In 2020, Germany established a human-health guideline value for TFA in drinking water at 60 µg/L, which is based on a chronic rat toxicity (feeding) study, but emphasized that the concentration in drinking water should be kept as low as reasonably possible and a value of 10 µg/L should be targeted . In 2023, the Netherlands derived indicative drinking water value for TFA at 2.2 ug/L, based on the potency factor relative to perfluorooctanoic acid (PFOA) and its threshold for drinking water. Considering that the mean and maximum TFA concentrations in German drinking water sources were recently measured at 0.9 and 12.4 µg/L, 2 respectively, it is plausible that drinking water concentrations in many areas have or will exceed the 2.2 µg/L threshold in the near future.