PFAS in Water
The short answer on pfas
In April 2024, EPA set the first enforceable federal PFAS limits — 4.0 parts per trillion each for PFOA and PFOS, with limits for PFHxS, PFNA, and GenX — so this went from "unregulated" to "highest-profile contaminant in America" overnight. Reverse osmosis (NSF/ANSI 58 with PFOA/PFOS claim) and large-capacity GAC or ion-exchange systems genuinely remove them; standard pitcher and fridge carbon fil… The details — sources, official limits and honest removal methods — are in the complete guide: The complete pfas guide.
How to remove pfas — what actually works
| Technology | Where it lives | What to demand on paper |
|---|---|---|
| NSF/ANSI P473 carbon block | Point-of-use or whole-house system per spec | Named NSF/ANSI protocol or third-party lab sheet for the exact model |
| GAC | Point-of-use or whole-house system per spec | Named NSF/ANSI protocol or third-party lab sheet for the exact model |
| RO / resin | Point-of-use or whole-house system per spec | Named NSF/ANSI protocol or third-party lab sheet for the exact model |
If a listing claims pfas reduction and cannot name the standard or show the lab sheet, assume it does not have one. That single check filters out most of the market.
Can your refrigerator filter handle pfas?
A certified carbon cartridge helps with this class — check the claim on your exact part number. Fridge cartridges are built for chlorine, taste and odor (NSF/ANSI 42), plus lead and cysts on certified 53 tiers. If pfas is your concern, keep the fridge cartridge for what it does well and put the right technology where you drink: see what your fridge model takes, then match the removal stage to the contaminant.
PFAS questions, answered straight
Does boiling water remove pfas?
Boiling is a concentration step, not a filter: water leaves as steam and whatever is dissolved stays behind, so levels rise by roughly the volume lost. The only heat-based method that works is distillation — capturing and condensing the steam. For pfas specifically, see the full guide.
Is my refrigerator water filter enough for pfas?
A certified carbon cartridge helps with this class — check the claim on your exact part number. Match the technology to the contaminant, not the badge on the box.
How do I find out my actual pfas level?
On city water, your utility's annual Consumer Confidence Report lists it free. On a well, a lab mail-in panel is the reliable route — the test-first card above links our guide to reading the results.
What removes pfas from drinking water?
The technologies with a track record for pfas: nsf/ansi p473 carbon block, gac, ro / resin. Claims worth having come with a named standard (NSF/ANSI protocol or third-party lab sheet) — buy where the certificate names the exact part number.
Go deeper
Every contaminant, one page each
48 water problems from EPA primary, secondary and unregulated lists — sources, official limits, and which filters actually work (and which honestly don’t). Browse the Water Problems A–Z →