment that ignores these factors will give you an inaccurate risk rating.
Rating risk too low to avoid paperwork. Under-rating risk to avoid a SWMS or a more detailed assessment is a common but dangerous shortcut. If something goes wrong and your documented risk rating does not match the real conditions, it can work against you in an investigation.
Quick Reference: The WHS Process
- Identify the hazard — what could cause harm?
- Assess the risk — how likely is harm, and how serious would it be?
- Control the risk — apply the hierarchy of controls.
- Review — monitor controls and reassess if conditions change.
This four-step process sits at the heart of the Model WHS Act and all state-equivalent legislation. Keeping the distinction between hazard and risk clear at each step keeps your system legally sound and practically effective.
Related guides
- Hazard Identification Methods
- How to Use a Risk Matrix
- Hierarchy of Controls Explained
- SWMS vs JSA: Key Differences, Legal Requirements and When to Use Each
Frequently asked questions
What is the difference between a hazard and a risk?
A hazard is anything with the potential to cause harm — such as a chemical, a height, or moving machinery. A risk is the likelihood and severity of harm actually occurring from exposure to that hazard. Hazard is the source of potential harm; risk is the measure of that harm becoming reality.
Can something be a hazard but have a very low risk?
Yes. A hazard exists regardless of controls or likelihood. A bottle of cleaning chemical is always a hazard. If it is stored in a locked cabinet, labelled correctly, and rarely handled, the risk of harm is low — but the hazard itself has not disappeared.
Why does the hazard vs risk distinction matter legally?
Australian WHS laws require PCBUs to first identify hazards and then assess and control the risks arising from them. Confusing the two terms can lead to incomplete risk assessments, missing controls, and potential breaches of the duty to ensure health and safety so far as is reasonably practicable.
What is a worked example of hazard vs risk in a workplace?
Hazard: a wet floor in a warehouse aisle. Risk: the likelihood that a worker walking through that aisle will slip and suffer an injury, multiplied by the severity of that injury. A high-traffic area with no warning sign and workers carrying heavy loads represents a high risk from the same hazard compared with a low-traffic area where the floor has been dried and a wet-floor sign is in place.
How BlueSafe Helps
Knowing the difference between a hazard and a risk is the foundation of any effective WHS system — but turning that understanding into compliant documents, forms and procedures takes time most businesses do not have.
BlueSafe's online platform gives you ready-to-use risk assessments, SWMS templates, and hazard management tools built around Australian WHS requirements. Whether you need to complete a risk assessment for a specific task or build out a full WHS system for your business, the platform is designed to make compliance straightforward.
Disclaimer: This guide is provided for general information purposes only. It does not constitute legal advice and should not be relied upon as a substitute for professional WHS advice specific to your circumstances. Always consult a qualified WHS professional or your state regulator for guidance on your obligations.
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