The engineered stone sector in the United States is facing significant regulatory and legislative shifts as federal and state authorities intensify measures to protect workers from respirable crystalline silica (RCS) dust. The developments of June 2026 highlight intense institutional activity, directly impacting the global supply chain and the surface materials market.
Legislative Initiative in Congress Regarding Civil Liability
On June 3, 2026, the US House Judiciary Committee approved federal bill H.R. 5437 by a 16-7 vote. This specific legislative proposal aims to limit lawsuits against major manufacturers and importers of engineered stone slabs.
Proponents of the bill argue that the primary responsibility for compliance with health and safety regulations lies with local fabrication and cutting shops, which are required to implement wet cutting methods. Conversely, critics of the proposal express concerns, emphasizing that the measure could restrict legal recourse and compensation options for workers already diagnosed with silicosis.
Cal/OSHA: Moving Towards an Emergency Ban on High-Content Materials
At the state level, California continues to lead in strict regulations. Following the Safety and Health Standards Board (OSHSB) meeting in late May, Cal/OSHA began drafting an Emergency Temporary Standard (ETS) during June.
This standard aims for a comprehensive ban on the manufacturing, processing, and installation of engineered stone products containing crystalline silica in excess of 1% (notably, traditional engineered stone often contains levels exceeding 80-90%). This move partially aligns with the “Australian Model,” where the use of these materials has already been banned.
Intensification of Inspections and OSHA Findings
Meanwhile, data from OSHA’s federal targeted inspection program analyzed this month indicate that market compliance remains a challenge:
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Permissible Exposure Limit Violations: Nearly 20% of air samples in selected workplaces exceeded the legally permissible limit for silica exposure.
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Lack of Medical Surveillance: It was found that a significant percentage of small and medium-sized businesses fail to implement the mandated preventive medical surveillance programs for their personnel.
The Day After: STOP Act and Market Implications
Starting July 1, 2026, the next phase of the STOP Act comes into effect, requiring industry businesses to submit official verifications of worker training regarding the hazards of silica dust.
