This works presents the assessment of groundwater resources of the Azángaro Formation dominantly composed of lacustrine deposits, located in the Peruvian territory, Department of Puno. The area of interest is part of the Titicaca Lake Basin, which is about 3840 m a.s.l., and covers 180 km2 .The local morphology of the area is characterized by a soft waved plain surface contrasting with a set of elongated hills or isolated slopes. This geomorphological pattern was developed over volcanic and sedimentary formations from Cretaceous to Tertiary. These rock sequences exhibit great structural complexity and are related to the tectonic evolution of the Peruvian Andean Cordillera. The unconsolidated deposits of the Azángaro Formation, which represem the aquifer system, were hidrogeologically investigated using lithological data from 25 wells and 37 vertical electrical soundings besides hydrodynamic tests. The physical space of the reservoir comprises three distinct facies units recognized within the local stratigraphic column and geological profiles. The middle layer unit, makes the bulk of the aquifer of interest mainly due to its morphology as defined by the vertical electrical soundings. The thickness of the aquifer is variable from 30 to 60 m, composed of sands and graveis. The specific yields are of the order of 10 to 20 m3/h.m
