Not all filters remove PFAS. Here is exactly which technologies work, what certifications to look for, and how to choose the right filter for your situation.
PFAS contamination affects roughly 45% of US tap water. But not every filter removes PFAS — in fact, most popular filters do almost nothing. This guide tells you exactly which filter technologies work, which certifications to look for, and how to match the right solution to your specific situation.
PFAS compounds are extremely stable — that's the same property that makes them persist in the environment. They are dissolved in water at very low concentrations (parts per trillion), which means physical size-based filtration alone is not sufficient. Effective PFAS removal requires either adsorption (binding to filter media) or physical exclusion through an extremely tight membrane.
RO membranes remove PFAS by physical exclusion — the membrane pores are too small for PFAS molecules to pass through. NSF 58-certified RO systems remove 94-99%+ of PFAS compounds including PFOA, PFOS, PFBS, GenX, and others. This is the most comprehensive and well-documented PFAS removal technology for home use.
Look for: NSF/ANSI 58 certification with specific PFAS compounds listed in the reduction claims. Not all RO systems are certified for PFAS — verify the specific listing.
High-quality activated carbon filters — specifically solid carbon block filters certified to NSF 53 or NSF 244 — can remove significant amounts of PFAS through adsorption. The effectiveness varies by PFAS compound, carbon contact time, and filter design.
The Clearly Filtered pitcher uses a high-capacity activated carbon block and is independently certified to remove 99%+ of PFAS compounds. Several under-sink carbon block systems (Aquasana, Berkey) also show strong PFAS reduction. Look for NSF 244 certification, which specifically covers PFAS.
Specialized ion exchange resins designed for PFAS removal are highly effective in municipal treatment plants and are becoming available in home systems. Some newer under-sink systems incorporate PFAS-specific ion exchange media alongside activated carbon.
Boiling is particularly important to address: boiling water does not remove PFAS. It concentrates PFAS as water evaporates, making the remaining water more contaminated, not less.
Enter your ZIP code on WaterCheckup to check your utility's PFAS testing results from the EPA's UCMR5 monitoring program. If you are on well water, you need a certified lab test — well water is not included in the EPA monitoring data.
Enter your ZIP code to see live EPA data, PFAS results, and violation history for your specific water system.
Check My Water Free →