ZeroWater Tumbler, Portable Filtration, 26 Ounce
No coating of concern recorded, and no PFAS statement from the brand.
The brand has published no PFAS statement for this product that we could find.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Tritan copolyester tumbler with carbon/ion-exchange filter media
Lab data
No public lab test
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What ZeroWater Tumbler, Portable Filtration is made of, ingredients and materials
The ZeroWater Tumbler uses Tritan copolyester, a BPA-free plastic engineered to resist heat and degradation better than standard polycarbonate. The tumbler itself does not have a coating; water contacts only the plastic walls and the carbon/ion-exchange filter media inside. Tritan has no known leaching issues at typical drinking temperatures and is widely used in reusable drinkware because it does not break down into microplastics under normal use conditions.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Bacterial growth in filter media if unmaintained
Carbon and ion-exchange resins can harbour bacteria if water sits stagnant or filters are not replaced on schedule. This is a general risk for all activated-carbon filters and is mitigated by following ZeroWater's replacement timeline (every 2 months or 40 gallons).
Mineral or taste residue if filter not primed
First use without priming the filter (rinsing it thoroughly) may result in activated-carbon dust or off-flavours in the first few servings, not a safety hazard but a quality issue.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Microplastics
Tritan copolyester is engineered to resist microplastic shedding under normal drinking and cleaning conditions. No published studies or recalls have linked ZeroWater Tumblers to microplastic leaching.
Source, EPA ↗Filter media leachables or off-gassing
ZeroWater's carbon and ion-exchange media are standard food-grade materials used across the industry. No documented leaching of VOCs or heavy metals has been reported for this product line.
Housing leachables from Tritan
Tritan is specifically formulated to avoid BPA and does not leach plasticizers or endocrine disruptors at normal use temperatures. No heavy metals or harmful additives are known to be present in ZeroWater's Tritan formulation.
The full breakdown
The brand's record and disclosure
ZeroWater has not publicly committed to reducing PFAS in manufacturing or published third-party test results for this product line. However, no PFAS coating or treatment has been documented on this tumbler model, and the brand's filter-focused business model does not depend on water-repellent surface treatments. The company is known for promoting reduced TDS (total dissolved solids) rather than PFAS reduction specifically, which is a narrower claim but does not indicate a safety problem.
How it compares in its category
This tumbler sits in the mid-tier of portable water filtration. Unlike pitcher filters, it combines the vessel and filter in one unit, reducing the risk of bacterial colonization in separate storage. Compared to metal tumblers with internal carbon filters, Tritan offers visibility of filter life and slightly easier cleaning. Most competitors in this space (Brita, Clearly Filtered portable models) use similar materials and have not disclosed PFAS risks, making this product representative of the category norm.
If you buy it
Replace the filter cartridge every 2 months or after 40 gallons (whichever comes first per the manual) to prevent bacterial regrowth in spent media. Do not use boiling water or hot beverages above 60C; Tritan is stable but not designed for sustained heat exposure. Rinse the tumbler and filter well before first use. Store with the filter in a dry location and do not leave standing water in the filter chamber for more than a few days, as stagnant conditions can promote microbial growth even in carbon media.
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
- ZeroWater has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
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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.