Crystalline Silica Regulations NSW: 2026 Compliance Guide

Respirable crystalline silica (RCS) is among the most tightly regulated airborne contaminants in Australian workplaces. Cutting, drilling, crushing or grinding materials such as concrete, brick, tile, mortar and sandstone releases fine dust particles small enough to reach deep lung tissue. Repeated exposure can cause silicosis, lung cancer and chronic obstructive pulmonary disease (COPD) — conditions that are irreversible but almost entirely preventable with the right controls.

In New South Wales, these controls are enforced under the Work Health and Safety Regulation 2025 (NSW), which commenced on 22 August 2025 and carries forward the dedicated crystalline silica provisions in Chapter 8A, alongside national guidance from Safe Work Australia and enforcement by SafeWork NSW. Non-compliance can attract on-the-spot fines, improvement and prohibition notices, and prosecution.

What Counts as a Crystalline Silica Substance?

Under the WHS Regulation, any material containing at least 1% crystalline silica by weight (w/w) is a crystalline silica substance (CSS). This captures most common construction materials — concrete, fibre cement, bricks, pavers, tiles, mortar and natural stone — so the practical starting point for any project is verifying silica content through the safety data sheet, technical data or laboratory analysis.

Since 1 July 2024, the manufacture, supply, processing and installation of engineered stone benchtops, panels and slabs has been banned nationally — a direct response to the accelerated silicosis cases seen in benchtop fabrication workers. Work on legacy engineered stone already in place (removal, repair, minor modification or disposal) remains lawful, but it is treated as high-risk CSS processing: it must be notified to SafeWork NSW and carried out under controlled conditions.

Silica Exposure Limits: The WES to WEL Transition

The legal exposure limit for respirable crystalline silica is an eight-hour time-weighted average (TWA) of 0.05 mg/m³. Exceeding it is a breach of the WHS Regulation today — not only after the upcoming framework change.

• From 1 December 2026, the national Workplace Exposure Standards (WES) list will be replaced by the Workplace Exposure Limits (WEL) More than a name change, the shift reframes each value as a hard ceiling on exposure rather than a benchmark, and brings Australian terminology into step with overseas regulatory practice.
• For RCS, the WEL will commence at the current value of 0.05 mg/m³. A reduction to 0.025 mg/m³ has been proposed and is under further impact analysis by WHS ministers. Sites that sit just under the current limit should be planning now for a tighter threshold.
• Exceedance reporting: in NSW, any air monitoring result above the exposure limit for RCS must be reported to SafeWork NSW. Monitoring records must be kept for 30 years.

High-Risk Silica Processing and Mandatory Dust Controls

Processing a CSS — using power tools or mechanical plant to cut, grind, crush, trim, sand, polish or drill it — is classed as high risk where it is reasonably likely to result in a risk to a person’s health. The assessment must consider factors including the silica content of the material, the task, its frequency and duration, and whether airborne RCS is reasonably likely to exceed half the exposure limit (0.025 mg/m³). If you are unsure, treat the work as high risk until an assessment shows otherwise.

Uncontrolled dry processing of silica-containing materials is prohibited. Dust must be suppressed or captured at the source using controls such as:

• Wet dust suppression — continuous water feed to the cutting, grinding or drilling point.
• On-tool extraction (LEV) — dust shrouds connected to a suitably rated industrial vacuum.
• HEPA-filtered vacuum systems — H-class units (or M-class where a risk assessment supports it) for capture and clean-up.
• Isolation and enclosure — separating the process, or the operator, from the dust source.

Housekeeping is regulated to the same standard: dry sweeping and compressed-air blow-down are banned for silica-containing dust. Use wet methods or HEPA-filtered vacuums instead.

