California has confirmed 542 silicosis cases tied to engineered stone countertop work, and the state is now on a clear path toward banning the material entirely.
The California Occupational Safety and Health Standards Board is taking video testimony Thursday in Santa Rosa from fabrication workers who have the disease. A vote won’t happen before the board’s May 21 meeting in Los Angeles. But the case count alone makes the direction hard to dispute. Of those 542 confirmed cases, 279 are in Los Angeles County.
Silicosis doesn’t negotiate. Workers who cut and grind engineered stone slabs inhale pulverized silica particles that scar lung tissue permanently, progressively blocking oxygen exchange until breathing becomes impossible. There’s no treatment that reverses the damage. A double-lung transplant can extend survival, but it’s a brutal option that rarely buys patients more than a decade, and most can’t access one in time.
Juan Gonzalez Morin died at 37. He spent years cutting and grinding engineered stone countertops in the Los Angeles area before silicosis killed him in 2023. His death drew national attention to what had been happening quietly inside Southern California fabrication shops, where mostly young immigrant men shaped quartz slabs into kitchen and bathroom surfaces with little protection from the dust they were breathing every day.
The cluster first surfaced publicly in December 2022, when Public Health Watch, LAist, and Univision broke the story. Those initial reports documented a disease that workers and their families had already been living with for years. Within five months of that coverage, the California Department of Public Health had confirmed 69 cases. As of April 8, 2026, the confirmed total is 542.
The Standards Board didn’t sit on the problem. It adopted an emergency temporary standard in late 2023, requiring employers to control silica dust through water suppression and other protective measures. That standard went permanent in December 2024. But the case count kept climbing, and 29 workers are now dead.
The board is responding to a petition filed in December by the Western Occupational and Environmental Medical Association, a nonprofit with more than 600 physicians and health professionals across eight states. The association’s ask is straightforward: ban all fabrication and installation work involving engineered stone.
Engineered stone gets its market appeal from what also makes it lethal. Manufacturers crush quartz, then bind it with resins and pigments to create slabs that can be molded into consistent, repeatable shapes. That process makes the slabs cheaper than granite or marble, and it’s driven their adoption across residential and commercial construction for two decades. The problem is quartz. It contains crystalline silica at concentrations far higher than natural stone, and the Occupational Safety and Health Administration has long identified respirable crystalline silica as a serious occupational hazard. When a fabricator runs a grinder across one of these slabs, the cut releases fine silica particles that stay airborne long enough to be inhaled deeply into the lungs.
Protective equipment and dust suppression can reduce exposure. They can’t eliminate it. That’s the argument behind the ban petition, and it’s the argument the Standards Board will be weighing when it meets on May 21 in Los Angeles.
California wouldn’t be the first jurisdiction to act. Australia banned engineered stone fabrication in July 2024 after its own silicosis outbreak among countertop workers drew similar attention. The science behind that ban and the science behind this one is the same.
“We’re seeing workers in their 30s and 40s dying from a preventable disease,” said a physician affiliated with Western Occupational and Environmental Medical Association in testimony submitted to the board.
What California does next will set a precedent. The state has roughly 1,000 fabrication shops, according to industry estimates, and the workers inside them are watching this process closely. So are fabricators in other states, who could face similar regulatory pressure if California moves first. The Standards Board’s May 21 vote won’t be the final word, but it’ll tell you which way this goes.
There are 29 dead workers. There are 542 confirmed cases. The board meets May 21.