Hundreds of California workers have developed silicosis, an incurable and potentially fatal lung disease, after exposure to toxic silica dust while cutting, grinding, and polishing engineered stone countertops. As cases continue to rise, California is taking a significant step to prevent further illness and deaths.

On September 16, Cal/OSHA released a draft emergency regulation that would prohibit the fabrication of engineered stone containing more than 1% crystalline silica. National COSH supports this critical step to protect workers and prevent further cases of silicosis, a devastating occupational disease that has disproportionately affected Latino and immigrant workers. The proposed ban is not yet final, and public comments are being accepted through September 30, 2026. [source: DIR]

Engineered stone, commonly used for kitchen and bathroom countertops, can contain high levels of crystalline silica. Cutting or processing the stone releases dangerous dust that, when inhaled, can cause silicosis, permanent disability, respiratory failure, and death. [source: DIR]

The human cost is devastating. A recent study documented 592 California engineered-stone workers diagnosed with silicosis between January 2019 and June 2026. Among them, 65 underwent lung transplants and 31 died. Nearly 98% of those diagnosed were Latino workers [source: NEJM].

The full extent of the crisis may be even greater. Workers may lack access to medical screening and care, while immigrant and low-wage workers face additional barriers, including language differences, limited resources, and fear of retaliation or job loss. Some may be living with silicosis without a diagnosis or the support they need.

Silicosis is not just a California crisis. Cases among stone fabrication workers have been documented in multiple states, underscoring the need for stronger protections nationwide. [source: CDC] California's proposed ban could set an important precedent for protecting workers across the country.

National COSH calls for swift adoption of effective protections, strong enforcement, and access to medical screening, treatment, and workers' compensation for affected workers. Workers and their organizations must have a meaningful role in shaping and implementing these protections to prevent further illness and deaths.

Worker Education and Prevention

National COSH has developed a bilingual Worker Alert to help workers recognize the dangers of silica exposure and identify steps to protect themselves. We encourage workers, worker centers, unions, and community organizations to share this resource widely.

Read and share the National COSH Worker Alert: ENGLISH here I SPANISH here 

Take Action: Submit Public Comments by September 30

Cal/OSHA is accepting public comments on the proposed emergency regulation through September 30, 2026. Workers, unions, worker centers, community organizations, and occupational health advocates are encouraged to review the proposal and share their perspectives on protections needed to prevent silicosis. Review the proposal and comment instructions here  and submit written comments to RS@dir.ca.gov.