Health information, not medical advice. Guidance differs for infants, pregnancy, and existing conditions. Test your own water and speak to a doctor or your local health authority. We may earn a commission when you buy through our links; it never affects our scores.
Does reverse osmosis remove PFAS?
Yes. Reverse osmosis removes most PFAS from drinking water: EPA research says RO membranes are typically more than 90% effective across a wide range of PFAS, including the shorter-chain kinds that carbon handles less well. But a PFAS claim is optional under the RO standard, so not every system is certified for it. If PFAS is your reason for buying, choose a system whose certifier listing names PFOA/PFOS or Total PFAS.
How does reverse osmosis remove PFAS?
An RO membrane lets water molecules through under pressure and holds back most dissolved substances, which are flushed to the drain. PFAS molecules are far larger than water molecules, so the membrane rejects most of them. Home RO systems also have carbon stages before and after the membrane, which adsorb PFOA, PFOS, and other longer-chain PFAS. The two together are why RO does well on PFAS. See how reverse osmosis works.
How much PFAS does reverse osmosis remove?
Most of it. EPA researchers describe high-pressure membranes, including RO, as extremely effective at removing PFAS, typically above 90%. In a 2020 study of 76 home filters, researchers at Duke University and NC State found that every under-sink RO system cut PFAS, including GenX, by 94% or more. Carbon pitcher, faucet, and fridge filters in the same study removed 73% on average, with results ranging from all PFAS to none.
A certified system has to meet a fixed target, not a percentage. NSF International says a filter must reduce PFAS to below 20 parts per trillion to make a PFAS reduction claim.
Which reverse osmosis systems are certified for PFAS?
These are the RO systems we’ve checked, with the PFAS claim on each certifier’s listing:
| System | Type | Certified by | PFAS claim |
|---|---|---|---|
| AquaTru Carafe | Countertop | IAPMO R&T | PFOA/PFOS |
| AquaTru Classic | Countertop | IAPMO R&T | PFOA/PFOS |
| Waterdrop G3P800 | Under-sink | IAPMO R&T | PFOA/PFOS |
| Aquasana SmartFlow RO | Under-sink | WQA | PFOA/PFOS |
| Culligan Aquasential RO | Under-sink, dealer-installed | WQA | Total PFAS, with the Total Defense cartridge |
| APEC RO-90 | Under-sink | WQA | None |
| iSpring RCC7AK-BN | Under-sink | NSF International | None; the PFAS figure is iSpring’s own |
In each of these systems, the PFAS claim is listed under NSF/ANSI 53, the standard that also covers carbon filters, alongside the system’s NSF/ANSI 58 listing for reverse osmosis. Check the exact model and cartridge: Culligan’s Total PFAS claim applies only with its Total Defense cartridge.
What’s the difference between PFOA/PFOS and Total PFAS claims?
A PFOA/PFOS claim covers those two compounds, the most studied PFAS and the two the EPA limits at 4 parts per trillion. A Total PFAS claim covers a longer list of PFAS compounds. If your water report shows only PFOA and PFOS, either claim fits. If it shows others, such as PFHxS, PFNA, or GenX, look for Total PFAS or a listing that names them. See our PFAS guide for how to read your water report.
Does a certified RO system get PFAS below the EPA limit?
Certification doesn’t prove that yet. The PFAS claims under NSF/ANSI 53 and 58 were written before the EPA set its 4 ppt limits in 2024, and NSF International says its committees are working on updates to match the EPA rule. The EPA has said the same: Current filter certifications don’t yet show that a filter removes PFAS to the levels it set. Research results like the Duke and NC State study suggest RO gets close to complete removal, but if your water is high in PFAS, test the filtered water to be sure.
Is reverse osmosis better than carbon for PFAS?
For a wider range of PFAS, usually. EPA research says carbon works well on longer-chain PFAS like PFOA and PFOS, but shorter-chain PFAS such as PFBS and PFBA don’t adsorb as well. RO membranes remove both. In the Duke and NC State study, two-stage carbon filters also reached 94% or more, though the researchers tested only a few.
