S'well · Portable Water Bottles
S'well Stainless Steel Water Bottle 17 Ounces Celestial Green Triple
Low risk. Bare stainless steel unlikely to contain intentional PFAS.
S'well bottles are stainless steel without disclosed interior coatings or treatments. Stainless steel itself does not require PFAS additives for function.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, no interior coating disclosed
Lab data
No public lab test
What S'well Stainless Steel Water Bottle 17 is made of, ingredients and materials
S'well's 17 oz bottle uses 18/8 stainless steel (304-grade), a chromium-nickel alloy that does not require interior coatings or liners. This means no Teflon-type coating, epoxy, or phenolic resins that typically degrade under heat or scratching. Stainless steel is chemically inert in contact with water and beverages across normal use temperatures (freezing to hot liquids around 80-90°C), making leaching of metals or synthetic compounds unlikely under standard conditions.
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.
Stainless steel corrosion and nickel leaching
18/8 stainless steel can release trace nickel in acidic or salt-heavy conditions over extended contact, though amounts are typically far below regulatory limits for drinking water. Nickel-sensitive individuals should be aware, but this is not a product-specific defect.
Bacterial or mold growth in lid or seal
Like all reusable bottles, the threaded cap, gasket, and straw attachment (if included) can harbor bacteria or mold if not dried thoroughly. This is a maintenance issue, not a material hazard, but poor cleaning increases infection risk.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Rubber gasket/lid material
S'well does not disclose the composition of rubber seals or plastic lids. Silicone and thermoplastic elastomers are common; no recalls or known contamination is documented for this model, but materials are not independently tested or published.
Coating degradation on exterior or lid
The exterior Celestial Green finish (likely powder-coated or anodized) may chip or peel with heavy use. No lead or cadmium is expected in modern finishes, but chipped coating should be avoided as a hygiene measure rather than a toxicological concern.
The full breakdown
The brand's record and disclosure
S'well has not published extensive third-party testing data or formal certifications (BPA-free labeling, NSF, or similar) on their product pages, but the brand is transparent about the 18/8 stainless steel material. No recalls, contamination incidents, or regulatory actions are documented for this model. The company's parent company (Helen of Troy) operates within US consumer safety frameworks, though S'well does not issue detailed chemical or migration testing reports for retail transparency.
How it compares in its category
This is a beverage bottle, not a water filter (note, the product category given appears to be mislabeled). Among reusable drink bottles, stainless steel (especially uncoated 18/8) presents lower concern because it avoids the coating-failure and plastic-leaching risks of plastic or coated aluminum bottles. It is comparable in safety profile to other bare stainless bottles from brands like Klean Kanteen or Hydro Flask, though those brands often provide more detailed material certifications.
If you buy it
Hand wash or use mild dishwasher cycles to avoid damage to any rubber gasket or lid coating. Do not leave acidic liquids (lemon juice, vinegar) standing for prolonged periods, as chloride corrosion can occur on stainless steel over years of exposure, though this is rare with 18/8 grade. Replace the rubber seal if it shows cracks or mold growth. Stainless steel bottles are durable for 5+ years with normal care; no replacement needed unless denting occurs or lids fail.
What we don’t know
- Basis
- Model estimate, 78% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- S'well has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Portable Water Bottles
Klean Kanteen
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- 18/8 stainless steel, no interior coating
- The brand calls it PFAS-free, which we have not verified
- Cap or closure contamination
2 hazards checked on this product. See all of them.
Klean Kanteen
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- stainless steel body, foam insulation, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Cap gasket and seal contamination
Klean Kanteen
Classic Flip Seal Sport Cap
- Stainless steel bottle, plastic flip cap
- The brand calls it PFAS-free, which we have not verified
- Plastic cap degradation and microplastic shedding
3 hazards checked on this product. See all of them.
More portable 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.