10 Types of Risks in Risk Assessment: A WHS Guide

A crew can stand on the same site, look at the same task, and still need different controls. One worker is worried about a conveyor, another about a roof edge, and a supervisor is trying to get the SWMS signed before the lift starts. If you classify the risk wrongly, the paperwork looks neat but the controls miss the exposure under the WHS Act and SafeWork Australia guidance. That's the difference between a working SWMS and a form that only proves someone filled in boxes.

The practical way to handle the types of risks in risk assessment is to sort them by how they show up on site, then link each one to the right control, the right owner, and the right review trigger. That keeps construction and manufacturing teams focused on the risks that hurt people, stop work, damage plant, or create compliance exposure. It also keeps digital records useful, because the register, the permit, the training record, and the incident report all point back to the same live risk picture.

For fleet and mobile plant exposures, fleet safety management essentials is a useful related read.

Table of Contents

• 1. Physical and Mechanical Hazards
• 2. Chemical and Biological Substances
• 3. Work at Height Hazards
• 4. Manual Handling and Ergonomic Hazards
• 5. Environmental and Weather-Related Hazards
• 6. Electrical Hazards
• 7. Confined Space Hazards
• 8. Biological and Infectious Disease Hazards
• 9. Psychosocial and Mental Health Hazards
• 10. Traffic and Mobile Equipment Hazards
• Comparison of 10 Workplace Risk Types
• Putting the Taxonomy to Work on Site

1. Physical and Mechanical Hazards

A press, a conveyor, a scaffold deck, a trench wall, they all look like ordinary work until something moves, drops, or fails. These hazards are the obvious ones on a site, which is exactly why teams sometimes treat them too casually. The first control is usually elimination or substitution, then engineering controls like guarding, edge protection, exclusion zones, and isolation. Administrative controls and PPE come after that, not before.

In manufacturing, unguarded press machinery and conveyor belts create contact and entanglement risks. In construction, trench collapse, scaffold failure, and falls from height are the same broad category of harm, even though the task looks different. In demolition, structural collapse and falling debris need a tighter exclusion zone and a more cautious sequencing plan than a routine strip-out.

Practical rule: if the control depends on people remembering to “be careful”, it's not enough for a mechanical hazard.

A useful digital system records the guard inspection, the maintenance sign-off, and the asset details in one place. That matters when a plant manager needs to prove the machine was serviceable before use, or when a supervisor needs to stop work because a guard is missing. Preventive maintenance alerts and accessible specifications reduce the chance that a problem gets discovered only after someone's already exposed.

A site-specific SWMS should say who isolates the energy source, who verifies the isolation, and who checks the guarding before restart. If the task changes, the hazard changes with it. That's where a static register falls over and a live review process earns its keep.

2. Chemical and Biological Substances

Chemical exposure is often boring right up until someone breathes it in, touches it, or tracks it through the job. Solvents, fuel, adhesives, silica dust, asbestos, and waste streams all need different controls because the harm mechanism is different. CCOHS defines a hazard as a potential source of injury, adverse health effect, or damage, and that's exactly how this class should be treated on site, as a source that can harm people through exposure, not just a box ticked on a register (CCOHS hazard and risk assessment guidance).

In manufacturing, spray coating areas without respiratory protection create inhalation exposure that needs containment, ventilation, and fit-tested respirators. In construction, concrete or masonry cutting without dust suppression is a classic silica control failure. In demolition, friable asbestos changes the whole plan, because containment, licensing, and clearance become part of the task, not afterthoughts.

Biological hazards can sit alongside chemical ones. Confined space work can expose crews to toxic or oxygen-deficient atmospheres, while remediation and demolition can uncover contamination that wasn't obvious during the pre-start. That's why SDS access on mobile devices, inventory control, and disposal tracking matter. If people can't see what's on site, they can't control it properly.

A clean register doesn't protect anyone if the drum, the dust, or the contaminated waste is already in the work area.

For hazardous materials work, hazardous drug compliance tips is a relevant external reference point, especially where chemical handling discipline needs to be tightened. In a digital H&S system, the best practice is simple, keep the SDS, PPE checks, fit testing, and disposal records in one workflow so no one is relying on email threads or a folder on one laptop.

