Both warehouse clubs sell some of the safest cookware on the market — and some of the most actively litigated. This is the brand-by-brand teardown: who actually makes Kirkland, who makes Member's Mark, what's in the HexClad set on the endcap, and which colors of Le Creuset come with manufacturer-disclosed cadmium.
Safest picks at either warehouse (in order): Tramontina tri-ply stainless (Sam's), Kirkland Signature 5-ply Clad (Costco — also Tramontina-made), Lodge cast iron (both), Le Creuset white/cream/blue interior (Costco), GreenPan Valencia Pro / Padova Pro / Reserve (Costco).
Avoid or treat with caution: HexClad legacy hybrid (active class-action settlement), Le Creuset bright red/orange/yellow exterior (manufacturer-disclosed cadmium glaze), Member's Mark Hard Anodized (PTFE despite the brand halo), Kirkland Hard Anodized Nonstick (PTFE), Ninja Foodi NeverStick (PTFE), Carote (claimed-safe but unverified).
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Costco has the strongest non-toxic cookware lineup of any US warehouse retailer — but it also moves more HexClad than any single chain. The split is real, and the labels don't tell you which side a product is on.
Costco's house-brand 5-ply clad is manufactured by Tramontina — the same company that supplies the famous "ATK best budget pick" tri-ply at Sam's Club and Walmart. Bare 18/10 stainless interior, no PTFE, no PFAS, no enamel. Consumer Reports has reviewed this set favorably. The single safest cookware buy at any warehouse.
Costco rotates Le Creuset Dutch ovens — usually the 5.5qt or the giant 166-piece "Ultimate" set. Stick to white, cream, oyster, or Marseille blue. Le Creuset's own AB1200 disclosures admit cadmium-pigmented enamel in red, orange, and yellow exteriors (sealed under anti-acid frit, but real). For interior food contact, all colors are within Prop 65 limits.
Costco runs All-Clad D3 set configurations not available at All-Clad.com — the 13-pc and 21-pc bundles are warehouse-exclusive. Same tri-ply construction as the standard D3 line, same factory, same safety profile. No coating, no enamel, no leach pathway.
Costco carries 14+ GreenPan SKUs — more than any other US retailer. The Thermolon ceramic coating is silicon-dioxide-based, no PTFE, no PFOA, no detectable PFAS per the Ecology Center's 2022 "What's Cooking" report. Caveat: GreenPan stopped publishing fresh third-party reports in 2020. Older verification, current production unverified. Plan to replace any ceramic-coated pan every 1-2 years regardless.
Costco's Lodge SKUs include the 11" classic skillet, the lighter Blacklock line, and the Chef Collection 2-piece. Tamara Rubin has tested Lodge plain cast iron repeatedly since 2015 — consistently lead-free, cadmium-free, mercury-free, arsenic-free. The cheapest entry point in the entire safe-cookware category.
Costco's nonstick house-brand uses a DuPont-supplied PTFE coating. PFOA-free, but PTFE itself is classified as a PFAS by California and most independent toxicologists. Some newer Kirkland nonstick saute SKUs are now marketed as "PFAS-free" — likely a ceramic reformulation. Check the label on the specific SKU before buying. Oven-safe only to 400°F.
HexClad is Costco's most-promoted cookware brand and also the subject of an active class-action settlement. Cliburn v. HexClad settled for $2.5 million in February 2025; final approval March 9, 2026. HexClad agreed to stop advertising the legacy hybrid line as "non-toxic" or "PFAS-free." Anyone who bought a HexClad set at Costco between Feb 1, 2022 and Mar 31, 2024 is in the eligible class.
Le Creuset's bright warm-color exteriors contain manufacturer-disclosed cadmium pigments per California AB 1200 disclosures. Lead Safe Mama XRF testing has measured 11,900–12,800 ppm cadmium on red exterior surfaces. Sealed under anti-acid frit, but if the glaze chips or cracks the cadmium-containing layer becomes accessible. Within Prop 65 leach limits as a finished product. The simplest fix is to buy a non-warm color and remove the question entirely.
Sam's Club's hero cookware is the same Tramontina tri-ply that has been America's Test Kitchen's "Best Budget" pick for years. Their Member's Mark line is more complicated — some of it is also Tramontina, some is PTFE with a brand-name halo.
The hero product. Wirecutter's "Best Overall Cookware Set" 2023-2025 and the longtime America's Test Kitchen budget pick. Same tri-ply chemistry as All-Clad at less than a third the price. NSF certification covers material safety and migration. No coating, no PFAS, no leach pathway. The single best non-toxic cookware buy at Sam's Club.
Per Sam's Club's own brand disclosures, Member's Mark tri-ply stainless cookware and Dutch ovens are made by Tramontina USA Inc. — functionally identical construction to the Tramontina-branded set on the next aisle. Buy whichever is cheaper that week.
Marketed PTFE/PFOA/PFOS-free with a sol-gel ceramic coating. Plausibly true based on construction, but no published independent third-party testing on file. Treat as a 1-2 year consumable like every ceramic-coated pan. Honest framing: safer than PTFE, but we'd like to see Mamavation or Lead Safe Mama lab data before upgrading the verdict.
