PFAS "forever chemicals" are in 45% of U.S. tap water. They do not break down. They accumulate in your body. And conventional water treatment does not remove them. Here is what you need to know — and what actually works.
PFAS — per- and polyfluoroalkyl substances — are a family of over 15,000 synthetic chemicals that have been manufactured and used in industrial and consumer products since the 1940s. They are found in non-stick cookware, water-resistant clothing, food packaging, firefighting foam, and hundreds of other products.
What makes PFAS uniquely dangerous is the carbon-fluorine bond at their core. It is one of the strongest bonds in organic chemistry — so strong that neither the human body nor the natural environment can break it down under normal conditions. This is why they are called "forever chemicals." Once they enter your body, they accumulate in your blood, liver, kidneys, and thyroid. Once they enter the environment, they persist indefinitely.
The contaminant landscape is also evolving rapidly. As regulatory attention has focused on well-known PFAS like PFOA and PFOS, manufacturers have introduced newer variants — PFBS, GenX, and others — that may carry similar risks but face less regulatory scrutiny. The EPA only began regulating PFAS in drinking water in April 2024. The word "microplastics" didn't exist in scientific literature until 2004. Both are now in your tap water. These are not legacy contaminants with decades of safety data — they are emerging threats the regulatory system is still catching up to.
In 2023, the U.S. Geological Survey conducted the most comprehensive national PFAS study to date and found detectable PFAS in an estimated 45% of U.S. tap water samples — including both public water supplies and private wells. Detection rates were highest in urban and suburban areas and near industrial sites.
The Environmental Working Group has estimated that over 200 million Americans receive water from systems with PFAS levels above 1 part per trillion — the threshold toxicologists consider the minimum level of concern. In April 2024, the EPA finalized the first-ever enforceable maximum contaminant levels (MCLs) for six PFAS compounds, setting limits as low as 4 parts per trillion for PFOA and PFOS.
The health effects associated with PFAS exposure are serious and well-documented. The EPA classified PFOA and PFOS as human carcinogens in 2024. Research has linked PFAS exposure to:
Kidney and testicular cancer
Thyroid disease and disruption
Immune system suppression
Elevated cholesterol
Liver damage
Developmental disorders in children
Reduced vaccine effectiveness in children
Pregnancy complications
No. Because PFAS are non-volatile, they do not evaporate when water is heated. Boiling actually concentrates PFAS — as water evaporates, the PFAS remain behind in a smaller volume of water, increasing their concentration. Refrigerator filters, standard pitcher filters, and basic faucet-mount filters are also generally ineffective. The NSF has certified very few pitcher or faucet filters for PFAS reduction, and those that are certified typically achieve only partial removal.
Standard activated carbon — the media in most residential filters — achieves roughly 1,000–1,200 m²/g of surface area. PFAS molecules are large, complex organic structures. Standard carbon physically cannot trap them with sufficient reliability because the pore geometry is not engineered for molecules of that size and polarity.
This is the critical gap in most "PFAS-reducing" filter marketing. A filter that claims to "reduce" PFAS using standard activated carbon may achieve 40–60% removal — leaving a meaningful fraction of PFAS in your water. For a Group 1 carcinogen with no safe level of exposure, partial removal is not the standard you should be accepting.
Three technologies have been proven effective for PFAS removal. They are not equivalent — and the differences matter significantly at the whole-house level.
MOF/COF Adsorption Media
Most AdvancedMetal-Organic Framework (MOF) and Covalent Organic Framework (COF) technology represents a fundamental advance over activated carbon. AION's PFAS stage uses MOF/COF media engineered to achieve 6,000–6,500 m²/g of surface area — a single gram has more adsorptive surface than a football field. The 90% macro-pore structure is specifically sized to capture large organic molecules like PFAS that standard carbon physically cannot trap. Covers all six major PFAS families: PFOS, PFOA, PFNA, PFBS, PFHxS, and GenX — including newer variants the EPA has not yet regulated.
Reverse Osmosis (RO)
Best for Drinking WaterRO forces water through a semi-permeable membrane with pores small enough to reject PFAS molecules. It is highly effective for point-of-use drinking water treatment and simultaneously removes heavy metals, fluoride, nitrates, and dissolved solids. The limitation of RO is that it only treats water at a single tap — it does not address shower exposure or protect appliances. Best used as the core stage in a multi-stage under-sink system.
Standard Activated Carbon
Partial Removal OnlyStandard activated carbon achieves 1,000–1,200 m²/g surface area — insufficient for reliable PFAS capture. It is effective for chlorine, taste, and odor removal, but should not be relied upon as the primary PFAS treatment stage. Catalytic carbon (used in AION CORE) performs better than standard carbon for organic removal, but MOF/COF media is the correct technology for PFAS-specific treatment.
AION PFAS Stage
AION PFAS uses Metal-Organic Framework (MOF) and Covalent Organic Framework (COF) media — the same class of materials used in advanced industrial separation and pharmaceutical applications. At 6,000–6,500 m²/g, it achieves 5× the adsorptive surface area of standard activated carbon. The 90% macro-pore structure is engineered specifically for large organic molecules like PFAS. A lab test tells you what's regulated today. AION PFAS filters what's coming tomorrow.
PFOS
PFOA
PFNA
PFBS
PFHxS
GenX
An under-sink RO system protects your drinking and cooking water. But PFAS exposure is not limited to what you drink. Research has shown that dermal absorption and inhalation during hot showers can contribute meaningfully to total daily PFAS exposure — particularly for shorter-chain PFAS compounds that are more volatile than PFOA and PFOS.
For comprehensive PFAS protection — every tap, every shower, every glass of water in your home — a whole house system with a dedicated PFAS stage is the correct solution. The AION Whole House system starts with AION CORE (catalytic carbon foundation) and adds AION PFAS as a dedicated pressure vessel, engineered for the contact time the MOF/COF chemistry requires. This is not a filter cartridge — it is a full-size pressure vessel with 2–5 years of media life before regeneration.
Why AION Designs for Tomorrow's Water, Not Just Today's
The 45% PFAS contamination figure is not a ceiling — it is a snapshot. New PFAS compounds are still being synthesized and added to EPA monitoring lists. The compounds we test for today represent only a fraction of the PFAS chemistry in circulation. AION's MOF/COF media is engineered to capture all six PFAS families, including GenX and next-generation compounds that standard carbon cannot address.
Beyond PFAS: municipal chlorine dosing increases in summer months as warmer water accelerates bacterial growth — meaning your chloramine exposure is higher in July than in January, often with no notice to residents. Arsenic levels in Southwest groundwater fluctuate with drought cycles and pumping volumes. And with 9.2 million lead service lines still delivering water to U.S. homes, pipe degradation is a trajectory, not a fixed condition.
AION systems are sized with deliberate excess capacity — not because you need it today, but because the contamination landscape five years from now will not look like today's. A system that is adequate today and inadequate in three years is not a good investment.
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