In this study, the effect of initial nitrate loading on nitrate removal and byproduct selectivity was evaluated in a continuous system. Nitrate removal decreased from 100% to 25% with the increase in nitrate loading from 10 to 300 mg/L NO3-N. Ammonium selectivity decreased and nitrite selectivity increased, while nitrogen selectivity showed a peak shape in the same range of nitrate loading. The nitrate removal was enhanced at low catalyst to nitrate ratios and 100% nitrate removal was achieved at catalyst to nitrate ratio of ≥ 33 mg catalyst / mg NO3-N. Maximum nitrogen selectivity (47%) was observed at 66 mg catalyst / mg NO3-N, showing that continuous Cu-Pd-NZVI system has a maximum removal capacity of 37 mg NO3 - -N/gcatalyst /h. The results from this study emphasize that nitrate reduction in a bimetallic catalytic system could be sensitive to changes in optimized regimes.