In late 2023, California enacted an emergency temporary standard to address rising cases of silicosis among workers exposed to respirable crystalline silica — particularly those who cut, grind, or polish engineered stone. That emergency standard has now become permanent, taking effect in early 2025.
The driving force behind the rule is alarming: since 2019, hundreds of stone fabrication workers in California have been diagnosed with silicosis, an incurable and often fatal lung disease. A significant portion of these cases has affected younger workers, underscoring the seriousness of uncontrolled exposure.
Under the new regulation, employers working with engineered stone or natural stone containing more than 10% crystalline silica must implement comprehensive controls. These include engineering measures to reduce dust, mandatory respirators in high-exposure tasks, routine exposure monitoring, medical surveillance for affected employees, and a written exposure-control plan.
Stone shops must modernize their operations — such as switching to wet-cutting methods, improving ventilation, and ensuring workers use appropriate PPE. Housekeeping practices like dry sweeping or using compressed air are prohibited when they could create airborne dust.
The big picture: For employers, this regulation requires investment in safer equipment and stronger oversight of day-to-day processes. For workers in countertop fabrication, masonry, and similar trades, the rule provides vital, long-term health protections.