The Bongor region, located between 10°12' and 10°20' North latitude and 15°22' and 15°34' East longitude, is part of the quaternary aquifers of Chad. It has potential in water resources but knowledge of its hydrodynamic and hydrogeochemical functioning remains insufficient. Thus, this study aims to gain knowledge of the hydrogeochemistry of groundwater in the Bongor area and its surroundings. The hydrogeochemical methods adopted are based on the Piper diagram, Gibbs diagram, descriptive statistical analysis and Principal Component Analysis that can characterize these waters and understand their evolution. The piezometric map shows a direction of groundwater flow from southeast to northwest. A total of 25 samples of water points (well water, borehole water and surface water) were subjected to physicochemical analyses. The results of these analyses showed that all the waters measured have an acid pH tending towards neutrality and an average temperature of 31.6°C. The waters are generally not very mineralized, with an average conductivity of 173.71 µS/cm. The hydrogeochemical study shows an evolution from calcic and potassic bicarbonate facies to calcic and magnesian bicarbonate facies. It indicates that the groundwater is of evaporitic origin and hydrolysis of minerals from precipitation.
