California’s silicosis prevention law now in effect

California’s Silicosis, Training, Outreach, and Prevention (STOP) Act, which was signed into law October 13 by Governor Gavin Newsom, is now in effect.

Silicosis, a severe and incurable, but preventable lung disease, is caused by breathing in respirable crystalline silica. The law aims to limit cases of silicosis by:

• Prohibiting dry cutting and grinding of stone countertops;
• Mandating employee training; and
• Classifying silicosis and silica-related lung cancer from artificial stone as a serious injury or illness.

Starting July 1, 2026, and annually thereafter, impacted employers must submit electronic attestation to Cal/OSHA confirming that all employees performing high-exposure trigger tasks have completed appropriate training as specified in Section 5204, Title 8 of the California Code of Regulations.