New research suggests PFAS in US drinking water and waterways is underestimated

· Climate · United States

A study published in Cell Reports Sustainability reanalyzed federal monitoring data and found that estimated PFAS concentrations in U.S. drinking water could be higher than reported, because readings below laboratory reporting limits are sometimes treated as zero in statistical analyses. Separately, a new report found that roughly 96% of 23 Florida waterways tested between 2022 and 2024 contained the toxic "forever chemicals" linked to cancer and other health problems, reflecting widespread contamination of streams, rivers and lakes. Together the findings suggest regulators and utilities may be working from an incomplete picture of exposure, with implications for treatment investment and drinking-water standards.

Why it matters：If monitoring gaps hide real exposure levels, utilities and regulators could underinvest in treatment and set standards on faulty baselines — a problem that applies far beyond the US.

Key points

  • Readings below lab reporting limits were sometimes counted as zero in analyses
  • About 96% of 23 Florida waterways tested from 2022 to 2024 showed PFAS contamination
  • PFAS are linked to cancer and other health problems

Sources (original reporting)

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