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PFAS filtration

Best under-sink filter for PFAS: certification first

EPA identifies activated carbon, ion exchange and reverse osmosis as technologies that can reduce PFAS. The critical step is verifying the exact product is independently certified for the PFAS claim you care about.

Updated September 8, 2026EPA-backed frameworkPoint-of-use focus
Decision framework

Three technologies can work

Activated carbon

Lower cost and no wastewater; effective when the exact product is certified for PFAS reduction.

Ion exchange

Can capture PFAS using specialty resin; cartridge capacity and certified claims matter.

Reverse osmosis

Broad contaminant reduction and strong PFAS potential, with higher cost and wastewater.

EPA guidance

Look for NSF/ANSI 53 or 58 for PFAS reduction

EPA recommends checking for certification to NSF/ANSI 53 or NSF/ANSI 58 specifically for PFAS reduction, and then confirming the product directory or performance sheet for the exact claim. A generic NSF badge is not enough.

Important: EPA notes that current PFAS filter certifications do not necessarily prove reduction all the way down to today's federal drinking-water limits. Maintenance and on-time cartridge replacement are also critical.
Best fit

When to choose carbon vs RO

If your utility reports only modest PFAS contamination and you can find a certified carbon or ion-exchange filter with acceptable capacity, that may be the simpler solution. If you also want broad dissolved-contaminant reduction, RO is usually the stronger fit.

Use our carbon vs reverse-osmosis guide to compare the tradeoffs.