WWEMA Corner – Just How Much is A Part Per Trillion? – by Ron Dollar, WRT SVP Sales & Marketing

As Federal MCLs are developed for PFAS, the more stringent limits seek to track the contaminant to the smallest particle which is not parts per million, or even parts per billion, but to less than 10 parts per trillion. To get an understanding of just how small one part per trillion really is, we first need to grasp the vast size of the cardinal number trillion.