In summary, we have provided the first detailed atomistic study of PFAS degradation dynamics using a correct treatment of hydrated electrons, which we probe with a suite of advanced ab initio molecular dynamics and sampling techniques. Our calculations show that PFAS degradation with hydrated electrons is markedly different than that of excess electrons/charges, a common (but crude) approximation used in all previous studies up to this point. More specifically, we find that C-F bond dissociation with excess electrons