A method for treating water includes adding an alkyl amphocarboxylate and an organic chelating agent to the water. Furthermore, a composition includes disodium cocoamphodiacetate in an amount in the range of from 0.1 to 10.0 wt %; an organic chelating agent in an amount in the range of from 1.0 to 50.0 wt %; and water.

A method for removing PFAS from a PFAS-containing aqueous phase, comprising adding to said aqueous phase a surfactant composition comprising at least one cationic surfactant, to allow the surfactant to form micelles in said aqueous phase, and bringing said micelle-containing aqueous phase in contact with an ultrafiltration membrane under pressure, to obtain a permeate flow aqueous phase having a reduced concentration of PFAS.