Managing respirable crystalline silica dust at worksites means controlling dust from tasks like cutting, grinding, or tunnelling to avoid exposing workers to unsafe levels. Under Work Health and Safety Regulation 2025, any material with at least 1% crystalline silica is a crystalline silica substance. Processing it without controls is a breach.
This article explains what silica is, why it is dangerous, and what the new WHS Regulation requires. You will learn how to assess risks, apply effective controls, prepare a silica risk control plan, and keep your workplace both compliant and safe.
What is Respirable Crystalline Silica (RCS)?
Crystalline silica is a mineral found in natural stone and many building products like quartz, cristobalite, tridymite, and tripoli. Cutting, grinding, drilling, quarrying, or tunnelling these materials releases fine dust particles called respirable crystalline silica, which can penetrate deep into the lungs. Prolonged exposure can lead to silicosis, lung cancer, and chronic obstructive pulmonary disease. Because these illnesses often develop slowly, controlling dust at the source is critical.
Under WHS Regulation 2025, any material containing at least 1% crystalline silica by weight is defined as a crystalline silica substance (CSS). Engineered stone is included, while products such as concrete, bricks, tiles, and plasterboard are excluded. CSS processing covers activities like cutting, sanding, crushing, quarrying, tunnelling, and certain manufacturing or handling tasks.
How To Identify and Assess Silica Dust Hazards
To apply the right controls, you first need to recognise where silica dust hazards exist and how severe they are. Certain processes create much higher risks than others, particularly those that disturb large amounts of stone or mineral material. These activities can generate respirable crystalline silica, which requires close attention to both the task and the conditions under which it is carried out.
High-risk processes include:
- Engineered stone fabrication, such as cutting and polishing benchtops
- Tunnelling with roadheaders or similar machinery
- Quarrying, crushing, and mechanical screening of stone
- Abrasive polishing or grinding of silica-containing products
Key factors to assess:
- Silica content of the material being processed
- Frequency and duration of the task
- Past exposure incidents and near misses
- Results from air monitoring data
For all high-risk crystalline silica substance processing, a documented risk assessment is required. This record must outline the hazards, identify exposure levels, and describe the controls in place. Keeping assessments current ensures hazards are not overlooked and compliance obligations are met.
When is the Processing of CSS Considered Controlled?
Once hazards are identified, the next step is to confirm when crystalline silica substance (CSS) processing can be regarded as controlled. Processing is only considered controlled when exposure to respirable crystalline silica is reduced to the lowest level reasonably practicable through a combination of engineering, administrative, and personal protective measures. Key control measures include:
- Isolation of Workers. Place barriers or distance between workers and silica dust-producing tasks.
- Enclosed Cabins with HEPA Filtration. Use sealed operator cabins to prevent dust entry.
- Wet dust suppression. Apply water or mist systems directly at the source to prevent dust becoming airborne.
- On-tool extraction systems. Fit tools with local extraction units to capture dust as it is generated.
- Local Exhaust Ventilation. LEV reduces the risk of harmful exposure by drawing silica dust away from workers in fixed or enclosed work areas.
If any residual risk remains, workers must wear RPE that complies with AS/NZS 1716:2012 and AS/NZS 1715:2009. Fit-testing, training, and strict enforcement are essential to ensure the equipment provides effective protection.
What are the Duties for Managing High-Risk CSS Processing?
No processing can take place unless the risks are managed. A detailed silica risk control plan is mandatory for all high-risk activities. The plan must include:
- Identification of tasks: List all high-risk CSS processes performed on site.
- Risk assessments and controls: Record the hazards identified, the level of exposure, and the measures selected to reduce risk.
- Implementation and monitoring: Explain how controls will be applied, how their effectiveness will be checked, and how often they will be reviewed.
- Accessibility: Ensure the plan is written in clear language, available to every worker, and easy to understand.
Meeting these duties ensures safe processes in line with WHS requirements. The next step is ensuring compliance with the silica risk control plan.
How Do You Ensure Compliance with a Silica Risk Control Plan?
Workers must receive and understand the plan before any task begins, as this forms the foundation for safe and consistent practice. Without strict compliance, controls designed to prevent exposure to respirable crystalline silica will not protect workers effectively. Key requirements for compliance include:
- Pre-work distribution: Provide the plan to every worker before they start, ensuring they know the high-risk tasks, the controls in place, and their responsibilities.
- Enforcement on site: Stop processing immediately if the plan is ignored or controls are bypassed. This prevents unsafe practices from continuing unchecked.
- Regular review: Revise the plan whenever work processes, equipment, or control measures change. Keep it accurate and relevant to current site conditions.
Using the FocusIMS Field View App, supervisors can upload the latest risk control plan and confirm that workers have read it before signing on. The app can also log digital signatures, record inspection outcomes, and track incidents in real time, ensuring compliance is monitored and documented directly from the field.
What Training and Competency Do Workers Need?
After setting up compliance measures for a silica risk control plan, the next responsibility is ensuring workers receive the right training and can demonstrate competency. Accredited or regulator-approved crystalline silica training is essential for every worker who may be exposed, so they understand the hazards and the safe systems of work in place. Training must cover the following:
- Health risks: Explain how exposure affects the lungs and long-term health, including diseases such as silicosis.
- Control measures: Show how to apply dust suppression, extraction systems, and safe handling techniques correctly.
- Personal protective equipment (PPE): Train workers on the correct selection, fitting, and maintenance of respiratory protective equipment and other PPE.
