S'well · Filtered Water Bottles
S'well bottle 17 oz White - Unique Design - 1 bottle You Choose
Lower concern, stainless steel core is PFAS-resistant, but lid material not publicly detailed.
S'well bottles use double-wall stainless steel construction, which is inherently resistant to PFAS use. The brand does not disclose PFAS information or claim PFAS-free status.
Shop S'well on Amazon →Material
Stainless steel vacuum-insulated walls; BPA-free plastic lid
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
No PFAS disclosure
No public statement about PFAS in this product.
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
The full breakdown
What it's made of and why it matters
S'well bottles use 18/8 food-grade stainless steel (chromium and nickel alloy) for the vacuum-insulated walls, which is chemically inert and resistant to corrosion and leaching at normal use temperatures. The lid is plastic and branded BPA-free, though the specific polymer type (polypropylene, tritan, or other) is not publicly detailed by the brand. Stainless steel vacuum bottles have no coating to degrade, eliminating the risk of ceramic glaze leaching or Teflon-type coating degradation seen in some cookware. The design relies on mechanical insulation rather than chemical additives, reducing chemical exposure pathways.
The brand's record and disclosure
S'well has made no public statement on PFAS testing or content in any component, which is typical of many premium drinkware brands but falls short of transparency leaders like Klean Kanteen or Hydro Flask (which publish third-party test results). No recalls or contamination incidents are recorded in FDA or CPSC databases for this product line. The BPA-free claim is stated but not independently certified by a third-party standard (e.g., NSF, FDA approval letter). The brand does not disclose the polymer resin used in the lid or whether it contains other endocrine disruptors like BPS.
How it compares in its category
Stainless steel vacuum bottles are among the safest water container options because they eliminate leaching entirely, unlike plastic-lined alternatives or bottles with nonstick coatings. S'well sits in the premium lifestyle segment; comparable alternatives like Hydro Flask and Klean Kanteen offer similar construction but with more detailed material specifications and third-party testing published online. Many budget stainless steel bottles (Contigo, Thermoflask) offer identical core materials at lower cost, though they often have less refined lids and insulation. S'well's main differentiator is aesthetics and brand positioning, not material safety advantage.
If you buy it
Wash the lid by hand or in the top rack of the dishwasher to extend seal longevity; the lid's plastic components may degrade faster than the steel body if exposed to extreme heat or harsh detergents. Do not fill with boiling water immediately before capping, as thermal stress can warp the lid seal over time. Replace the lid gasket or lid assembly every 2-3 years of regular use, as silicone seals harden and lose grip. Avoid prolonged storage of acidic beverages (citrus, vinegar) against the interior walls, though stainless steel is resistant; residues can eventually pit the surface if never cleaned.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Plastic lid material unspecified
S'well does not publicly name the resin or additives in the BPA-free lid. If the polymer is polycarbonate-derived or contains bisphenol S (BPS) as a replacement, low-level migration is possible with hot liquids, though risk is reduced by avoiding boiling water immediately before capping.
Nickel leaching from stainless steel
18/8 food-grade stainless steel (typical in S'well) is engineered to resist nickel release under normal use. No reported cases of nickel contamination from S'well bottles exist in public databases. Risk is negligible unless the bottle is damaged or exposed to highly acidic liquids for extended periods.
Lid gasket degradation
Consumer reports on S'well forums and review sites note that silicone gaskets can harden, crack, or lose seal integrity after 2-3 years of regular washing and temperature cycling. Degradation is a functionality issue (leaking) rather than a toxicity risk, but suggests the need for periodic replacement.
Bacterial growth in vacuum chamber or lid crevices
Stainless steel itself is resistant to microbial colonization, but the lid's threads and gasket crevices can trap moisture and harbor bacteria if not dried thoroughly between uses. This is a maintenance issue, not an inherent material defect. Regular disassembly and air-drying of components mitigates this.
Heavy metals in exterior finish (if any applied coating)
S'well does not coat the exterior or interior with paint, lacquer, or ceramic. The white color in this model likely refers to powder-coated exterior or anodized finish options, but the brand does not disclose lead or cadmium content of any finish. No reported incidents in public records.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 75% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More filtered water bottles 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.