Silicosis Crisis Grips U.S. Engineered Stone Industry

A severe and irreversible lung disease, silicosis, has affected hundreds of workers involved in fabricating engineered stone countertops across the United States. This health crisis has prompted discussions among regulators regarding potential bans on certain materials, alongside legislative proposals that would limit legal recourse for affected workers, and has led to numerous lawsuits against manufacturers and distributors.

Understanding Silicosis: A Resurgent Threat

Silicosis is a lung disease caused by inhaling crystalline silica dust, leading to irreparable scarring and impaired oxygen absorption. Historically associated with occupations such as mining, silicosis has seen a resurgence in the engineered stone countertop fabrication industry.

Engineered stone, also known as quartz, can contain up to 95% silica, significantly higher than natural stone, which typically contains 3% to 30%. The processes of cutting, grinding, or polishing engineered stone slabs generate fine dust that, even with water suppression, can become airborne and lodge deep in the lungs. Workers have developed the disease after as little as two years of exposure.

The Alarming Scale of the Health Crisis

Since 2019, California alone has identified at least 519 confirmed cases of engineered-stone-associated silicosis, with over 50 workers requiring lung transplants and at least 27 fatalities.

Nearly 500 workers have developed serious illnesses. The median age at diagnosis in California is 46, and at death is 49. Most affected individuals are reported to be Hispanic men, often in their 30s or 40s.

While silicosis is not a nationally reportable disease, cases have also been identified in other states, including Texas, New York, Colorado, Washington, Massachusetts, and Florida. The engineered stone industry employs approximately 100,000 people nationwide. In 2023, California public health officials estimated that up to 850 of the state's 4,000 stone fabrication workers could develop silicosis, with as many as 160 fatalities. California's estimated 12% worker illness rate approaches figures seen in Australia prior to its ban on high-silica engineered stone.

Regulatory Landscape and Compliance Hurdles

Regulatory bodies and health officials are debating responses to the crisis:

California Considers Ban and Implements Emergency Rules

Workplace safety regulators are discussing a proposed ban on cutting engineered stone with high silica content. The Western Occupational & Environmental Medical Association (WOEMA) has petitioned California's Occupational Safety and Health Standards Board for such a ban, citing the unacceptable number of new serious illnesses and deaths.

In late 2023, Cal/OSHA implemented temporary emergency rules mandating respirator masks and water-added processing for certain tasks and is developing permanent regulations. Despite stricter standards, compliance remains a significant challenge, especially among small and medium-sized fabrication shops. Alice Berliner, director of the Office of Worker Health & Safety for Los Angeles County Department of Public Health, reported observing no workers wearing appropriate respiratory protection during high-risk tasks in over a hundred visited shops and estimated that at least 25% of shops continue to dry-cut stone.

Federal Standards and Enforcement Concerns

The U.S. Occupational Safety and Health Administration (OSHA) has a silica standard, but it regulates crystalline silica broadly without differentiating between natural and high-silica engineered stone. Critics, including former OSHA director David Michaels, argue there are insufficient workplace inspectors to monitor compliance in thousands of shops, partly due to reported funding cuts. Researchers have measured unsafe silica levels even in shops with dust controls, according to Dr. Robert Blink, a specialist in work-related medical problems.

Legal Battles and Legislative Immunity Proposals

The crisis has generated extensive legal and legislative activity:

Hundreds of Lawsuits Filed Against Manufacturers and Distributors

More than 370 lawsuits are ongoing, filed by workers against engineered stone manufacturers, alleging failure to warn about risks or selling unsafe products. Cambria, a U.S. manufacturer, reported facing approximately 400 lawsuits from workers employed by other companies. Distribution companies, such as Natural Stone Resources, are also increasingly named in lawsuits for injuries related to cutting engineered stone, incurring significant defense costs and insurance challenges.

Controversial Bill Seeks to Shield Manufacturers

The "Protection of Lawful Commerce in Stone Slab Products Act" has been introduced in Congress, seeking to largely shield manufacturers and sellers of raw engineered stone slabs from liability for injuries.

• Arguments for the Bill: Supporters argue manufacturers should not be liable for injuries resulting from employers' non-compliance with OSHA standards. Gary Talwar, vice president of Natural Stone Resources, expressed a desire to refocus accountability on workplace safety and OSHA compliance.
• Arguments Against the Bill: Opponents, including Representative Hank Johnson (D-Ga.), questioned why Congress would grant legal immunity to manufacturers. David Michaels stated that removing litigation pressure would eliminate a key mechanism for driving product reform and called the proposed legislation a "death sentence for workers," asserting that without manufacturer and distributor obligation for product safety, silicosis cases would continue to increase.

"The stone slabs should be banned as they cannot be fabricated safely," stated attorney Raphael Metzger, criticizing the bill.

Industry Claims Versus Worker Advocacy

Manufacturers, including Cambria, assert that their quartz product is not the issue, but rather unsafe cutting processes employed by third-party fabricators. Rebecca Shult, Cambria's chief legal officer, stated that their own fabrication shops operate safely by controlling dust through ventilation and wet cutting techniques, demonstrating that quartz can be fabricated safely. Cambria attributes worker injuries to "reckless employers" violating safety laws and claims its facilities maintain exposures below OSHA limits.

Conversely, workers' advocates, physicians, and attorneys contend that materials composed almost entirely of crystalline silica may be inherently difficult to handle safely at scale. Dr. David Michaels compared industry claims to past statements regarding cigarette safety.

Global Responses and Industry Evolution

The challenges faced in the U.S. mirror experiences in other countries:

Physicians in Israel documented aggressive silicosis in young countertop workers as early as 1997. Following systematic CT-based screening in the late 2010s which revealed a high prevalence of the disease, Australia prohibited the manufacture, supply, and installation of engineered stone containing high levels of crystalline silica in 2024. This action has prompted manufacturers to develop lower- and zero-silica alternatives.

In response to global developments, major engineered stone brands like Caesarstone and Cosentino are introducing products with significantly lower silica content. Caesarstone US has launched products with less than 1% silica, while Cosentino states one-third of its portfolio contains less than 10% crystalline silica.