Quartz Silica Safety: What Homeowners Should Know

Quartz silica safety is mainly about the people who cut the stone, not the people who live with it. Engineered quartz is made largely of crystalline silica, and cutting, grinding or polishing it without proper dust controls can expose workers to fine silica dust that causes silicosis and other serious lung disease. Manufacturers say a finished, installed quartz countertop is not a silica hazard in normal home use.

This topic has been in the news, and homeowners reasonably ask about it. Below I've kept to what OSHA, NIOSH and the quartz manufacturers themselves publish, with no guesswork. This is general information, not medical or legal advice. For the basics of how quartz is made, see our guide to what quartz countertops are.

What Is Crystalline Silica, and Why Is There So Much in Quartz?

Crystalline silica is a common mineral found in sand, rock and many building materials. Quartz is one of its most common forms. Engineered quartz countertops are made by binding ground quartz with resin and pigments, so the finished slab is mostly silica.

The 2026 hazard alert on countertop work from NIOSH and OSHA gives these typical ranges of crystalline silica content:

Material	Crystalline silica content
Engineered stone	Up to 95%, depending on the product
Granite	About 10% to 50%
Marble and limestone	Under 5%

The same alert notes that some engineered products now contain far less, and it lists choosing lower-silica or silica-free products as one way employers can reduce risk.

How Silica Dust Harms Workers: Engineered Stone Silicosis

The danger comes from respirable crystalline silica: particles small enough to be breathed deep into the lungs. They're produced when stone is cut, ground, drilled, edged or polished, especially with dry methods. According to NIOSH and OSHA, exposure can lead to silicosis, lung cancer, chronic obstructive pulmonary disease (COPD) and kidney disease.

Public health researchers have documented cases among countertop workers:

• A 2019 CDC report described 18 cases of silicosis, including two deaths, among stone fabrication workers in four states, and noted that engineered stone contains far more silica than natural stone.
• A 2023 study in JAMA Internal Medicine reported on 52 engineered stone workers with silicosis in California. Nearly all were Latino immigrant men, the median age at diagnosis was 45, 38 percent had advanced disease, and 19 percent died.

That's why regulators and manufacturers treat dust control in countertop fabrication so seriously.

What the OSHA Silica Standard Requires

OSHA regulates worker exposure through two respirable crystalline silica standards. Work in a fabrication shop generally falls under the general industry standard, 29 CFR 1910.1053. Work done on a job site, such as installation, generally falls under the construction standard, 29 CFR 1926.1153. The countertop hazard alert tells employers who manufacture, finish or install countertops to follow the standard that applies to them.

Key requirements include:

• An exposure limit. The permissible exposure limit is 50 micrograms of respirable crystalline silica per cubic meter of air, averaged over an 8-hour day, with an action level of 25 micrograms.
• Dust controls first. Employers must use engineering and work practice controls to keep exposure at or below the limit. Respirators supplement those controls where they're not enough or not feasible.
• A written exposure control plan describing the tasks that create dust and how exposure is controlled.
• Housekeeping limits. Dry sweeping and dry brushing are not allowed where they could add to exposure, unless wet sweeping, HEPA vacuuming and similar methods aren't feasible. Compressed air may not be used to clean clothing or surfaces unless it's paired with ventilation that captures the dust cloud or no alternative is feasible.
• Medical surveillance for workers who reach the thresholds each standard sets.

In September 2023, OSHA also began a focused inspection initiative aimed at engineered stone fabrication and installation, citing the high silica content of these products.

How the hazard alert says to control dust

The NIOSH and OSHA hazard alert points employers to a combination of controls:

• Wet methods that apply water where the dust is made, and avoiding dry cutting, grinding and sweeping
• Local exhaust ventilation that captures dust near its source
• Enclosures that separate workers from the dust
• Substitution with products that contain less or no crystalline silica

Some states have gone further. California, for example, updated its silica rules in December 2023 and February 2025 to add protections for workers who fabricate countertops.

Are Quartz Countertops Safe Once Installed?

The manufacturers say yes. In their own words:

• Caesarstone says its surfaces "are completely safe for domestic use" and that "silicosis is only an occupational disease resulting from ongoing, unprotected exposure of workers to silica dust."
• Cambria's safety data sheet states the product "is not hazardous in its finished/shipped form or as installed in a home or business."

The risk is tied to making dust, and wiping, cooking on or cleaning a countertop doesn't make dust. The same stone does release dust if someone cuts or grinds it later, which is why the next section matters.

What Homeowners Should Avoid

• Don't cut, grind or drill quartz yourself. Adding a faucet hole, enlarging a cooktop opening or trimming an edge creates the same kind of dust shop workers face. Hire a professional fabricator for any change.
• Plan cutouts before fabrication. Have your sink, faucet and cooktop chosen before templating so openings are cut once, as part of fabrication. Our installation guide explains the steps.
• Ask about safety when you hire. It's fair to ask any fabricator how they follow the OSHA silica standard. Our guide on how to choose a countertop fabricator lists other questions to ask.
• Leave demolition of old stone to the pros. Breaking out old granite or quartz can also create dust.

For more detail on silica and health, see the silica pages published by OSHA and NIOSH.

Low Silica Quartz: What Manufacturers Are Changing

Several quartz makers have reformulated their products to reduce crystalline silica content:

• Silestone (Cosentino) says all Silestone colors are made with its HybriQ technology and have "a low silica content (40% or less)," and that Silestone XM identifies products with 10 percent or less. Cosentino also states that Silestone "is safe to work with when the proper and established safety requirements are adhered to by fabricators."
• Caesarstone says its Mineral surfaces have crystalline silica content under 40 percent, in some cases under 10 percent, and that its ICON surfaces may contain traces under 1 percent.
• Cambria states that exposure to respirable crystalline silica in the stone industry "is entirely preventable through strict compliance with OSHA standards."

Lower silica content reduces the hazard during fabrication, but it doesn't eliminate it. The OSHA standard still applies. If a lower-silica product matters to you, ask about it when you compare colors; our quartz brands page lists the brands we carry.

Quartz Silica Safety: The Bottom Line

Quartz silica is a serious occupational hazard during fabrication, and it's regulated as one. For homeowners, the manufacturers say an installed countertop is safe in everyday use. The practical steps are to hire a fabricator who follows the OSHA silica standard, plan cutouts before fabrication, and never cut or grind quartz yourself. If you're still choosing a surface, our quartz vs marble and Corian vs quartz guides compare the options, or browse our quartz countertops and contact our team with questions.