Williams Sonoma · Pizza Stones & Baking Surfaces
Williams Sonoma Pizza Steel, Is It Non-Toxic?
Lower PFAS concern, bare carbon steel requires no chemical coatings.
Plain carbon steel with no nonstick coating, water-resistant treatment, or chemical finish. No PFAS-containing materials are typically used in raw metal cookware, reducing concern than treated alternatives.
The better-graded swap
Deluxe Square Pizza Stone with Rack
90/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Carbon steel, uncoated
Lab data
No public lab test
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Is Williams Sonoma Pizza Steel non-toxic? What it is made of
Williams Sonoma's pizza steel is plain carbon steel with no applied coatings, enamels, or ceramic layers. Carbon steel is iron alloyed with small amounts of carbon and requires seasoning (oil buildup) to prevent rust and create a non-stick surface. Unlike non-stick cookware, there are no synthetic polymer coatings to degrade, flake, or release fumes when heated.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Iron leaching
Bare carbon steel can release small amounts of iron into acidic or very wet foods, especially if the seasoning layer is thin. This is generally considered nutritionally neutral to beneficial for most people, but those with iron-overload conditions (hemochromatosis) may wish to avoid frequent use.
Rust and corrosion
Improper drying or storage in humid conditions can lead to surface rust, which is cosmetic but can degrade the seasoning and potentially introduce loose iron oxide particles. Rust itself is not acutely toxic but indicates loss of protective seasoning.
Heavy metals
Carbon steel sourcing and purity are not disclosed by Williams Sonoma. Reputable steel suppliers maintain low chromium, nickel, and other heavy metal content, but third-party testing data is not publicly available for this specific product.
Source, FDA ↗What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Lead
This product has no applied enamel, glaze, or ceramic coating, so lead and cadmium contamination from coating materials is not a concern. The bare steel itself is not a source of these heavy metals.
Source, ATSDR ↗Teflon-type coating or non-stick polymer fume release
No synthetic non-stick coatings are present on this product. Overheating a seasoned carbon steel pizza steel does not release Teflon-type coating fumes or other toxic gases; it simply burns off seasoning oil.
How is this PFAS grade calculated?
The brand's record and disclosure
Williams Sonoma does not publicly disclose detailed material sourcing or chemical testing for this product category. The brand has no known recalls specific to pizza steels and no published stance on heavy metals or manufacturing contaminants. General Williams Sonoma cookware has faced no major safety controversies on record, though the company does not provide third-party safety certifications for most kitchen tools.
How it compares in its category
Uncoated carbon steel pizza steels have lower concern than ceramic or glazed stone alternatives because they avoid lead and cadmium in glazes and do not degrade into microparticles. They are simpler than non-stick surfaces (Teflon-type coating or ceramic coatings) and do not carry fume-release or coating-flaking risks. The main trade-off is that carbon steel requires active maintenance (seasoning and drying) to avoid rust, whereas some glazed or non-stick alternatives are more passive.
If you buy it
Season the steel before first use by rubbing with oil and heating to 400-450 degrees F for 10-15 minutes; repeat 2-3 times to build a protective oxide layer. Dry immediately after washing to prevent rust; do not soak or use steel wool. Replace if rust pitting becomes deep or surface becomes heavily pitted, as it may flake particles into food. Avoid acidic foods (tomato sauce, vinegar) on unsealed areas, as they can damage the seasoning and promote corrosion.
What is not known about PFAS in this product?
- Basis
- Model estimate, 88% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Williams Sonoma has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Williams Sonoma Pizza Steel?
15-Inch Ceramic Pizza Stone for Perfect Crispy Crusts
- Ceramic (clay-based baking stone)
- The brand calls it PFAS-free, which we have not verified
- Glaze degradation and surface leaching
3 hazards checked on this product, all on its full breakdown.
Deluxe Square Pizza Stone with Rack
- ceramic or unglazed stone; no nonstick coating
- The brand calls it PFAS-free, which we have not verified
- Ceramic or stone cracking and fragmentation
2 hazards checked on this product, all on its full breakdown.
More pizza stones & baking surfaces grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.