Silica dust compliance means proving - with current records, not a policy document - that every silica-generating task on your sites is controlled through the hierarchy of controls, that exposure is monitored where it is uncertain, and that workers doing that work are on a health monitoring program. A dust management plan that exists but does not name silica-specific controls will not survive a principal's assurance review or a WorkSafe inspection.
Respirable crystalline silica (RCS) has moved from a background WHS item to one of the highest-scrutiny exposures on Australian sites, and it is worth being direct about why, because the "why" is what auditors and principals are now asking about.
Why is silica dust a compliance priority right now?
RCS is classified as a Group 1 carcinogen - the same category as asbestos - and it is generated by ordinary, everyday civil and construction tasks: cutting concrete, grinding render, drilling brick, crushing or screening aggregate, cutting pavers and kerbing, demolition of masonry. Every crew doing that work is a potential exposure point.
Two things have sharpened the regulatory picture in recent years: the national prohibition on the manufacture, supply, processing and installation of engineered stone (in effect since 1 July 2024), and a tightened workplace exposure standard that leaves very little margin for error. Regulators and principal contractors both read silica dust the same way now - as a live, checkable control, not a paragraph in a safety management plan.
What does the law actually require?
Under the model WHS Regulations, the obligations on a PCBU running silica-generating work are specific, not general:
| Obligation | What it looks like in practice |
|---|---|
| Eliminate or minimise the risk | Apply the hierarchy of controls - substitute the method, engineer the dust out, before relying on PPE |
| Monitor exposure where it's uncertain | Air monitoring for tasks where you cannot be confident exposure stays under the workplace exposure standard |
| Health monitoring | Workers carrying out silica-generating work at risk of exposure go on a health monitoring program, including baseline and periodic checks |
| Respiratory protective equipment | Fit-tested RPE, matched to the actual task, used where engineering controls alone don't bring exposure under the standard |
| Training and information | Workers understand the specific hazard, not just "wear a mask" - what generates dust, what controls apply, why |
The workplace exposure standard (WES) for respirable crystalline silica is 0.05 mg/m3 as an 8-hour time-weighted average - a low number, which is exactly why the regulation leans on engineering controls (wet cutting, on-tool extraction) rather than treating a dust mask as the answer.
How do you control exposure on a live site, not just on paper?
The hierarchy of controls is the right order to work through, and most sites are strongest at the bottom (PPE) and weakest at the top (elimination and engineering):
- Elimination or substitution - can the task be done a different way that generates less dust (pre-cut off-site, different material)?
- Engineering controls - wet cutting, water suppression, on-tool dust extraction attached to the saw or grinder itself. This is where most of the actual risk reduction happens.
- Administrative controls - task rotation, exclusion zones while cutting is underway, scheduling dusty work to reduce the number of people exposed.
- PPE - fit-tested RPE (not a generic disposable mask) as the last line, never the first or only control.
The gap that shows up most often in an internal audit is a plan that lists PPE first and treats engineering controls as optional "if available." That ordering is backwards, and it is the first thing an assessor with any WHS depth will notice.
What does a principal or auditor actually check?
Increasingly, prequalification and site assurance teams ask task-specific questions, not general ones: which tasks on this job generate silica dust, what engineering control is fitted to that tool, who is on the health monitoring program, when was RPE last fit-tested for that person. A generic dust management plan that never names silica by task reads as a document written to pass an audit, not to run a site - and that is precisely the certificate-versus-capability gap that catches contractors out on bigger tenders.
What happens if the controls are only on paper?
The exposure itself doesn't wait for an audit to find it - workers doing uncontrolled silica-generating tasks are exposed every shift the controls aren't actually in place, regardless of what the folder says. Beyond the health outcome, a WHS regulator investigating an incident or a complaint will ask for exposure monitoring records, health monitoring records and RPE fit-test records specific to the task - not a general safety management plan. If those records don't exist, or don't tie to the actual work being done, that is the finding.
Where to start
Run your task list against the hierarchy of controls, honestly: for every silica-generating task on your current sites, can you point to the engineering control fitted, the RPE fit-test on file, and the health monitoring status of the worker doing it? If any of those three is missing or generic, that is where to close the gap first - before a principal's assurance team or a WorkSafe inspector finds it for you.
If you are not certain your system would hold up to that level of task-specific scrutiny today, our free audit-readiness check gives you an honest read on where the gaps are while you still have time to close them.
FAQ
Is respirable crystalline silica actually dangerous? Yes. Respirable crystalline silica (RCS) is classified internationally as a Group 1 human carcinogen, and repeated exposure is linked to silicosis, lung cancer and chronic kidney disease. It is generated whenever concrete, brick, stone or asphalt is cut, drilled, ground or crushed.
What does the law require for silica dust on an Australian construction site? Under the model WHS Regulations, a PCBU must eliminate or minimise airborne contaminant risk using the hierarchy of controls, monitor exposure where there is uncertainty about whether the workplace exposure standard is being met, provide health monitoring for workers carrying out silica-generating work, and supply and fit-test respiratory protective equipment where engineering controls alone are not enough.
What is the workplace exposure standard for silica dust? The nationally harmonised workplace exposure standard (WES) for respirable crystalline silica is 0.05 mg/m3 as an 8-hour time-weighted average. It is a low threshold, which is why engineering controls (wet cutting, on-tool extraction) matter more than PPE alone.
Does the engineered stone ban affect civil and construction contractors? The national prohibition on the manufacture, supply, processing and installation of engineered stone benchtops, panels and tops has been in effect since 1 July 2024. It applies most directly to stonemasons and kitchen/bathroom trades, but any contractor managing subcontractors on a job with engineered stone products needs it in their contractor management and induction controls.
Who checks silica dust controls on a tender or audit? Increasingly, principal contractors and prequalification assessors ask specifically about silica-generating tasks, not just a general dust management plan. A generic WHS management plan that does not name silica-specific controls (wet cutting, on-tool extraction, RPE fit-testing, health monitoring) reads as a gap, not a pass.
How often should silica dust controls be reviewed? Review whenever the work method changes (a new cutting or grinding task, a new subcontractor, a new tool), and as part of the standing internal audit cycle - not just once a year at the external audit. Air monitoring results and health monitoring outcomes should feed back into the risk assessment, not sit in a folder.
Founder, Hillview Business Services. 15+ years inside civil construction, mining and infrastructure businesses.