Risk Control Plans, the Silica Worker Register and Health Monitoring

Before high-risk CSS processing starts, a PCBU must have the following in place:

• Silica risk control plan: a written plan documenting the controls, RPE and procedures for the task, made available to workers before processing begins. For high-risk construction work, a compliant safe work method statement (SWMS) can serve this purpose.
• NSW Silica Worker Register: operating since 1 October 2025, this register requires PCBUs to notify SafeWork NSW of every worker carrying out high-risk CSS processing — including each worker’s details, the work location, and whether the work is associated with tunnelling — within 28 days of the processing commencing. Notify via the SafeWork NSW Silica Worker Register.
• Accredited training: workers involved in high-risk processing must complete accredited or regulator-approved crystalline silica training, with records retained.
• Respiratory protective equipment (RPE): RPE supplements — never replaces — engineering controls. Respirators must be selected, fitted and maintained in line with AS/NZS 1715, with fit testing repeated at least annually and whenever facial characteristics change.
• Health monitoring: the PCBU must arrange and pay for health monitoring, including baseline and periodic lung function testing, for workers at significant risk of RCS exposure.

NSW Silica Compliance Checklist

Use this checklist as a rapid self-audit for construction, demolition, manufacturing or tunnelling sites in NSW:

Air Monitoring for Silica Exposure

Air monitoring converts silica compliance from assumption into evidence. It quantifies what workers actually breathe, confirms whether controls perform as designed, and provides the exposure data that risk assessments, health monitoring programs and regulator notifications depend on.

When monitoring is needed

• Baseline monitoring when silica-generating tasks commence, establishing a reference exposure profile for the site or process.
• Ongoing monitoring at a frequency matched to the risk, to demonstrate continued compliance with the exposure limit and detect drift as conditions change.
• Task-based monitoring during representative high-risk activities such as cutting, grinding and drilling, so results reflect real working conditions rather than averages.
• Verification monitoring after new controls are installed, or where there is uncertainty about whether the exposure limit is being exceeded.

How exposure is measured

Personal sampling is the benchmark method: a calibrated pump draws air through a size-selective cyclone and filter worn in the worker’s breathing zone across the shift, with the collected respirable dust analysed for crystalline silica by a NATA-accredited laboratory. Static (area) sampling helps map dust sources and evaluate controls, while real-time dust monitors provide immediate indicative feedback for identifying high-emission tasks — though they do not replace gravimetric personal sampling for compliance purposes.

Acting on the results

Results are interpreted against the 0.05 mg/m³ exposure limit by an occupational hygienist, with an action level (commonly 50% of the limit) used as the trigger to investigate and improve controls before exposures become exceedances. Where a result exceeds the limit, controls must be reviewed and the result reported to SafeWork NSW. All monitoring records must be retained for 30 years, and results communicated to the workers involved.

Frequently Asked Questions

What is the legal silica exposure limit in NSW?

An eight-hour time-weighted average of 0.05 mg/m³ of respirable crystalline silica. From 1 December 2026 this becomes a Workplace Exposure Limit (WEL), with a possible future reduction to 0.025 mg/m³ under review.

Is engineered stone banned in Australia?

Yes. Since 1 July 2024, manufacturing, supplying, processing or installing engineered stone benchtops, panels and slabs is prohibited nationally. Controlled work on legacy engineered stone already installed remains permitted with notification to SafeWork NSW.

Do I need to register my workers on the NSW Silica Worker Register?

If your business carries out high-risk processing of crystalline silica substances in NSW, you must notify SafeWork NSW of each worker involved within 28 days of the processing commencing.

Is air monitoring for silica mandatory?

Air monitoring is required where there is uncertainty about whether the exposure limit is being exceeded, or where it is needed to determine worker exposure — which is the practical reality for most high-risk silica processing. Sampling must be carried out in accordance with recognised methods and analysed by a NATA-accredited laboratory.

Silica Air Monitoring and Compliance Support

Hazmat Services provides silica exposure assessment across NSW — personal and static air monitoring by experienced occupational hygienists, NATA-accredited laboratory analysis, control verification, silica risk control plan development and exposure reporting that stands up to SafeWork NSW scrutiny. Contact Hazmat Services to book silica air monitoring or discuss your site’s compliance obligations.

Contact Us