PFAS in drinking water was linked to a sharp rise in infant deaths

PFAS exposure is linked to a nearly 200% increase in infant mortality, Environmental Health News reported on December 19, 2025, summarizing a new study. The figure is the kind that reframes a chemical from a background concern into an immediate one.

PFAS stands for per and polyfluoroalkyl substances, a family of more than 12,000 synthetic chemicals produced since the 1940s to resist water, grease, heat, and stains. They barely break down. Scientists call them forever chemicals for that reason, and the Centers for Disease Control and Prevention detects them in the blood of nearly every American it tests.

This is a source-control story. Building biology treats the strongest fix as cutting a hazard at its origin rather than managing the harm after it spreads. An infant cannot be treated to remove PFAS, and cannot control what reaches it. The only point of control is the exposure that reaches the parent, before and after birth. Understanding how the chemicals get to a baby is the first step to closing the path.

What the study found

The study summarized by Environmental Health News linked PFAS exposure to a nearly 200% increase in infant mortality. Infant mortality refers to the death of a baby before its first birthday, a measure public health researchers treat as one of the most sensitive indicators of a population’s health.

A nearly 200% increase is close to a tripling of the baseline rate among the exposed group. That magnitude places PFAS alongside the most serious environmental risks documented for infants, and it centers the concern on the earliest and most vulnerable stage of life.

The finding fits a wider body of evidence. The National Academies of Sciences, Engineering, and Medicine reviewed the research on PFAS and linked higher blood levels to lower birth weight and to pregnancy complications including high blood pressure. Lower birth weight is itself a risk factor for infant death, which gives the mortality finding a plausible biological path.

How PFAS reach an infant

The exposure runs through four pathways, and the first begins before a baby is born.

Across the placenta. A pregnant person carrying PFAS in their blood passes a portion to the fetus. The chemicals cross the placenta, the organ that supplies the developing baby with nutrients and oxygen. Exposure therefore starts during the months when organs and systems are forming.

Through breast milk. PFAS transfer from a nursing parent’s body into breast milk. Breastfeeding carries broad, documented health benefits, and the point here is not to discourage it but to identify breast milk as one route PFAS travel, which makes reducing the parent’s own exposure the lever that matters.

Through formula water. Powdered infant formula is mixed with water, and if that tap water contains PFAS, the chemicals go directly into the bottle. Formula-fed infants consume a large volume of water relative to their body weight, so contaminated water delivers a concentrated dose.

Through household dust. PFAS shed from treated carpet, furniture, and clothing settle into house dust. Infants crawl on the floor, put their hands and objects in their mouths, and ingest more dust relative to their body size than adults. The Environmental Protection Agency identifies house dust as a common PFAS exposure route, and it weighs most heavily on the youngest children.

Why infants are the most vulnerable

Three factors converge to make infancy the highest-risk window for PFAS.

The first is timing. Early life is a period of rapid development. The brain, immune system, kidneys, and metabolic pathways are all still forming, and an exposure a mature body might tolerate can interfere with systems under construction.

The second is dose relative to size. Infants eat, drink, and breathe more per pound of body weight than adults. A given concentration of PFAS in water, milk, or dust delivers a larger dose to a small body.

The third is clearance. PFAS leave the body slowly, measured by a value called the half-life, the time it takes for half the amount present to clear. Common PFAS have half-lives measured in years. A load that arrives before birth does not clear before the most vulnerable months are over.

The scale of exposure

PFAS are not a niche contaminant. The Centers for Disease Control and Prevention measures them in blood serum through its National Report on Human Exposure to Environmental Chemicals and detects PFOA, PFOS, and other PFAS in the vast majority of the US population it tests.

The health record supporting concern is documented. The National Academies links higher PFAS blood levels to raised cholesterol, reduced antibody response to vaccines in children, changes in liver enzymes, pregnancy complications, lower birth weight, and kidney and testicular cancer. The Environmental Protection Agency has concluded there is no level of PFOA or PFOS in drinking water below which no health risks occur.

That conclusion drove regulation. In April 2024 the EPA set the first enforceable national drinking water limits for PFAS, capping PFOA and PFOS at 4 parts per trillion each and setting limits for four additional compounds. Four parts per trillion is roughly four drops of water in an Olympic-sized swimming pool, a threshold that reflects how little exposure the agency considers acceptable.

The one pathway a parent controls most directly

The bill for that contamination has already started landing on manufacturers: 3M agreed to pay up to $12.5 billion to water utilities. Of the four routes, drinking water is the one a household can measure and treat with the greatest certainty. Water carries PFAS into a parent’s body, into breast milk, and directly into formula.

Public water customers can find PFAS results in their utility’s annual Consumer Confidence Report as monitoring under the 2024 rule expands. Private wells are not covered by the federal rule and are not tested by any utility, so a well near a manufacturing site, a military base, an airport, or a landfill warrants a certified laboratory test. Testing is the only way to know a level, because PFAS have no color, smell, or taste.

Practical fixes: cut the source before it reaches the baby

You cannot filter PFAS out of an infant’s body. The reliable approach reduces what reaches the parent, and therefore the baby, at the pathways that matter most. These steps target the largest sources.

Filter drinking and formula water. Reverse osmosis systems and certified activated carbon filters reduce PFAS. Look for certification to NSF/ANSI Standard 53 for carbon or Standard 58 for reverse osmosis, both specific to PFAS. Use filtered water for drinking, cooking, and mixing formula, and replace cartridges on schedule, because a spent filter stops working.

Test your water first. Check your utility’s Consumer Confidence Report, and test a private well through a certified laboratory, especially if you live near a known PFAS source. Match the filter to the result.

Replace nonstick cookware. Switch to cast iron, stainless steel, or carbon steel, none of which use PFAS coatings. Discard any nonstick pan once the coating scratches.

Skip grease-resistant packaging. Avoid microwave popcorn bags and move fast food and takeout out of coated wrappers as soon as you can, since PFAS migrate from packaging into food.

Control house dust. Vacuum with a sealed HEPA filter and damp-dust hard surfaces to remove the dust that carries PFAS. Keep infants’ hands and toys clean, since hand-to-mouth contact is their main dust exposure route.

Choose PFAS-free textiles. Look for furniture, carpet, and clothing labeled free of PFAS or perfluorinated chemicals, and skip optional stain treatment on new upholstery and carpet.

Do not rely on boiling. Boiling does not remove PFAS, and because the chemicals stay behind as water evaporates, boiling can slightly concentrate them.

The bottom line

A new study links PFAS exposure to a nearly 200% increase in infant mortality, Environmental Health News reported on December 19, 2025. The chemicals reach a baby through four routes: across the placenta before birth, through breast milk, through formula mixed with contaminated tap water, and through house dust. Infants are the most vulnerable group because they are exposed during rapid development, take in more relative to their size, and clear the chemicals slowly. The Centers for Disease Control and Prevention finds PFAS in nearly every American, and the EPA capped PFOA and PFOS in drinking water at 4 parts per trillion in 2024 because it found no safe level. You cannot filter these chemicals out of a baby’s body. You can cut the source that reaches the parent. Test and filter your water, replace nonstick cookware, skip grease-resistant packaging, and control house dust. Each source you close lowers what reaches the child.