Certified carbon filters are a good choice when PFOA and PFOS are your main concern and you want no wastewater or power. The Aquasana AQ-6300M under-sink filter, for example, is certified for PFOA/PFOS. Our best water filters for PFAS compares both kinds.
How do you keep an RO system removing PFAS?
Replace every filter on schedule, not only the membrane. Because the PFAS claim on these systems is certified under NSF/ANSI 53, it depends on the carbon cartridges as well as the membrane, and each cartridge is certified only up to its rated capacity. The Duke researchers also warned that filters left in too long can perform worse. A TDS meter tells you roughly when the membrane is wearing out, but it can’t measure PFAS; only a lab test can.
Which reverse osmosis systems do we recommend for PFAS?
Ranked by our overall score. Each is certified for PFAS by the certifier named in its pick. How we score
| # | System | Score | Certified by | Lead | PFAS | Fluoride | Running cost | Price |
|---|---|---|---|---|---|---|---|---|
| 01 | AquaTru CarafeBest overall, no plumbingCountertop RO | 4.6 | IAPMO R&T | Certified | Certified | Certified | $0.33/gal | $356.25on Amazon › |
| 02 | AquaTru ClassicBigger countertop batchesCountertop RO | 4.5 | IAPMO R&T | Certified | Certified | Certified | $0.17/gal | $451.25on Amazon › |
| 03 | Waterdrop G3P800Best under-sink, tanklessUnder-sink RO | 4.3 | IAPMO R&T | Certified | Certified | Certified | About $160/yr | $849.00on Amazon › |
| 04 | Aquasana SmartFlow ROUnder-sink with remineralizerUnder-sink RO | 4.1 | WQA | Certified | Certified | Certified | $0.49+/gal | $239.99on Amazon › |
| 05 | Culligan Aquasential ROCertified for Total PFASUnder-sink RO | 3.9 | WQA | Certified | Certified | Certified | Dealer-priced | Get a quoteat Culligan › |
Certified: Certified by an independent body (named in each pick). Lab test: Tested by a named independent lab, not certified. Claim: The maker's claim, not certified. No: No claim. PFAS means PFOA/PFOS, or Total PFAS where the pick says so.
Common questions
Does reverse osmosis remove 100% of PFAS?
Not always. EPA research puts RO membranes at typically more than 90%, and the under-sink RO systems in the Duke and NC State study reached 94% or more. Certified systems must bring PFAS below 20 ppt under NSF International’s current claims.
Does reverse osmosis remove GenX?
In the Duke and NC State study, under-sink RO systems reduced PFAS including GenX by 94% or more.
Does reverse osmosis remove short-chain PFAS?
Yes. EPA research says RO membranes remove a wide range of PFAS, including shorter-chain ones like PFBS and PFBA that carbon doesn’t adsorb as well.
Does a Brita or PUR pitcher remove PFAS?
The PUR PLUS filter is certified for Total PFAS by IAPMO R&T. Brita says its Elite filter reduces PFOA and PFOS, but we found no certifier listing for that claim. See PUR vs Brita.
Does boiling water remove PFAS?
No. Boiling doesn’t break PFAS down, and as water evaporates, it can concentrate them.
Does remineralized RO water add PFAS back?
No. Remineralizing stages add calcium and magnesium after the membrane. They don’t add PFAS.
Sources
- EPA: Reducing PFAS in drinking water with treatment technologies
- EPA: Identifying drinking water filters certified to reduce PFAS
- NSF International: PFAS in drinking water
- Herkert et al., Environmental Science & Technology Letters (2020): Point-of-use filters and PFAS
- EPA: PFAS National Primary Drinking Water Regulation
- IAPMO R&T product listing directory (AquaTru, Waterdrop)
- WQA certified product listings (Aquasana, Culligan, APEC)
- NSF International listings (iSpring)
Prices as of October 14, 2026. Product prices and availability are accurate as of the date/time indicated and are subject to change. As an Amazon Associate we earn from qualifying purchases.