The certification claims on replacement filters are checkable. So we check them.
Marketplaces are full of replacement filters that claim NSF certification. The certification databases are public. The Refill Report compares the claim on the listing to the record in the database, model by model, and publishes the full dataset every time.
15Certified for the exact model
14Brand certified, not this model
9No listing found
7Could not verify
Study 1, August 2026What percentage of refrigerator water filters sold online are counterfeit or fake?We checked all 45 best-selling fridge filters against the NSF, IAPMO R&T and WQA databases. 30 of 45 (67%) could not be confirmed certified for the exact model sold.Study 2, September 2026Has anyone independently tested refrigerator water filters for lead removal?Almost nobody. The only lab measurement is a 2018 trade-association study of counterfeits, and all 32 failed. No peer-reviewed OEM-vs-aftermarket comparison exists.Fitment indexWhich water filter fits your refrigerator?50 popular refrigerator models, the OEM filter each takes, and every compatible filter in our dataset with its verification status.How we workEvery claim checked against a public recordOur method, what we count as certified, and how affiliate links work on this site (only on filters we could verify).
Guides
- Is “meets NSF standards” the same as NSF certified?
- How to check whether a water filter is actually NSF certified
- NSF 42 vs 53 vs 401 vs 372 vs P473: what each standard means for a refrigerator filter
- Do refrigerator water filters remove lead?
- Which Samsung refrigerator water filter replacements are actually NSF certified?
- Which LG refrigerator water filters are actually NSF certified? (LT1000P, LT700P and replacements)
- Is the Whirlpool EveryDrop Filter 1 (EDR1RXD1) NSF certified?
- Are GE XWFE and RPWFE refrigerator filters NSF certified?
- Is Waterdrop NSF certified? What the databases show for each model
- Is AquaCrest NSF certified? The brand is. The best-sellers we checked are not.