Culligan · Refrigerator Filters
Culligan CUW1 Replacement Refrigerator Water Filter
Lower-concern choice; carbon filters don't inherently use PFAS, but Culligan doesn't disclose materials.
The Culligan CUW1 is a standard activated-carbon refrigerator filter, a material class with lower PFAS risk than nonstick coatings or water-repellent coating treatments. However, Culligan provides no public disclosure about filter composition, manufacturing, or PFAS testing.
Shop Culligan on Amazon →Material
activated carbon filtration media, 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 CUW1 uses activated carbon as its primary filtration medium, a highly porous form of carbon that traps chlorine, odor, and some organic compounds through physical adsorption rather than chemical binding. The housing is plastic (typically polystyrene or polypropylene), which sits inside a refrigerator at cold temperatures where leaching risk is minimal. No ceramic, enamel, or metal coating layers are involved, eliminating glaze-related lead/cadmium concerns common in other filter types.
The brand's record and disclosure
Culligan is a large, established water filtration company with NSF/WQA certifications on many products, though the CUW1 specifically is not prominently listed on their certification pages. The company does not publicly disclose detailed material composition or PFAS sourcing for this cartridge. No major recalls or leachate incidents on record for this model, and no published controversies regarding plastic housing off-gassing or carbon degradation claims.
How it compares in its category
Refrigerator replacement filters are largely interchangeable in material class: all use activated carbon in plastic housings, all operate at cold temperatures. The CUW1 is mid-market generic; premium alternatives (like certified NSF filters) may offer third-party verification of carbon quality, while cheaper knockoffs sometimes use lower-grade carbon or thinner plastic. Culligan's established supply chain and scale suggest consistent manufacturing versus very low-cost alternatives with variable production.
If you buy it
Replace every 6 months or per manufacturer guidance (typically 300 gallons filtered); delays increase bacterial regrowth risk in standing water. Store unopened filters at room temperature away from heat sources. Do not attempt to clean or reuse; activated carbon is single-use. Ensure the cartridge seats fully in the refrigerator's filter bay to avoid bypass leakage. If water tastes stale or develops odor, replace immediately rather than waiting for the timer.
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 from filter stagnation
All activated carbon filters can harbor bacteria if water sits unused or replacement intervals are missed. Culligan does not publish maintenance data specific to the CUW1, so adherence to 6-month replacement intervals is user-dependent.
Plastic housing leachables
Refrigerator filters operate at 35-45°F, a temperature regime where polystyrene and polypropylene leaching is minimal. No documented cases of BPA, phthalates, or other plastic additives migrating into water from the CUW1 housing have been published.
Carbon filter degradation and particulate shedding
Over time, activated carbon can fracture or shed fine particles into filtered water, particularly if water pressure is very high or if filters are overused past their stated capacity. Culligan does not disclose carbon quality standards (e.g., crush strength) for the CUW1.
Improper filter installation bypass
If the cartridge is not fully seated in the refrigerator bay, unfiltered water can bypass the carbon entirely. User error rather than product defect, but common and under-reported in safety literature.
Heavy metals in carbon feedstock
Activated carbon can occasionally contain trace arsenic, lead, or mercury if sourced from contaminated feedstock. Culligan does not publish heavy metal testing results for the CUW1; third-party NSF certification would verify these limits, but it is unclear if this model carries such certification.
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 Refrigerator Filters
Kenmore
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Lower-concern water filter; carbon-based design unlikely to contain PFAS, but Kenmore makes no explicit PFAS disclosure.
✓Verified PFAS-free by a third party
Kenmore
Pureline Filter Compatible with Whirlpool Everydrop Filter 1
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Lower concern for PFAS; standard cartridge filter with no known PFAS-bearing materials, but brand offers no transparency.
✓Bare metal or glass, no coating at all
Clearly Filtered
Water Pitcher Replacement Filter 3-Pack
Activated carbon and ion-exchange resin filter media
Lower-concern option; activated carbon filters are standard PFAS-reduction media, but verify pitcher durability and actual tested removal rates independently.
✓Brand claims PFAS-free (unverified)
More refrigerator 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.