The aim of this study is to explore the correlations between actual water losses and the materials used, as well as the diameters of pipes, in the water distribution systems across five municipalities in the Lake Region of Rio de Janeiro State, Brazil. We analyzed 273 episodes of pipe bursting between June and July 2019, identifying the types of materials and pipe diameters where the leaks occurred and comparing them to the total length of each type of material and diameter. PVC pipes of 50 mm and DeFoFo pipes of 100 mm exhibited the highest percentages of ruptures exceeding anticipated levels (18.94% and 2.68%, respectively). The methodology employed in this study can be applied to analyze other water distribution networks.