Contigo Wells 24 oz Stainless Steel Filtered Water Bottle in Salt, AUTOSPOUT Straw Lid, Leakproof, Cold-All-Day Insulat
Lower concern. Stainless steel and carbon filters unlikely PFAS sources.
Contigo makes no PFAS claims. Stainless steel body and activated carbon filter are generally lower-risk materials; plastic lid and straw composition remain unspecified.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, plastic lid/straw, activated carbon filter
Lab data
No public lab test
What Contigo Wells 24 oz Stainless Steel is made of, ingredients and materials
The Contigo Wells bottle body is 18/8 stainless steel, which is highly inert and does not leach metals into water under normal use. The lid and straw are BPA-free plastic (material type not specified in public documentation, but Contigo products typically use polyester or polypropylene). The activated carbon filter removes chlorine, odors, and some organic compounds but requires regular replacement to prevent bacterial biofilm growth and maintain effectiveness.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Bacterial growth in filter housing and straw
Activated carbon filters and narrow straws can harbor biofilm and mold if not replaced regularly or if moisture sits between uses. This is a maintenance-dependent risk, not a material defect.
Activated carbon filter effectiveness over time
Filters lose adsorption capacity and can become colonized by microorganisms if used beyond recommended replacement intervals. This is not a toxicity hazard but a functional safety and water quality issue.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Plastic lid and straw material degradation
Contigo does not disclose the exact plastic polymer used in the lid or straw. BPA-free designation is confirmed, but composition (polypropylene vs. polyester vs. other) is not publicly specified. No recalls or reported leaching from this bottle have been documented.
Lid gasket and seal durability
Contigo markets the bottle as leakproof; no widespread reports of seal failure or leachate from gasket material have surfaced. Gasket material type is not disclosed in available documentation.
The full breakdown
The brand's record and disclosure
Contigo does not publish detailed material safety documentation or third-party certifications on their website. The brand has not faced major recalls related to chemical leaching or material toxicity. Contigo markets the bottle as BPA-free and leakproof but remains silent on broader material sourcing transparency or independent testing. No significant controversies regarding water bottle safety have been associated with the brand in public records.
How it compares in its category
Stainless steel water bottles with integrated filters are considered lower-risk compared to plastic-bodied bottles or unfiltered options. The Contigo Wells sits in the mid-market tier; it is comparable to Hydro Flask and S'well in construction quality but lacks third-party certifications like NSF or FDA testing that some premium competitors highlight. Activated carbon filtration is standard in this category and poses minimal risk if cartridges are replaced every 2-3 months.
If you buy it
Replace the carbon filter cartridge every 2-3 months or after 40 refills, whichever comes first, to prevent mold and bacterial growth in the filter housing. Do not expose the plastic lid or straw to prolonged heat (dishwasher safe according to Contigo, but hand-washing extends longevity). Inspect the straw and lid seal monthly for cracks or discoloration; cracks can harbor bacteria. Rinse the bottle interior thoroughly before first use and periodically soak the filter compartment in a dilute vinegar solution to inhibit microbial buildup.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Contigo has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
More water filters 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.