In order to evaluate the behavior of the ECs in the DWTP, first their occurrence in the raw water (Llobregat River) was determined. Secondly, EC removal behavior was evaluated for all the units available in the DWTP. Finally, ECs concentrations present in the influent of the DWTP and in the product of the EDR process wereevaluated and compared in order to determine the cumulative EC removal of the whole DWTP processes