Diverse studies have shown that mixing within pipe junctions is neither complete nor instantaneous. However, these studies have focused in understanding mixing phenomena at junctions, without applying these results in water quality modeling of water distribution networks. This paper focuses on the application of both the complete and incomplete mixing models to model water quality in water distribution networks. Hydraulic networks are modelled in EPANET and EPANET-BAM, and the concentrations and their distributions are compared. Results show that there is little difference between the two mixing models, so water quality modeling might be done by using EPANET and its complete mixing model.