S'well Review, Is S'well Non-Toxic?
S'well averages 83 out of 100 on PFAS Authority's PFAS and toxin screen across the 28 S'well products graded as of October 2026, and all 28 reach its 70 point pass mark.
S'well grades Excellent on our four-band scale.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
What S'well says and does about PFAS
S’well publishes nothing about PFAS. Its only materials and safety answer covers stainless steel, BPA and California Proposition 65 compliance, and a search of its own site returns product listings rather than any PFAS statement. Where it does name a gasket material it names silicone, on its glass bottle line. No Proposition 65 notice has been filed against the brand and we found no independent testing of its drinkware.
- Brand statementS’well says its products are made of 18/8 food-grade stainless steel that does not need a liner, that they are BPA-free, and that they comply with California Proposition 65 and FDA food contact rules. The answer does not mention PFAS or any coating chemistry. S’well ↗
- MaterialsOn its glass bottle line S’well names the lid gasket as silicone, which is not a fluorinated polymer. It does not state the gasket material for its insulated drinkware. S’well ↗
Sources checked October 1, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.
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Does S'well have PFAS, by category
Which S'well products are PFAS-free? Good or better, best-graded first
- Double-wall 18/8 stainless steel
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- Stainless steel vacuum-insulated walls; BPA-free plastic lid
- Plastic lid material unspecified, S'well does not publicly name the resin or additives in the BPA-free lid.…
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- Stainless steel double-wall vacuum insulation; BPA-free plastic flip-straw cap
- Cap plastic composition and leaching. The flip-straw cap material is not disclosed by S'well despite BPA-free…
3 hazards checked on this product, all on its full breakdown.
- Stainless steel bottle with polypropylene lid and flip straw
- Polypropylene lid degradation. Prolonged exposure to hot beverages or UV light can cause PP to soften…
2 hazards checked on this product, all on its full breakdown.
- Double-wall stainless steel (18/8)
- Lid gasket and seal degradation. Rubber seals in the cap can accumulate mold or crack over time if not dried…
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- Stainless steel exterior, internal water filter (carbon/ion-exchange)
- BPA & bisphenols, S'well does not disclose whether filter housings, binders, or ion-exchange resin coatings…
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- Stainless steel bottle with food-grade plastic cap
- Microplastic shedding from heated plastic. Polypropylene caps can degrade under sustained high heat (above…
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- Stainless steel body with plastic lid
- Plastic lid degradation and silicone gasket wear. Polypropylene lids and silicone gaskets are durable but…
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- stainless steel with proprietary insulation layer
- Insulation layer chemical composition (unknown). The proprietary insulation material is not disclosed; it may…
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- Double-wall stainless steel (primary container material)
- Silicone/plastic gasket degradation. Lid gaskets and cap seals are typically food-grade silicone but S'well…
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- Stainless steel with plastic cap/lid components
- BPA & bisphenols, S'well does not disclose the polymer type or chemical composition of cap and lid…
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- Recycled stainless steel, no coating disclosed
- Bacterial growth in seams or caps. The bottle's gasket, lid interior, and seams may harbor bacteria if not…
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- stainless steel, silicone seals
- Silicone seal degradation. Silicone seals degrade with age, heat cycles, and UV exposure. Compromised seals…
2 hazards checked on this product, all on its full breakdown.
- 18/8 stainless steel interior and exterior, plastic lid components
- BPA & bisphenols, S'well does not disclose the specific plastic resin or additive chemistry of the lid. While…
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- Stainless steel body, no interior coating disclosed
- Stainless steel corrosion and nickel leaching, 18/8 stainless steel can release trace nickel in acidic or…
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- Stainless steel double-wall vacuum insulated
- Nickel leaching from stainless steel, 18/8 stainless contains 8% nickel. While FDA-approved for food contact…
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- Stainless steel exterior, insulated
- BPA & bisphenols, S'well states products are BPA-free, but independent lab confirmation of all interior…
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- Stainless steel with plastic lid components
- BPA & bisphenols, S'well does not disclose lid polymer type or BPA-free status; most commodity polypropylene…
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- Stainless steel body, plastic/silicone lid and cap
- Silicone/plastic lid bacterial growth and contamination. The plastic or silicone lid and cap can harbor…
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- Stainless steel double-wall with plastic lid and straw
- BPA & bisphenols. Polypropylene lids and straws may contain trace additives (including plasticizers or UV…
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- stainless steel, plastic lid/seals
- Plastic lid/seal composition not disclosed, S'well does not publicly specify the polymer type or additives in…
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- Stainless steel and glass
- Metal leaching (aluminum, nickel, chromium). Stainless steel 18/8 is food-approved, but nickel and chromium…
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- Activated carbon and coconut shell filter media
- Bacterial growth if unmaintained. Activated carbon filters create high-surface-area environments for…
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- stainless steel body, silicone gasket
- Silicone gasket composition and additives. The gasket material is not publicly specified by S'well. While…
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- Double-wall stainless steel with plastic lid and straw
- Plastic lid and straw thermal stability. Commodity plastic lids and straws can soften, leach, or shed…
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- Stainless steel body, plastic handle and cap
- Plastic cap/handle thermal migration. Polypropylene handles and caps may release trace amounts of oligomers…
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- Stainless steel double wall with vacuum insulation
- BPA & bisphenols. The bottle cap is made of plastic, and S'well does not publicly specify the resin type or…
What to buy instead Good or better, in the categories S'well sells
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Klean Kanteen
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3 hazards checked on this product, all on its full breakdown.
- borosilicate glass
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- Stainless steel container, no surface treatment
- Lid/gasket polymer leaching
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S'well and PFAS, common questions
- Does S'well have PFAS?
- S'well averages 83 out of 100 on PFAS Authority's PFAS and toxin screen across the 28 S'well products graded as of October 2026, and all 28 reach its 70 point pass mark. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests. S’well publishes no PFAS statement. Its materials answer covers stainless steel, BPA and Proposition 65 compliance only, and it does not disclose interior coating or powder coat chemistry. It names silicone as the gasket material on its glass bottle line.
- Is S'well non-toxic?
- S'well Stainless Steel Water Bottle is the highest-graded S'well product we have scored, at 100/100. It depends on the product line rather than the brand, so check the grade of the exact item you are buying.
- Which S'well products are lower concern for PFAS?
- The highest-graded S'well products we have scored are S'well Stainless Steel Water Bottle, S'well bottle 17 oz White - Unique Design - 1 bottle You Choose, S'well 17oz Water Bottle With Flip Straw Cap. That is our model-based estimate from materials and public disclosure, not a lab test.
Every grade uses the same public rubric. How grades work →