Keep detailed training records for at least five years after employment ends. These records confirm compliance and provide proof that workers were given the necessary instruction and supervision to manage the risks of respirable crystalline silica.
What are the Air and Health Monitoring Requirements?
After training and competency are addressed, the next step is ensuring air and health monitoring are in place to protect workers. Air monitoring confirms whether dust levels remain below workplace exposure standards and provides data to guide control measures. Regular sampling is critical because even short-term breaches can expose workers to respirable crystalline silica and increase the risk of serious disease.
Air Monitoring Requirements
- Measure airborne concentrations during tasks known to generate dust.
- Compare results against workplace exposure standards.
- If results exceed the standard, notify the regulator within 14 days and take immediate corrective action.
Health Monitoring Requirements
- Provide health monitoring to all workers engaged in high-risk crystalline silica substance (CSS) processing.
- Monitoring must be carried out by a registered medical practitioner familiar with silica-related health risks.
- Include regular respiratory health checks, lung function tests, and medical evaluations to detect early signs of illness.
Both air and health monitoring must be documented, reviewed, and kept accessible so that risks can be tracked and managed effectively across the worksite.
What Control Measures Should Be Applied?
After monitoring results are reviewed, the next priority is applying effective control measures to keep workers safe during crystalline silica processing. A layered approach is required, combining engineering, administrative, and personal protective measures to reduce exposure to respirable crystalline silica.
Engineering Controls
- Use wet cutting and grinding methods to suppress dust at the source.
- Install local exhaust ventilation systems to capture dust before it spreads.
- Provide fully enclosed cabins with filtered air supply for operators of heavy equipment.
- Fit on-tool extraction systems to tools such as saws and grinders.
Administrative Controls
- Schedule high-risk tasks to limit the time each worker spends in dusty environments.
- Rotate staff to reduce individual exposure levels.
- Enforce strict housekeeping using wet cleaning methods or HEPA-filtered vacuum systems—never dry sweeping or compressed air.
Personal Protective Equipment (PPE)
- Provide workers with correctly fitted respirators that meet Australian standards.
- Carry out regular fit testing and compliance checks to ensure ongoing protection.
- Train workers in how to maintain, store, and replace respirators.
These controls must work together to create a safe system of work that consistently prevents harmful exposure.
How Should You Plan and Respond to Emergencies?
Building on established control measures, you also need to prepare for situations where exposure risks escalate unexpectedly. Emergency planning ensures workers are protected if a sudden release of respirable crystalline silica occurs during processing or handling activities.
Emergency Procedures
- Develop clear, written steps for responding to accidental high exposure incidents.
- Train all workers to recognise emergency situations and follow the procedures immediately.
Medical Response and Support
- Provide immediate access to first aid and ensure medical support is available when required.
- Establish clear reporting channels so that supervisors and safety officers are notified without delay.
Incident Investigation and Corrective Action
- Investigate every incident to identify root causes.
- Apply corrective actions promptly to prevent recurrence, such as improving controls, updating equipment, or strengthening training.
- Review and revise emergency procedures after each incident to ensure they remain effective.
This structured approach ensures that emergencies are managed quickly and effectively, protecting both workers and the worksite.
What are the Legal and Regulatory Compliance Requirements?
The next step is meeting the legal and regulatory duties. Compliance is not optional, and penalties apply to both individuals and corporations if silica-related obligations are breached. The regulations specifically address the risks of respirable crystalline silica, requiring businesses to maintain thorough records and demonstrate effective risk management. These are key compliance requirements when working with respirable crystalline silica:
- Maintain documentation: Keep written risk assessments, silica risk control plans, air monitoring results, and health monitoring records up to date and accessible.
- Demonstrate compliance: Be prepared to show evidence of risk controls during inspections and audits. Regulators will expect to see that duties are being met in practice, not just on paper.
- Meet WHS 2025 obligations: Ensure all control measures, training, and monitoring processes are aligned with current legislative requirements.
By treating compliance as a structured and ongoing process, businesses reduce legal risks while protecting worker health.
How Do You Continuously Improve Silica Dust Management?
The next focus is on strengthening silica dust management through continuous improvement. This approach ensures that controls remain effective in protecting workers from the long-term effects of respirable crystalline silica and responsive to changing work conditions. Here are ways to drive continuous improvement:
- Review risk assessments and plans: Revisit silica risk control plans and task-specific assessments on a scheduled basis, especially after incidents, changes in processes, or the introduction of new materials.
- Adopt better technology: Stay updated on dust suppression systems, extraction tools, and monitoring devices that provide safer and more efficient control of airborne particles.
- Engage the workforce: Encourage workers to report hazards, suggest safer methods, and take part in toolbox talks or reviews of site practices. Their direct input often highlights risks that may not appear in written assessments.
- Track performance over time: Use inspections, audit results, and monitoring data to identify trends and address recurring issues before they escalate.
By treating improvement as an ongoing cycle, businesses strengthen both compliance and worker protection.
Takeaway Message
Continuous improvement leads naturally to a clear understanding of the priorities for managing silica risks. Respirable crystalline silica is a serious hazard that demands strict control to prevent irreversible disease. Under WHS 2025, processing must be controlled, a written silica risk control plan prepared for high-risk tasks, and both air and health monitoring maintained.
Workers need appropriate training and equipment, while records must be kept to demonstrate compliance. By applying these measures consistently, you protect health, reduce legal risks, and build safer worksites where exposure is effectively managed and long-term impacts are significantly minimised.
