PFAS are persistent industrial chemicals increasingly detected in drinking water, and federal attention is rising fast. Here is what PFAS are, the health concerns, which filters actually reduce them, and how PFAS filtration qualifies for HSA/FSA.
Why it matters
A rising, documentable concern. With the EPA PFAS tightening federal limits, a documented PFAS detection is a solid basis for medically necessary filtration — with a Letter of Medical Necessity.
PFAS (per- and polyfluoroalkyl substances) are a large family of synthetic chemicals used in nonstick, waterproof, and stain-resistant products. They are nicknamed "forever chemicals" because they resist breaking down and accumulate in the environment and the body. They reach drinking water through industrial discharge, firefighting foam, and contaminated groundwater.
Regulators have linked PFAS exposure to a range of health concerns, and the EPA PFAS has moved to set enforceable limits for certain PFAS in public water systems — a significant change that has put PFAS firmly on the public agenda. For an HSA/FSA buyer, a documented PFAS result turns filtration into a defensible preventive measure.
Look for certification covering PFAS reduction, and confirm the specific compounds addressed.
In April 2024 the EPA finalized the first national drinking water limits for six PFAS, setting enforceable maximum contaminant levels for PFOA and PFOS at 4 parts per trillion each. As of 2026 the picture is evolving: the EPA has moved to keep the 4 ppt PFOA/PFOS limits while proposing to extend utility compliance deadlines to 2031, and has separately proposed rescinding the limits for four other PFAS. Because this is actively changing — and subject to litigation — check the EPA PFAS for the current standard rather than relying on a fixed figure.
What does not change for you: a documented PFAS detection in your water supports filtration as a reasonable health measure regardless of where the rulemaking lands.
Start with your utility — many now publish PFAS monitoring results, and federal testing of public systems has expanded. For a private well, or to confirm your own tap, use a certified laboratory test, since PFAS require specialized lab analysis rather than a strip test. A before/after test also tells you whether your filter is working.
Note what does not work: boiling concentrates PFAS rather than removing them, and standard sediment filters do nothing for them. Look for certification (such as NSF/ANSI 53 for PFOA/PFOS, or 58 for RO) confirming the specific compounds addressed.
Because the main PFAS exposure route from water is drinking and cooking, a point-of-use RO system covers the priority efficiently. A whole-house approach adds coverage where PFAS is widespread in the supply or where you want every tap addressed; the right answer depends on your test results and budget — see whole-house vs under-sink.
Address PFAS across the home or at the tap — eligible via the TrueMed checkout with a Letter of Medical Necessity.
See PFAS system → See whole-house filter →The pattern is the same as any contaminant: a provider documents the need based on your situation and a detection, issuing the Letter of Medical Necessity. Test first — see water test kits — then buy through a checkout that issues the letter. Educational only, not medical advice.
Yes, with a Letter of Medical Necessity. A documented PFAS detection supports filtration as a preventive health measure.
Reverse osmosis and high-quality activated carbon are effective for many PFAS, as are systems designed specifically for PFAS. Check certification for the specific compounds.
The EPA has moved to set enforceable limits for certain PFAS in public water systems. Check the EPA's PFAS resources for current standards.