3. Work at Height Hazards

Height work is where a small planning error turns into a major injury very quickly. The safest control order still starts with elimination. If you can do the work from the ground, a MEWP, or a designed access platform, that beats sending someone onto a roof or scaffold edge every time.

Construction crews know the obvious versions, roof cladding without edge protection, scaffolds that haven't been inspected properly, and access ladders used as working platforms. Industrial maintenance crews run into the same problem on high-level plant and fixed machinery. Telecommunications climbers and facade teams add another layer, because the rescue plan has to be credible, not just written down.

The risk review should be tight. Weather, access quality, anchor points, competency, rescue arrangements, and supervision all matter. If a harness is the main control, the assessor should be asking what stops the fall in the first place, and what gets the worker back down safely if the system fails.

A central platform helps because SWMS, inspection photos, and competency records sit against the same task. That makes it easier to prove edge protection was in place before work started, and easier to stop a job if the setup changed. For work at height planning that often overlaps with access or confined conditions, the internal guidance at https://safetyspace.co/confined-space-and-working-at-heights is worth reviewing once, then folding into your site procedure.

Control check: fall arrest is not a substitute for a proper access plan.

If the site has multiple subcontractors, this is one of the first risk types that drifts during the day. One crew removes a guardrail to do their job, another crew walks in later, and no one resets the control. That's a review trigger, not a paperwork issue.

4. Manual Handling and Ergonomic Hazards

Manual handling injuries don't usually come from one dramatic moment. They come from repeated lifts, awkward reaches, poor posture, and jobs that were never designed for the human body doing the work. Bricklayers, assembly line workers, maintenance staff in tight plant rooms, warehouse pickers, and concrete finishers all know the pattern.

The hierarchy of control still applies. Mechanical aids, job redesign, load reduction, and job rotation beat “lift with your legs” every time. When people are reaching overhead, twisting in confined spaces, or repeating the same motion all shift, the work design is the problem, not the worker's attitude.

In manufacturing, repetitive hand and arm movement without rest breaks is a classic ergonomic failure. In warehousing, pallet jacks, trolleys, and lifters should be built into the task, not treated as optional extras. In construction, carrying blocks, forms, and tools over uneven ground adds force, fatigue, and slip risk at the same time.

Practical rule: if a task hurts on the second round, don't wait for the second injury.

A digital system should record the ergonomic assessment, the control decision, and the follow-up actions. That's useful when you want to show the task changed, not just the paperwork. It also helps supervisors spot patterns in incident reports, especially when the same trade keeps reporting the same body part, the same task, or the same awkward access point.

For manual handling technique and task setup, manual handling techniques gives a practical internal reference. Use that type of guidance to support the SWMS, not replace it.

5. Environmental and Weather-Related Hazards

Outdoor work in Australia can shift fast from manageable to risky. Heat, cold, wet conditions, dust, poor air quality, and noise all change the job. They also make other hazards worse, which is why environment is rarely just an extra line on a checklist.

Heat stress during roofing or concrete work is a different control problem from hearing damage in a workshop, but both belong in the same risk picture. In foundries and smelters, radiant heat creates thermal load that has to be managed through timing, breaks, hydration, and monitoring. On wet sites, slips and plant interaction risks rise together, especially where cleaning or access work is happening in the same zone.

Noise deserves real attention because it's easy to normalise. Presses, saws, grinders, and demolition plant can create permanent harm if the work is left unmanaged. Dust and poor visibility in demolition, quarrying, and cutting tasks create a second layer of risk because people can't see what's moving, dropping, or changing.

A useful control system can pull weather alerts into the H&S workflow and trigger heat or wet weather protocols before the crew starts. It should also hold environmental monitoring records so supervisors can see trends instead of guessing from memory. That's especially helpful when the same site runs in different seasons or with different subcontractors.

Environmental conditions are not background noise. They change the likelihood and impact of every other hazard on the job.

If the forecast, the actual conditions, and the control plan don't match, the assessment is already stale. That's when a dynamic review is warranted, not at the end of the shift.

6. Electrical Hazards

Electricity doesn't forgive sloppy isolation. Live conductors, faulty leads, poor earthing, overloaded boards, and unsafe temporary installations can all create electrocution, burn, and arc flash risk. Construction and manufacturing both see this problem because the work is often temporary, mobile, and under pressure.

