California engineered stone silicosis outbreak

The California Department of Public Health has documented a significant health crisis involving 592 confirmed cases of silicosis linked to the handling of engineered stone, such as quartz countertops, between January 2019 and June 2026.

This incurable lung disease is caused by inhaling fine crystalline silica dust during the cutting, grinding, and polishing of stone materials. The disease often affects relatively young workers, with an average diagnosis age of 46. The reported impact includes at least 31 deaths and 65 lung transplants. Data indicates that the silica content in engineered stone can exceed 90%, leading to rapid disease progression and irreversible lung scarring.

While California has implemented stricter handling rules and improved disease tracking, officials warn that the true number of cases is likely underestimated due to a reliance on passive reporting. Experts have called for increased surveillance and policy interventions, noting that while these specific findings are centered in California, there may be thousands of similar cases across the United States. Demographic data shows that men account for approximately 99% of the studied cases.