State authorities are evaluating a 1% limit on crystalline silica content to enhance occupational health protections.
Re-evaluating Protection Standards
The California Division of Occupational Safety and Health (Cal/OSHA) is currently drafting new regulatory measures regarding the processing and installation of engineered stone. At the center of ongoing consultations is a proposal to limit the crystalline silica content in processed materials to no more than 1%.
This initiative follows Petition 609, submitted by scientific and medical organizations requesting a review of current workplace standards (Title 8, Section 5204). The move was prompted by documented cases of silicosis among workers involved in cutting and polishing countertop surfaces, a condition caused by prolonged exposure to respirable silica dust.
Understanding the Hazards of Silica Exposure
Engineered stone typically contains significantly higher levels of crystalline silica compared to natural stone alternatives. Cutting or grinding these materials generates fine respirable crystalline silica (RCS) particles.
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Occupational Hazard: Prolonged inhalation of these particles without adequate control measures is linked to severe respiratory issues and lung disease.
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Affected Demographic: Public health data indicates that silicosis primarily affects working-age individuals within the construction and fabrication sectors.
The Regulatory Timeline
The path toward updated safety standards in California involves a series of progressive regulatory actions:
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Emergency Temporary Standards (ETS): Introduced in late 2023, requiring wet-cutting methods and specialized respiratory protection.
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Permanent Standard (2025): Integrated emergency provisions into the state’s permanent regulatory framework.
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SB 20 (STOP Act – January 2026): Strengthened compliance measures by mandating wet-cutting protocols, banning compressed air for cleanup, and requiring annual safety training.
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Proposed 1% Silica Cap: Currently under evaluation as a supplementary measure for cases where engineering controls alone may not maintain safe dust levels.
Enforcement and Compliance Actions
In monitoring compliance with existing rules, Cal/OSHA inspectors have actively audited fabrication facilities across the state:
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196 Inspections: Conducted at stone fabrication workshops.
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Violations Issued: Over 980 citations logged for non-compliance with safety protocols.
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Administrative Orders: 33 Orders Prohibiting Use (OPU) issued to temporarily halt machinery or operations lacking proper dust suppression or ventilation.
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Fines: Total proposed civil penalties reached approximately $2 million.
Industry Outlook
If adopted, the proposed 1% silica threshold is expected to accelerate an industry shift toward alternative materials, such as low-silica composites, sintered stone, or natural stone options.
Cal/OSHA continues advisory committee meetings with labor representatives, industry leaders, and occupational health experts to finalize the regulatory details.
