ZeroWater · Filtered Water Bottles
ZeroWater 500ml Stainless Steel Bottle
Lower concern for bottle itself, but filter composition opacity prevents higher confidence.
The stainless steel bottle container carries lower PFAS risk inherent to the material. However, ZeroWater makes no public disclosure about PFAS in the filter cartridge itself, a common concern for water filters using ion-exchange resins or activated carbon.
Shop ZeroWater on Amazon →Material
Stainless steel bottle; filter composition not specified by brand
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
No PFAS disclosure
No public statement about PFAS in this product.
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
The full breakdown
What it's made of and why it matters
The ZeroWater 500ml bottle uses food-grade stainless steel as its primary vessel, which is chemically inert and does not leach metals or compounds into water under normal use. Stainless steel (typically 18/8 or 304-grade) does not degrade from water contact, temperature cycling, or acidic beverages. The bottle's interior coating and cap materials are not specified by the brand, but stainless steel itself poses no established leaching risk for lead, cadmium, aluminum, or BPA.
The brand's record and disclosure
ZeroWater is primarily known for its filter cartridges and pitcher systems marketed around total dissolved solids reduction. The brand has not published detailed material safety data sheets, third-party certifications (NSF, FDA compliance statements), or responses to product safety inquiries on record. No recalls or safety controversies have been documented for this bottle model. The opacity around filter composition and cartridge disposal protocols remains a disclosure gap.
How it compares in its category
Stainless steel bottles are among the safest in the filtered bottle category, avoiding plastic leaching risks entirely. Most competitors (Brita, PUR, LifeStraw bottles) use plastic housings and are subject to more scrutiny around BPA and microplastics when heated or degraded. ZeroWater's 500ml size and claimed filter performance position it as a premium option, though the filter cartridge composition and replacement frequency are not transparently disclosed compared to some competitors.
If you buy it
Use the bottle at room temperature or cold only; stainless steel bottles can become scalding if filled with boiling water due to thermal conductivity. Replace filter cartridges on the schedule ZeroWater recommends (typically every 2-3 months depending on water quality) to avoid bacterial growth or filter saturation. Do not use abrasive scrubbers on the interior, as they may damage any interior coating. Rinse thoroughly after refilling and allow to air dry between uses to prevent mold in the cap seal.
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.”
Filter cartridge composition and leachables
ZeroWater does not publicly disclose the exact materials in its filter cartridges (ion exchange resins, carbon media, binders, housing). Potential for leached manufacturing residues or resin particles into water is not independently verified. Brand silence on filter composition prevents confident assessment.
Cap and seal materials (not specified)
The bottle cap material is not disclosed; if plastic, it could contain BPA or phthalates, or if silicone, may off-gas under temperature stress or cleaning. Without material specification, risk cannot be ruled out but is typical for this product category.
Bacterial growth in filter or dead space
Any filtered bottle can harbor bacteria in the filter housing or cap threads if not cleaned regularly or if cartridges are not replaced on schedule. ZeroWater filters may create stagnant zones if not used daily or stored with standing water. Risk is manageable with proper maintenance.
Stainless steel bottle interior degradation
Food-grade stainless steel (304/18-8) does not pit, rust, or leach under normal potable water use. No documented failures of this product type. Longevity is typically 5-10 years with normal care.
Teflon-type coating or non-stick coatings on interior
Stainless steel bottles typically do not use Teflon-type coating or non-stick coatings. If any coating is present, brand has not disclosed it, but this is unlikely given the material choice and intended use temperature range.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 62% 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.
More filtered 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.