In construction, trench excavation near underground cables and crane work near overhead lines need strict planning. In manufacturing, maintenance on live machinery without proper lockout is one of the most avoidable exposures on site. Wet areas add another layer, because electrical tools near water need stronger controls, not a relaxed attitude.

Control hierarchy involves isolation, verification, lockout, and test before touch. RCD protection, inspection of leads, and equipment testing are support controls, not the main defence. Site offices and workshops also need attention, because damaged extension leads and overloaded boards are often treated as housekeeping issues until they turn into fire or shock events.

Digital equipment registers help because they keep test dates, due dates, and fault history in one place. Digital lockout checklists also reduce variation between supervisors and shifts, which is where many electrical failures start. A pre-start toolbox talk should name the electrical hazards specific to the day's work, not just repeat a generic warning.

The Australian framework described in the NIST risk guidance is useful here because risk is treated as a combination of likelihood and impact, with controls chosen on that basis (NIST SP 800-30 Rev. 1). That lines up well with a WHS approach, especially when the same task has different voltage exposure, different weather, or different access conditions across sites.

7. Confined Space Hazards

Confined space work punishes assumptions. A tank, trench, vault, or pipeline can look harmless from the outside and still hide oxygen deficiency, toxic gas, engulfment, or an atmosphere that won't support life. Rescue is hard, and that's why the first entrant is often the second casualty.

Construction crews entering excavations for utility work need atmospheric testing, ventilation, permits, and rescue planning. Manufacturing maintenance teams entering reactors or tanks need the same discipline, even when the job seems routine. Sewage, wastewater, and industrial services add contamination and exposure issues that make PPE alone completely inadequate.

A confined space assessment should be specific about entry conditions, testing sequence, standby arrangements, communication, and rescue capability. Generic wording doesn't help when the atmosphere can change while the crew is inside. The permit-to-work process should force the supervisor to verify that the pre-entry checks were done, not assumed.

If rescue relies on “we'll just pull them out”, the plan is already broken.

Digital permit systems work well here because they create time-stamped checks, permit status, and rescue notification records in one place. That matters when you need to prove the controls were in place before entry and maintained during the task. It also matters when the job gets interrupted, because a return to work after a break should trigger a fresh review, not a blind restart.

In practice, the best confined space systems treat atmosphere, competence, and rescue as linked controls. If one changes, the whole assessment needs a look.

8. Biological and Infectious Disease Hazards

Biological hazards do not disappear because the job is on a construction site or in a factory yard. Blood-borne pathogens, respiratory viruses, bacterial contamination, animal waste, contaminated soil, and sewage all create exposure risk in Australian industrial work. The job is to identify where biological exposure can enter the task, then put controls around that point.

Demolition and remediation crews often find contamination that was never obvious in the original scope. Waste workers handle mixed loads and contaminated materials. First aiders can be exposed during a medical emergency if barriers, training, and post-exposure procedures are unclear. Trenching and excavation crews can also strike contaminated soil or sewage during utility work.

Controls start with screening, hygiene, barriers, vaccination where relevant, and a clear post-exposure response. On active sites, that means pre-start checks, disposal arrangements, handwashing access, spill response, and clear direction for contractors before the job starts. A mobile-friendly incident protocol helps because workers can report exposure and follow the next steps without waiting for office hours.

For teams that need a structured internal process, the psychosocial risk assessment process is a useful companion resource because biological incidents often create stress, confusion, and procedural failure when the response is weak. The control is only useful if workers can find it, use it, and report when it breaks down. For teams wanting extra support around worker response and recovery, the anxiety learning resources can also help as part of a broader support pathway.

Track the hazard in the assessment, then link it to the actual control. If the control is just “use PPE”, the assessment is incomplete. Biological risk often needs more than one barrier, and it needs fast communication when the conditions change.

9. Psychosocial and Mental Health Hazards

It is 5:30 am. The crew is already behind, a supervisor is copping calls from the client, two contractors are arguing over access, and nobody wants to be the one who says the program cannot be met safely. That is a psychosocial hazard. It sits in the job design, the pressure, the behaviour, and the lack of control workers have over the day.

