EPA Testing Methods May Miss Half of PFAS Contamination in US Drinking Water

New analysis suggests that common testing methods for PFAS, or 'forever chemicals,' in US drinking water could be underestimating contamination levels by as much as 50 percent. The issue lies in how laboratories handle samples: when concentrations fall below certain thresholds, results are often rounded down to zero, effectively hiding low-level but potentially significant exposures. Given that the EPA recently proposed strict limits on PFAS in public water systems, accurate detection is critical for compliance and public health. Communities relying on routine monitoring may be unaware of actual contamination, delaying necessary interventions. As researchers push for more sensitive testing protocols, the gap between reported and real-world PFAS levels could force a reassessment of water safety nationwide.