You're correct, yes, micrograms or ug/L. Nanograms per milliliter. Parts per trillion. For context, the old USDA/EPA threshold for health hazards was 70 ppt, n

You're correct, yes, micrograms or ug/L. Nanograms per milliliter. Parts per trillion. For context, the old USDA/EPA threshold for health hazards was 70 ppt, new June 2022 directives say "negative health effects may occur with concentrations of PFOA or PFOS in water that are near zero and below EPA’s ability to detect at this time." Too late to edit...