Infants fed formula prepared with tap water may receive concentrated PFAS exposure during a critical developmental window. Formula preparation involves mixing concentrated powder or liquid with water, and any PFAS present in that water directly contributes to infant intake at rates higher per body weight than adults experience.
Why Infants Are at Particular Risk
Infants consume formula as their primary nutrition source, ingesting large volumes of water relative to their body weight. Their blood-brain barrier is not fully developed, organ systems are in critical developmental phases, and their kidneys are less efficient at excreting PFAS. The combination of high exposure relative to body weight and developmental vulnerability makes PFAS-contaminated formula water a significant health concern.
Identifying Your Risk
Check your utility’s most recent water quality report or monitoring data for PFAS results. Well water should be tested by a certified laboratory before use in infant formula. Even concentrations below the EPA MCL may warrant caution given infant vulnerability — many pediatric health organizations recommend using filtered water regardless of source concentrations when infants are in the household.
Filtration Recommendations
For formula preparation, reverse osmosis or a certified carbon block filter with documented PFAS certification provides the most appropriate protection. Some pediatric health authorities recommend using certified filtered water or PFAS-tested bottled water for formula preparation as a precautionary measure regardless of local water status. The incremental cost of filtered water for the relatively small volume used in formula preparation is modest compared to the exposure reduction achieved.