California regulators weigh a ban on engineered stone after 662 worker silicosis cases

California began tracking engineered-stone silicosis in 2019. According to the CDC, the first count was six workers: two who had died and four others ^[5][15]. The state's dashboard now lists 662 ^[1], roughly 110 times that first tally ^[15], and the reported number has risen every year ^[14]. A surveillance count measures what gets found. Part of that climb is disease and part is a health department learning where to look, and these figures cannot separate the two. The authors of an August 2026 report in NEJM Evidence think the count is too low, since many workers go undiagnosed or are diagnosed late ^[9].

The 35 deaths and 75 transplants come to 5.3 and 11.3 percent of confirmed cases ^[16][17]. Both are shares of diagnosed workers. They measure how severe the disease is once it is found, and they are not a rate of disease among everyone who cuts the stone. The lung damage cannot be reversed, and silicosis raises the risk of tuberculosis ^[13].

Victoria's screening study is the closest thing to a rate in the record. Screening examines everyone in a workforce, including people who never sought care, so its denominator is the exposed group itself. Its numbers, as Discover reports them, do not agree. 117 of 544 is 21.5 percent ^[18], while the article gives 28.2 percent ^[21]. If 117 is 28.2 percent, the group was about 415 workers ^[19], so the count and the percentage were probably computed on different groups. On either reading, at least one screened worker in five had silicosis ^[18].

California's proposal puts its limit on the slab. It covers engineered stone with more than 1 percent crystalline silica ^[2], and the product is made from 95 percent finely ground quartz bound with polyester resins and pigments ^[4]. Under a rule written this way, a shop cannot qualify by cutting wet or ventilating better, because the prohibition attaches to the material. I think the design means the petition's backers are not counting on workplace controls to protect fabricators. The Discover account does not report whether the California shops behind these cases used wet cutting, exhaust ventilation or respirators, so the record does not show controls being tried and failing.

Silicosis had been falling nationally. The CDC's Morbidity and Mortality Weekly Report counted 185 US deaths in 1999 and 111 in 2013, a 40 percent drop ^[12]. That series ends six years before California started counting engineered-stone cases ^[20]. It cannot show whether the new cases have reversed the decline. David Michaels, an epidemiologist at George Washington University and a co-author of the NEJM Evidence report, said in a statement: "Given the hundreds of diagnosed cases of silicosis in California, there are likely thousands of more cases across the country. Health care practitioners and public health departments should be on the lookout for cases and join the effort to stop this epidemic and save workers lives." ^[10]