The best NSF 401 certified water filter depends on your refrigerator model: Waterdrop UKF8001 filters suit a range of Whirlpool, Maytag, and other listed models, while the Waterdrop HAF-CIN filter is made for compatible Samsung refrigerators. The Waterdrop 644845 filter is listed for BORPLFTR10, not BORPLFTR20. A Waterdrop pitcher is included for comparison, but its supplied details list NSF/ANSI 42 and 372—not NSF/ANSI 401—so it does not meet this article’s certification criterion.
| Product | Best For | NSF/ANSI 401 |
|---|---|---|
| Waterdrop UKF8001, 3 Pack | Compatible refrigerators; three-filter bundle | Listed as certified |
| Waterdrop Samsung HAF-CIN, 3 Pack | Compatible Samsung refrigerators | Listed as certified |
| Waterdrop 644845, 3 Pack | Compatible BORPLFTR10 refrigerators | Listed as certified |
| Waterdrop UKF8001, 2 Pack | Compatible refrigerators; two-filter bundle | Listed as certified |
| Waterdrop PT-07B Pitcher | Pitcher users seeking everyday filtration | Not listed as certified |
Waterdrop UKF8001 Three-Pack
Best for: Households with a compatible refrigerator that want three replacement filters in one purchase. The listed models include UKF8001, UKF8001P, EveryDrop Filter 4, EDR4XD1, and several Sears, Kenmore, Bosch, and Viking model numbers. Check the complete compatibility list before ordering.
The product details say the filter is certified against NSF/ANSI 401, 53, 42, and 372. NSF/ANSI 401 targets certain emerging compounds; the listing names phenytoin, naproxen, estrone, and bisphenol A. It also describes reductions involving lead, benzene, mercury, PFOA, and PFOS. Waterdrop is an independent brand, not the original refrigerator brand.
Limitation: It is not a universal refrigerator filter. Avoid it if your exact filter model is not listed as compatible.
Waterdrop Samsung HAF-CIN Three-Pack
Best for: Owners of refrigerators that use the Samsung HAF-CIN filter and want a multi-filter bundle. The listing says this model is certified by NSF and IAPMO against NSF/ANSI 401, 53, 42, and 372.
The stated NSF/ANSI 401 reductions include bisphenol A, phenytoin, estrone, ibuprofen, and naproxen. The product information also reports reductions for lead, benzene, and mercury under NSF/ANSI 53, plus tested reduction of PFOA and PFOS. These are product-listing claims; verify the exact certification and replacement model for your refrigerator.
Limitation: Compatibility is specific to the HAF-CIN format. Choose another option if your refrigerator calls for a different filter model.
Waterdrop 644845 Three-Pack
Best for: Buyers whose refrigerator uses BORPLFTR10 and who want a three-filter set. The supplied details explicitly state that this product replaces BORPLFTR10, not BORPLFTR20, making model verification especially important.
The listing reports certification against NSF/ANSI 401, 53, 42, and 372. Its stated NSF/ANSI 401 reductions include bisphenol A, phenytoin, estrone, ibuprofen, and naproxen. Other listed claims cover lead, benzene, mercury, and additional substances under the stated standards.
Limitation: Do not select it for a BORPLFTR20 system based on the similar model numbers; the listing says it is not that replacement.
Waterdrop UKF8001 Two-Pack
Best for: Owners of compatible UKF8001-series refrigerators who prefer a two-filter bundle. Listed replacement models include UKF8001, EveryDrop Filter 4, EDR4XD1, and other Whirlpool, Maytag, Amana, Sears, Kenmore, Bosch, and Viking identifiers.
The product details state certification against NSF/ANSI 401, 53, 42, and 372. They identify reductions for phenytoin, naproxen, estrone, and bisphenol A under NSF/ANSI 401, and list other tested or certified reductions. The housing is described as BPA-free and food-grade, and the filter uses coconut-shell carbon.
Limitation: This is an independent-brand replacement, so confirm the refrigerator’s required filter number rather than relying on brand name alone.
Waterdrop PT-07B Filter Pitcher
Best for: People seeking a pitcher for everyday drinking water in a kitchen, apartment, dorm, or office. The listed capacity is 10 cups. Product details say it passed NSF/ANSI 42 and 372 certifications and was third-party tested for reduction of PFOA/PFOS, odor, iron, mercury, copper, and other metal ions.
Important distinction: The supplied information does not list NSF/ANSI 401 certification for this pitcher. It is therefore not a match for shoppers who specifically require an NSF 401 certified filter. The listing also says it does not lower TDS and identifies PF-01A as its replacement filter.
Buying Guide: How To Choose An NSF 401 Water Filter
Does NSF/ANSI 401 certification match your needs?
NSF/ANSI 401 addresses reduction of certain emerging compounds in drinking water. The compounds covered can differ by product. Read the model’s certification details to confirm which substances are included rather than assuming every NSF 401 filter reduces the same set.
Will the filter fit your refrigerator?
Start with the model number printed on the existing cartridge or listed in your refrigerator manual. Compare it with the replacement list. Similar-looking numbers can indicate different filters, as the 644845 listing’s BORPLFTR10 and BORPLFTR20 warning illustrates.
Should you buy a two-pack or three-pack?
Choose based on how many replacement cartridges you want to keep available, not on certification alone. The UKF8001 two- and three-packs list the same broad compatibility family, while bundle size differs. Follow the refrigerator maker’s replacement instructions.
What other standards or substances should you check?
Some listed products also cite NSF/ANSI 42 for aesthetic effects, 53 for certain health-related contaminant reductions, and 372 for lead-content requirements. These standards have different purposes. Check the exact product’s certification and stated reduction claims, especially if you are targeting a particular contaminant.
Frequently Asked Questions
What does NSF/ANSI 401 mean on a water filter?
It indicates certification for reduction of certain emerging compounds, with the specific substances depending on the filter model. Check the product’s certification listing for the exact claims.
Are all refrigerator water filters NSF 401 certified?
No. Certification varies by model. Confirm NSF/ANSI 401 for the exact filter you plan to buy.
Can I use a UKF8001 replacement in any refrigerator?
No. It is intended for listed compatible models. Match the replacement number to your refrigerator’s required filter.
Is the Waterdrop PT-07B pitcher NSF 401 certified?
The supplied product information lists NSF/ANSI 42 and 372, but not NSF/ANSI 401. It should not be treated as an NSF 401 option based on those details.
Does NSF 401 certification mean a filter reduces every contaminant?
No. Certification applies to defined claims and substances. Check the filter’s documentation for the exact contaminants and reduction standards.