Sam's Club rotates Lodge cast iron in warehouse, not always online. Same product as everywhere else — bare seasoned iron, no coating, no failure mode that ends with throwing the pan away. Lifetime cookware.
Despite the Member's Mark halo, this set explicitly uses Teflon Platinum — a DuPont/Chemours PTFE coating. PFOA-free, but PTFE is itself a PFAS. Standard nonstick safety profile, no better than a $40 T-Fal under the chemistry.
Same product as Costco. Same $2.5M Cliburn v. HexClad class-action settlement (final approval March 2026). HexClad has agreed to stop advertising the legacy hybrid line as "non-toxic" or "PFAS-free" — but the product is still on shelves and still being sold to people who don't know about the lawsuit.
Ninja markets NeverStick as PFAS-free, but the coating is PTFE — the same family-of-PFAS contradiction that sank HexClad's marketing in court. No active litigation yet, but the marketing language is in the same risk zone. Reasonable nonstick performance; questionable claim integrity.
Carote is primarily an Amazon and Walmart brand, occasionally surfacing at Sam's. Markets "PFAS-free" with mineral-fleck coating, but the coating is PTFE-based with mineral fillers. SGS migration testing exists but the marketing is misleading. No major Mamavation / Lead Safe Mama / Tamara Rubin verdict published yet.
If you put the safest house-brand cookware from each warehouse next to each other and stripped the labels, you would be looking at almost the same pan.
Costco's Kirkland Signature 5-Ply Clad: made by Tramontina.
Sam's Club's Member's Mark Tri-Ply: made by Tramontina USA Inc. (per Sam's own brand-manufacturer disclosures).
The Tramontina retail set sold under its own name at Sam's, Walmart, and Amazon: made by Tramontina (Brazil), the same company.
This is not a conspiracy. Tramontina is one of the largest cookware manufacturers in the Western Hemisphere. Both Costco and Sam's source private-label tri-ply from the same supplier because there are not many factories in the world that build NSF-certified fully-clad stainless at warehouse-club price points. The construction is genuinely good. The chemistry is genuinely safe. The brand name is the only thing that's different.
If you see one of these on sale and not the other, buy the cheaper one. They are the same pan.
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Sam's Club has a real product affiliate program through Impact Radius (~2% commission, 3-day cookie), and we are working on getting on it. Until that's live, the same products generally exist on Amazon under the same SKU.
Where a product is genuinely warehouse-exclusive (Costco's All-Clad 21-pc bundle, Member's Mark ceramic), we link to the closest equivalent on Amazon and tell you it's an equivalent — never the same SKU. Read the warning under each link.
We never recommend a pan because of an affiliate relationship. The unsafe ones are linked because if you already own one, you should be able to recognize it on the list.
Tramontina (Brazil and Italy, depending on the line). The Kirkland 5-Ply Clad and the longstanding Tramontina-branded retail tri-ply share construction and supplier. Consumer Reports has reviewed the Kirkland 5-ply favorably.
Three different manufacturers depending on the line, per Sam's Club's own brand disclosures: Tramontina USA Inc. for tri-ply stainless and Dutch ovens, Import-Master Group Global for the hard-anodized aluminum and ceramic sets, and Velong Enterprises for griddles. The tri-ply is the safest and the one with the strongest pedigree.
HexClad's legacy hybrid line settled a $2.5 million class-action lawsuit in February 2025 (Cliburn v. HexClad) over false advertising — the company marketed the cookware as "non-toxic" and "PFAS-free" while the recessed hexagons contained PTFE, a member of the PFAS chemical family. The settlement requires HexClad to stop using those marketing claims. We rate the legacy hybrid line Avoid. The new "TerraBond" ceramic line has only manufacturer-paid testing and is too new to verdict. Full investigation →
No. The Member's Mark 15-pc Hard Anodized set explicitly uses "PFOA-free Teflon Platinum," which is a PTFE coating from DuPont/Chemours. PFOA-free is not the same as PFAS-free — PTFE is itself a PFAS. The chemistry is identical to a $40 T-Fal under the brand halo.
The 166-pc set in Marseille blue is a reasonable buy if you actually need that much cookware and bakeware. Le Creuset's interior enamels meet Prop 65 across all colors. The exterior cadmium issue is specific to bright red, orange, and yellow finishes — Marseille blue is the lower-risk colorway and the safer choice.
Substantially yes. Same manufacturer (Tramontina, Brazil), same NSF certification, same tri-ply construction. The Sam's Club exclusive 14-pc set and the Walmart 12-pc set differ in piece count (one extra pot and lid) but the chemistry is identical. The 14-pc is Wirecutter's current "Best Overall" pick.
Sometimes. The Costco All-Clad 21-pc and the 166-pc Le Creuset Ultimate are real bundle savings vs. open-stock pricing. The HexClad sets generally are not — the per-piece price is similar to direct-from-HexClad. Always check the per-piece price on warehouse cookware bundles, especially with HexClad and Calphalon, before buying for the discount.