California health officials have documented 592 confirmed cases of silicosis among workers who fabricate engineered-stone countertops, including 31 deaths and 65 lung transplants, according to a report published Aug. 12 in NEJM Evidence. The findings, which cover cases identified between January 2019 and June 2026, highlight the severe health risks posed by crystalline silica exposure in the industry.
State health officials warn of rapid disease progression and high silica levels in engineered stone. The median age at diagnosis was 46 years, with a median age at death of 52 years. Nearly all cases (591 of 592) occurred in male workers, who had a median of 22 years of occupational silica dust exposure. The report notes that engineered stone can contain more than 90% crystalline silica, and cutting, grinding, or polishing slabs releases respirable silica particles into the air.
Health officials first identified silicosis in a countertop fabrication worker in 2019, prompting ongoing tracking of cases. The disease is progressive and incurable, caused by inhaling fine silica dust that scars lung tissue. Symptoms may include persistent cough, fatigue, shortness of breath, and chest pain, though some workers develop the condition without obvious symptoms. Silica exposure is also linked to lung cancer, chronic obstructive pulmonary disease, kidney disease, and autoimmune conditions.
Immediate Response and Regulatory Concerns
The California Department of Public Health (CDPH) issued a public health alert following the report’s findings. Officials emphasized that while silicosis is preventable with proper controls, the required water-based tools and ventilation systems are costly to install and maintain. The report notes that overexposures can still occur even with recommended controls in place.
The American Lung Association has previously highlighted the dangers of silica dust, warning that inhaling it can lead to severe lung damage. The organization has called for stricter enforcement of safety measures in industries where silica exposure is common.
Industry and Worker Perspectives
The engineered stone industry, often marketed as quartz, has faced growing scrutiny over workplace safety. Fabricators cut, grind, and polish slabs, exposing workers to hazardous levels of silica and other volatile compounds. The high silica content in engineered stone—typically more than 90%—makes it a particular concern compared to natural stone.
Worker advocates argue that current safety regulations are insufficient to protect employees from long-term exposure. The report’s findings of rapid disease progression and high co-occurrence of other silica-associated illnesses, including tuberculosis and autoimmune diseases, underscore the urgency of stronger workplace protections.
Long-Term Health and Economic Impact
The health consequences of silicosis extend beyond individual workers. The disease can lead to disability and premature death, with significant economic costs for affected families and healthcare systems. The report’s authors stress that early detection and prevention are critical, as once silicosis develops, the damage to lung tissue is permanent.
California officials have not yet announced specific policy changes in response to the report, but the findings are expected to inform future regulatory discussions. The CDPH and other health agencies continue to monitor cases and advocate for improved safety standards in high-risk industries.
Background: What Is Silicosis?
Silicosis is a progressive lung disease caused by inhaling respirable crystalline silica, a fine dust released when materials containing silica are cut, drilled, ground, or crushed. The particles lodge deep in the lungs, causing inflammation and scarring. Over time, this damage can become severe enough to impair breathing, leading to disability or death. The disease has no cure, and treatment focuses on managing symptoms and preventing further exposure.
The condition is also associated with increased risks of lung cancer, chronic obstructive pulmonary disease (COPD), kidney disease, and autoimmune disorders. Workers in industries such as construction, mining, and countertop fabrication are particularly vulnerable due to prolonged exposure to silica dust.