Water filter guides

Last reviewed July 2026.

Every brand we track, plus the standards explainers. The certification pages check whether a brand's claim is in a public listing and which standards it covers; the ranking pages put a dollar figure on each certified gallon.

Start here: The best water filter for lead (and PFAS) — certified lead claims, by cost per certified gallon.

Cost per certified gallon

• Water filter pitchers — ranked by cost per certified gallon
• Refrigerator water filters — ranked by cost per certified gallon

Is it actually certified? brand by brand

• Is Berkey NSF certified?
• Is Brita NSF certified?
• Is Clearly Filtered NSF certified?
• Is Epic Water Filters NSF certified?
• Is Everydrop Whirlpool NSF certified?
• Is Grayl NSF certified?
• Is Katadyn NSF certified?
• Is LG NSF certified?
• Is Lifestraw NSF certified?
• Is Msr NSF certified?
• Is PUR NSF certified?
• Is Samsung NSF certified?
• Is Sawyer NSF certified?
• Is Waterdrop NSF certified?
• Is Zerowater NSF certified?

Does it remove lead? PFAS? Fluoride?

• Does Berkey remove lead?
• Does Brita remove lead?
• Does Clearly Filtered remove lead?
• Does Epic Water Filters remove lead?
• Does everydrop remove lead?
• Does Grayl remove lead?
• Does Katadyn remove lead?
• Does LG remove lead?
• Does LifeStraw remove lead?
• Does MSR remove lead?
• Does PUR remove lead?
• Does Samsung remove lead?
• Does Sawyer remove lead?
• Does Waterdrop remove lead?
• Does ZeroWater remove lead?
• Does Berkey remove PFAS?
• Does Brita remove PFAS?
• Does Clearly Filtered remove PFAS?
• Does Epic Water Filters remove PFAS?
• Does everydrop remove PFAS?
• Does LG remove PFAS?
• Does PUR remove PFAS?
• Does Samsung remove PFAS?
• Does Waterdrop remove PFAS?
• Does ZeroWater remove PFAS?
• Do water filter pitchers remove fluoride?

Head to head

• Brita vs PUR
• Brita vs ZeroWater
• PUR vs ZeroWater
• Berkey vs Brita
• Brita vs Clearly Filtered
• ZeroWater vs Clearly Filtered
• Waterdrop vs everydrop
• Waterdrop vs LG
• Waterdrop vs Samsung

Countertop reverse osmosis

• The best countertop reverse osmosis system, by certified claim
• AquaTru Classic vs Bluevua RO100ROPOT-Lite
• Countertop reverse osmosis cost calculator

Refrigerator filters by part number

• Samsung HAF-CIN (DA29-00020B) water filter: which fridges it fits, and is it certified?
• Samsung HAF-QIN (DA97-17376B) water filter: which fridges it fits, and is it certified?
• Samsung HAFCU1 (DA29-00003G) water filter: which fridges it fits, and is it certified?
• LG LT1000P water filter: which fridges it fits, and is it certified?
• LG LT800P water filter: which fridges it fits, and is it certified?
• LG LT700P water filter: which fridges it fits, and is it certified?
• LG LT600P water filter: which fridges it fits, and is it certified?
• LG LT500P water filter: which fridges it fits, and is it certified?
• Refrigerator water filters by part number

Standards & background

• NSF/ANSI 42 vs 53 vs 401: which one actually removes lead?
• Fake refrigerator water filters: how to spot one
• What "NSF certified" actually means (and doesn't)
• Are backpacking water filters NSF certified? All five big names, checked

We do not test filters — we index what accredited certifiers publish, with attribution, and make no health or treatment claims. A certification covers a specific model against a specific standard; it is not a general seal of quality. We are not affiliated with NSF International.

Some product links on this page are affiliate links: as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Affiliate status never changes a ranking or a verdict — full affiliate disclosure.