Drip · Faucet Water Filters
PUR Faucet Mount Water Filter System PFM400H
Lower concern for filter use, but PUR has not publicly disclosed PFAS-free filtration materials.
PUR faucet-mount filters use activated carbon, a well-established material without inherent PFAS risk. However, PUR does not publicly claim PFAS-free certification or disclose filter composition in detail. The plastic housing materials are undocumented.
Shop Drip on Amazon →Material
Activated carbon filter cartridge; plastic housing
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.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
The PFM400H uses a replaceable activated carbon cartridge as its core filtration medium, housed in plastic (material type not publicly specified by PUR/Drip). Activated carbon is a well-established, low-toxicity filtration material that adsorbs chlorine, taste, and odor. The plastic housing itself poses minimal leaching risk under normal faucet-mount conditions since water passes through briefly and at low temperature, but cartridge degradation and bacterial colonization inside the filter cavity are the primary concerns over time.
The brand's record and disclosure
PUR (owned by Helen of Troy) has not publicly disclosed whether its activated carbon or housing materials contain or are treated with PFAS. The brand maintains NSF/ANSI Standard 42 and 53 certifications for chlorine and some contaminant reduction, which are third-party verified but do not specifically address PFAS in the product itself. No major safety recalls or controversies specific to the PFM400H have been publicly reported.
How it compares in its category
Faucet-mount filters like this sit at the convenience end of the water filtration spectrum and generally carry lower chemical exposure risk than pitcher or under-sink systems because contact time and water volume are lower. PUR's activated carbon approach is mainstream and comparable to Brita and other consumer brands. However, faucet-mount systems require more frequent cartridge replacement (typically every 3 months) than pitcher filters, meaning higher plastic waste and greater maintenance discipline to prevent bacterial growth.
If you buy it
Replace cartridges every 2-3 months or sooner if flow slows, as stagnant filters become bacterial incubators. Do not use with hot water above 100F (faucet-mount housings are not designed for heat stress). Flush the filter housing with tap water for 5 seconds before first use. Keep the filter dry between uses if possible to reduce microbial colonization; some users report musty odors if the system sits unused for weeks.
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.”
Bacterial growth in filter cartridge if maintenance is neglected
Activated carbon filters can harbor bacteria if not replaced regularly or if the system remains wet and unused for extended periods. This is a known issue with faucet-mount systems across the category, not specific to PUR, but depends entirely on user replacement discipline.
Plastic housing leachables under temperature stress
PUR does not specify the plastic resin in the housing. No documented leaching issues have been reported for the PFM400H under normal faucet-mount use, but exposing it to hot water beyond the manufacturer's range could theoretically degrade polymers.
Activated carbon dust or particle shedding into drinking water
Well-manufactured activated carbon cartridges shed minimal particles into water. NSF certification (which PUR holds) includes testing for this. No reports of visible dust or particle contamination in the PFM400H exist in public record.
Cartridge filter material degradation over time
Activated carbon filters lose effectiveness as they saturate with contaminants. PUR recommends 3-month replacement, but extending use beyond that reduces filtration performance rather than introducing acute chemical hazards.
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.
Safer alternatives in Faucet Water Filters
Aquasana
Under Sink Water Filter 2-Stage Filtration Reduces up to 99.99% of Pfas
Activated carbon, ion exchange resin cartridges
Lower-concern filter type, but claim lacks third-party lab proof, verify independently before relying on it.
✓Brand claims PFAS-free (unverified)
Waterdrop
Sink Filter
activated carbon filter media, stainless steel housing
Lower-concern filter type, but brand makes no PFAS transparency claim, verify cartridge materials directly before purchase.
✓Bare metal or glass, no coating at all
Waterdrop
Filtered Water Faucet
stainless steel faucet body; activated carbon/ion-exchange filter cartridge
Lower-concern choice; water filter design avoids high-risk PFAS applications, but brand transparency on materials could be stronger.
✓Bare metal or glass, no coating at all
More faucet 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.