Everything you need to know about filtering PFAS, PFOA, and PFOS from your drinking water
PFAS (per- and polyfluoroalkyl substances) are a group of man-made chemicals that have been used in industry and consumer products since the 1940s. Often called "forever chemicals," PFAS resist breaking down in the environment and can accumulate in the human body over time. These chemicals have been linked to serious health concerns including cancer, thyroid disease, immune system disruption, and developmental issues in children.
PFAS enter water supplies through industrial discharge, firefighting foam, landfill leaching, and wastewater treatment plants. The EPA estimates that over 200 million Americans have PFAS in their drinking water at detectable levels. Removing these persistent chemicals requires specialized filtration technology that goes beyond standard carbon filters.
PFAS is a broad category containing thousands of individual chemicals. The most well-studied and regulated are PFOA (perfluorooctanoic acid) and PFOS (perfluorooctanesulfonic acid). These were used for decades in non-stick cookware, waterproof clothing, food packaging, and stain-resistant products.
Other notable PFAS include GenX chemicals (developed to replace PFOA) and PFBS (perfluorobutanesulfonic acid). While industry has phased out some of the most persistent long-chain PFAS, shorter-chain replacements are still being studied for their health effects. The EPA's 2024 drinking water standards set maximum contaminant levels (MCLs) of 4 parts per trillion for both PFOA and PFOS.
Not all water filters can remove PFAS. The carbon filters found in pitchers and basic faucet attachments have limited effectiveness. The following four technologies are proven to reduce PFAS levels in drinking water:
Reverse osmosis (RO) systems are the gold standard for PFAS removal, achieving 99%+ reduction of PFOA and PFOS. RO works by forcing water through a semi-permeable membrane with pores as small as 0.0001 microns, physically blocking PFAS molecules along with other contaminants.
Activated carbon filters, particularly those using granular activated carbon (GAC) or catalytic carbon, can adsorb PFAS molecules onto their porous surfaces. Carbon filters are most effective at removing longer-chain PFAS like PFOA and PFOS, while shorter-chain variants like GenX may pass through.
Ion exchange systems use specially designed anion resins that attract and bind PFAS molecules. These systems are particularly effective for shorter-chain PFAS that may slip past carbon filters. Many whole-house systems are now incorporating ion exchange media specifically for PFAS removal.
Water distillers boil water and condense the steam, leaving PFAS and other contaminants behind. While highly effective, distillation is energy-intensive and produces water slowly (typically 3-6 gallons per day). The resulting water may taste flat due to the removal of beneficial minerals.
When shopping for a PFAS filter, NSF certifications are your assurance that a system has been independently tested and verified. Look for these specific certifications:
| System | Type | PFAS Removal | NSF Cert | Price Range | Best For |
|---|---|---|---|---|---|
| APEC ROES-50 | Reverse Osmosis | 99%+ | NSF 58 | $$$ | Under-sink drinking water |
| Aquasana OptimH2O | RO + Carbon | 99%+ | NSF 42, 53, 58, P473 | $$$$ | Claryum + RO combination |
| SpringWell RO | Reverse Osmosis | 99%+ | NSF 58 | $$$ | High-capacity under-sink |
| Pentair Freshpoint | GAC System | 95%+ | NSF 53, P473 | $$$ | Whole-house carbon |
| Home Master TMHP | RO + UV | 99%+ | NSF 58 | $$$$ | Well water with PFAS |
Before investing in a PFAS filtration system, it is wise to test your water. EPA-certified labs offer PFAS testing kits that typically cost $200-$500 and test for 20-40 different PFAS compounds. Some state health departments offer free or subsidized testing. For a more affordable option, at-home test strips can detect the presence of PFOA and PFOS but may not provide precise quantification.
If your water comes from a public utility, your Consumer Confidence Report (CCR) may include PFAS testing results. However, testing is not universally required, so a private test may still be necessary.
Reverse osmosis systems are the most effective, removing 99%+ of PFAS including PFOA and PFOS. For whole-house protection, a catalytic carbon system with NSF P473 certification is the best option. The Aquasana OptimH2O is our top recommendation as it combines both RO filtration and Claryum carbon technology with full NSF P473 certification.
Standard Brita pitcher filters using activated carbon have limited effectiveness against PFAS. While they may reduce some longer-chain PFAS by 20-50%, they are not NSF P473 certified and should not be relied upon for significant PFAS reduction. Brita's Elite filters show better performance but still fall short of dedicated PFAS filtration systems.
No, boiling water does not remove PFAS. In fact, because PFAS do not break down at boiling temperatures, boiling can slightly concentrate PFAS in the remaining water as some water evaporates. Only filtration technologies like reverse osmosis, activated carbon, ion exchange, or distillation can effectively remove PFAS from drinking water.
The only way to know for certain is to have your water tested by a certified laboratory. PFAS are odorless, tasteless, and invisible. If you live near industrial facilities, military bases, airports, or landfills, your risk of PFAS contamination is higher. Contact your local water utility for their testing data, or use an EPA-certified lab for independent testing.
Under-sink reverse osmosis systems provide the highest level of PFAS removal (99%+) and are ideal for drinking and cooking water. Whole-house activated carbon systems offer broader protection (all taps, showers, appliances) but typically achieve 90-95% PFAS reduction. For maximum protection, some homeowners install a whole-house carbon system combined with an under-sink RO unit for drinking water.