On construction sites, the pattern usually shows up as impossible deadlines, stacked trades, poor consultation, fatigue, and abusive behaviour that gets brushed off as part of the industry. In manufacturing, it often comes from repetitive high-output work, fixed breaks, low decision-making control, overtime, and supervisors carrying production pressure from both sides. The risk is practical. Concentration drops, shortcuts increase, conflict escalates, and people stop reporting issues because they expect nothing will change.

Treat this category like any other hazard class. Identify the trigger, assess who is exposed, and apply the hierarchy of control to the work, not just to the person. Administrative controls such as reporting channels, training, and EAP access have a place, but they sit low in the order. Better controls are redesigning rosters, fixing staffing levels, changing sequencing, clarifying roles, stopping unreasonable after-hours contact, and training supervisors to manage workload and behaviour properly.

A survey is not a control.

What works on site is a specific action tied to a real task or team. If a fabrication workshop is running twelve-hour shifts to recover lost production, the review should ask whether the shift pattern, staffing, break structure, and output target are creating fatigue and conflict. If a commercial build has repeated clashes between trades because the program keeps changing, the control may be better planning, clearer authority lines, and a daily coordination meeting that resolves access issues.

Capture psychosocial hazards in the same digital H&S system used for plant, chemicals, and SWMS actions. Log the issue, the source of pressure, the affected workgroup, the control owner, and the review date. Keep complaint pathways confidential, but do not let the risk sit in a separate HR silo where operations never see it. The value of the system is traceability. Supervisors can show what was raised, what changed, and whether the control reduced the risk.

Support still matters for the individual worker. Teams that want added worker support can include anxiety learning resources in the broader response pathway, especially where stress, panic, or sleep disruption is already affecting work.

The test is simple. If the only control is “tell someone if you are stressed,” the risk assessment is weak.

10. Traffic and Mobile Equipment Hazards

A forklift, excavator, truck, or work platform at height can be the most dangerous thing on site when people and plant share the same space. Reversing incidents, struck-by events, rollovers, and collisions usually come down to poor separation, poor visibility, or poor discipline around the traffic plan. The site might look orderly from the office, but the risk picture on the ground can be very different.

Construction sites are especially exposed when trucks reverse without spotters or cameras. Warehouses face the same issue when forklifts and pedestrians mix at speed. Manufacturing yards, quarries, and open pit operations add complexity because the ground, the routes, and the loads all change during the shift.

The controls that work are boring and effective, segregated routes, speed control, spotters where needed, visibility aids, pre-start checks, and induction. A traffic management plan should be customised to the actual site layout, not copied from another project. Operators also need current competency, because a licence or ticket doesn't stop bad habits from developing.

A digital pre-start checklist helps supervisors confirm the vehicle is safe before movement begins. Training records and refresher reminders matter just as much, because competence fades if it isn't maintained. Site inductions should show every worker where they can walk, where they can't, and how plant will move during the day.

The practical split between hazard, operational, and traffic control really pays off. The hazard is the moving plant. The risk is the strike, crush, or rollover event. The control is the separation, the check, and the verified behaviour on that specific site.

Comparison of 10 Workplace Risk Types

Putting the Taxonomy to Work on Site

The list only helps if it changes how the site runs. Map each risk type to a SWMS or safe work procedure, attach the controls, and name the competency requirements beside them. Then load the lot into one H&S platform so inspections, permits, training, and incident reports roll up into a live picture instead of sitting in separate folders.

That matters because a single static register can't keep pace with rotating subcontractors, changing shifts, and multi-site operations. When the crew changes, the plant changes, or the weather turns, the review has to move too. A connected system gives the PCBU one place to standardise the 10 risk types across every site and verify controls in real time, which is far better than chasing paper after the event.

A practical monthly routine works better than a grand annual clean-up. Review the two risk types that caused the most incidents last quarter, rebuild their controls inside your system, and make sure the review owner is named. If the system can't show who checked the control, when they checked it, and what they found, it isn't giving you a live risk picture.

Safety Space fits that operating model because it brings forms, oversight, and multi-site control into one place without forcing teams back to spreadsheets or scattered documents. Use it to keep the assessment current, link the controls to the task, and show SafeWork Australia-aligned practice without duplicating the same information five times.

If you want to tighten up how your team classifies, controls, and reviews workplace risks, visit Safety Space and see how a single H&S platform can hold your SWMS, permits, inspections, and incident records together. Start with the two risk types that have caused the most trouble on your sites, then build their controls into one live system this month.