Zojirushi · Insulated Travel Drinkware
Zojirushi 27 oz. Stainless Mug/Water Bottle with Lid Handle
Lower concern. Bare stainless steel has minimal PFAS risk.
Zojirushi stainless steel drinkware contains no intentional nonstick or water-resistant coatings known to require PFAS. Standard stainless steel and plastic lid present lower PFAS concern for beverage containers.
Shop Zojirushi on Amazon →Material
Stainless steel interior and exterior, lid with handle
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
This mug uses food-grade stainless steel (typically 18/8 or 18/10 alloy) for both interior and exterior walls, which is chemically inert and does not leach metals into beverages at normal use temperatures. The lid likely contains polypropylene (PP) or polyacetal (POM) plastics and a silicone gasket. Unlike ceramic-coated or non-stick metal drinkware, bare stainless steel avoids risks from degraded coatings or polymer breakdown.
The brand's record and disclosure
Zojirushi is a Japanese appliance manufacturer with a long history in thermal drinkware and is not known for major product safety controversies or recalls affecting their water bottles or mugs. The brand does not publicly disclose detailed material certifications or test reports for this specific product, but stainless steel drinkware from established manufacturers typically undergoes standard food-contact compliance testing. No regulatory actions or widespread complaints regarding leaching or toxins have been documented for Zojirushi stainless mug lines.
How it compares in its category
Stainless steel water bottles are among the safest drinkware options available, with no coating degradation risk unlike ceramic-lined or powder-coated alternatives. This product sits in the mid-to-premium tier of stainless bottle construction and is comparable to brands like Hydro Flask or Klean Kanteen in material safety profile, though without explicit third-party certification statements. Plastic lids carry minimal risk at normal use temperatures but are less inert than the bottle itself.
If you buy it
Hand wash the lid and gasket regularly to prevent bacterial growth in crevices, and inspect the silicone seal annually for cracks or discoloration. Do not expose the lid plastics to prolonged boiling or dishwasher heat above 140F, as this can degrade POM or PP over time. The stainless steel bottle itself is durable and will not degrade; replace only if denting compromises insulation. Avoid storing acidic beverages (lemon water, vinegar) for extended periods, as even stainless can show minor surface etching with prolonged contact.
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.”
Lid and gasket material degradation (polypropylene/polyacetal/silicone)
Plastic lid components and silicone gaskets can degrade over years of use, especially with exposure to heat cycles or UV light. While polypropylene and polyacetal do not readily leach BPA (they contain neither), old gaskets may develop cracks that harbor bacteria if not maintained.
Bacterial growth in lid seams and gasket
If the lid is not disassembled and cleaned regularly, water can stagnate in the seal area between the lid and gasket, creating a microenvironment for mold or bacterial growth. This is not a material hazard but a maintenance failure.
Stainless steel leaching under acidic conditions
Food-grade stainless steel is highly resistant to corrosion and leaching. No established risk of nickel or chromium release into neutral or slightly acidic beverages has been documented for standard stainless drinkware under normal use.
Off-gassing or odor from lid plastics
New polypropylene or polyacetal lids may emit a mild plastic smell when first used, particularly if exposed to hot water. This typically resolves within days to weeks and does not indicate a safety hazard; it is outgassing of volatile residues from manufacturing.
Coating or enamel hazards
This product has no ceramic coating, powder coat, or enamel on the interior or exterior. All contact surfaces are bare stainless steel, which eliminates risks from lead, cadmium, or coating flaking.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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.
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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.