Silicosis is one of the oldest recognized occupational lung diseases. Artificial stone has created a new form of the problem.

Artificial stone, also called engineered stone or quartz, became widely used for kitchen and bathroom countertops beginning in the 1980s. Many traditional products contain very high levels of crystalline silica. Cutting, grinding, drilling, or polishing these materials can generate respirable crystalline silica dust that reaches deep into the lungs and can cause irreversible pulmonary fibrosis.

California has issued a stark warning. From January 2019 through June 2026, the California Department of Public Health identified 592 cases of silicosis among workers fabricating engineered-stone countertops. Of these, 65 underwent lung transplantation, and 31 died. The median age at diagnosis was 46. Nearly all identified workers were men, and 98% were Latino.

These numbers do not capture the full burden of disease. Screening has been inconsistent, case detection often depends on symptomatic presentation, and diagnoses are frequently delayed or incorrect. The California investigators concluded that the true burden is underestimated. As a pulmonary physician trained in epidemiology, I believe the cases identified to date may represent the tip of the iceberg.

The problem is not unique to California. Artificial-stone-associated silicosis has been reported internationally, and the 2026 American Thoracic Society Workshop Report characterized it as a severe, rapidly progressive, and preventable occupational lung disease. The medical and public health response has appropriately focused on protecting workers who manufacture, fabricate, and install artificial stone.

But another problem deserves attention: artificial stone already installed in the built environment.

The Legacy Artificial-Stone Problem

Artificial stone is already present in homes, apartments, offices, restaurants, medical and dental practices, and other buildings. These surfaces may remain in place for decades. Eventually, some will be remodeled or removed. Workers may drill, cut, grind, polish, break apart, or discard countertops.

An intact countertop is not the inhalation hazard at issue. The problem arises when silica-containing material is disturbed in a way that generates respirable dust.

The established evidence concerns workers exposed during the manufacture, fabrication, and installation of artificial stone. The downstream legacy problem is an inference from that evidence: silica-containing artificial stone already installed in buildings can again generate respirable crystalline silica when it is later cut, drilled, ground, polished, or broken.

That creates a preventive problem that may persist long after the original fabrication and installation are complete.

The Warning Has to Reach the Person Doing the Work

A homeowner may see only a countertop that needs to be modified or removed. The homeowner may not know who manufactured it, when it was installed, or how much crystalline silica it contains. A contractor or worker performing the renovation may know no more about its composition than the homeowner does.

The manufacturer, original purchaser, current property owner, contractor, subcontractor, and worker may all be different people.

The material remains while the people around it change.

This creates both an information problem and an exposure problem. Recognition of artificial-stone silicosis by physicians, scientists, and regulators does not ensure that the information will reach everyone who will eventually encounter these materials.

The lung does not distinguish between respirable crystalline silica generated in a fabrication shop and that generated while cutting an old countertop in someone’s kitchen.

Prevention Should Follow the Hazard

California is considering an emergency regulation that would prohibit the fabrication and manufacture of artificial stone containing more than 1% crystalline silica. The September 16, 2026 Cal/OSHA document is a discussion draft, not a final regulation.

The proposed 1% threshold should not be construed as a biological definition of safety. California’s existing silica standard already treats specified processing of artificial stone containing more than 0.1% crystalline silica by weight as a high-exposure trigger task that requires enhanced protections. Bulk crystalline-silica content and the concentration of respirable crystalline silica generated during a particular task are not the same measurement.

For newly manufactured materials, durable identification of silica hazards could help preserve hazard information associated with the material as property owners, contractors, and workers change over time. Legacy artificial stone presents a harder problem. Product records may be missing, manufacturers may be unknown, and neither the property owner nor the person performing the work may know the composition of an existing surface.

Silicosis is irreversible and can continue to progress even after exposure ends. There is no established treatment that reverses established silicotic fibrosis, and some patients ultimately require lung transplantation.

By the time a worker with advanced silicosis reaches the pulmonary clinic, primary prevention has already failed.

Artificial stone has transformed an old occupational hazard. The next prevention challenge includes not only workers fabricating countertops today but also people who may encounter silica-containing artificial stone already installed in homes and buildings.

Prevention should follow the hazard.

Before someone cuts an existing artificial-stone countertop, they need to recognize what may be in it.

Artificial Stone Silicosis: The Hazard May Already Be in Our Homes

The Legacy Artificial-Stone Problem

The Warning Has to Reach the Person Doing the Work

Prevention Should Follow the Hazard

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