The Morrosquillo coastal aquifer is the main water supply source for the coastal area of the department of Sucre, Colombia. Antioquia University and the Corporacion Autonoma Regional de Sucre –CARSUCRE-, water resource manager in this region, carried out a chemical assessment of the groundwater of this reservoir with the objective of validating the flow conditions and defining the model of hydrogeochemical evolution, which was validated using NETPATH inverse modeling software.