A popular kitchen countertop material is causing a deadly lung disease in workers

If you walk into a Costco, Home Depot or Lowe’s and order a countertop for your kitchen renovation, the store will likely contract with a local fabrication shop, instructing them to make one from a material called engineered stone.Often marketed as “quartz,” engineered stone is a synthetic product that contains up to 95% finely ground quartz mixed with polyester resins and pigments. The ease with which consumers can order it obscures the fact that workers who cut, grind and polish these kitchen countertops risk developing a terrible disease that destroys their lungs.

open image in galleryIn California alone, more than 550 workers have been diagnosed with silicosis caused by this engineered stone (Getty Images)In California alone, more than 550 workers have been diagnosed with silicosis caused by this engineered stone – a deadly disease that is totally preventable and for which there is no cure. At least 100 of these California workers have undergone or are awaiting a lung transplant, a complicated procedure that extends life but does not provide a long-term cure. At least 30 have died between 2019 and 2026.

We are an epidemiologist and a physician, both specializing in work-related diseases, who have studied the dangers of working with this material. We believe that the surge in silicosis cases is a public health emergency. But the trend is almost invisible outside of California because most states don’t yet track the incidence of the disease.

A fashionable but dangerous materialEngineered stone, introduced just a few decades ago, has become the most popular choice for kitchen countertops. It is more durable but often less expensive than marble.When workers cut, grind and polish these engineered stone countertops for a home, billions of very small crystalline silica particles coated with resins and pigments are released.

The workers inhale these particles, and many develop a severe and rapidly progressive form of silicosis.Like asbestos, silica causes both respiratory disease and lung cancer. The fabrication workers affected are young – the median age of the California workers is 46 and the median age at death is 52.

If they stop working with silica and manage to live a few additional decades, they are more likely to develop lung cancer, kidney disease and various autoimmune diseases than people with no exposure.An estimated 100,000 workers are employed in countertop fabrication shops in the U.S.

, and studies suggest that 20% or more of exposed workers develop silicosis. Treating it can cost millions of dollars per person. Most of the medical costs are paid by Medicaid and other public assistance programs funded by American taxpayers.

Unfortunately, many fabrication workers don’t have access to healthcare – let alone specialists trained to diagnose and treat silicosis.Many big-box stores promote quartz over similar but much safer countertops manufactured from crushed glass; these are made from amorphous silica, which is much less toxic than crystalline silica. Consumers are generally not aware of the availability of this alternative.

Ikea stopped selling engineered stone countertops in 2025. Home Depot, Lowe’s and Costco are still selling crystalline silica products as of June 2026.Rising cases, emerging lawsuitsIn 2016, during the period one of us (David Michaels) served as the assistant secretary of labor for the Occupational Safety and Health Administration, or OSHA, the agency reduced the allowable level of workplace exposure to airborne silica dust.

Complying with the federal OSHA standard is not enough to protect workers from the extreme toxic effects of engineered stone.In 2019, after the Centers for Disease Control and Prevention reported 18 cases of silicosis from working with engineered stone across California, Colorado, Texas and Washington, epidemiologists in California began tracking the disease among fabrication shopworkers. Each year since, the number of cases was higher than the last.

It is clear that as long as crystalline silica-containing engineered stone is used to fabricate kitchen countertops, hundreds of young workers will be diagnosed with silicosis every year.In the U.S.

, cases of silicosis have been reported in several other states, including Massachusetts, Illinois, New York, Florida, Utah, Washington, New Mexico and Colorado. But since most fabrication workers are not tested for silicosis in the U.S.

, thousands more undiagnosed workers are undoubtedly suffering with it.Now, hundreds of sick workers across the U.S.

are suing manufacturers and distributors of these deadly countertops, as well as the big-box stores that sell them. Some of the early cases were settled out of court. In 2024, in the first case that went to trial, a 36-year-old worker with silicosis who underwent double lung transplantation while on life support was awarded US$52 million.

A growing global epidemicOutbreaks of silicosis have followed the introduction of engineered stone countertop production across the globe.Ca