A comparative study of the influence of an addition of Zn to Cu as the basic cathode material on electrocatalytic activity for NO3- reduction was performed. Potentiodynamic measurements using a rotating ring-disk electrode were carried out in an artificial solution simulating solution after regeneration of the ion-exchange column for NO3- removal in drinking water treatment. The results were verified by batch electrolysis experiments. An enhancement of the electrocatalytic activity was observed. Unfortunately, NH3 was found to be the main NO3-reduction product. The highest electrocatalytic activity was obtained using an electrode containing 41 wt.% Zn.