In the North Eastern part of Algeria, The plain of Annaba El-Tarf, constitutes a privileged sector in agricultural activity, characterized by piezometric levels very close to those of a soil generally fertile, several modes of irrigation are practiced in which the gravitational one is the most used, This use causes significant loss of water pumped and groundwater pollution by irrigation return waters concentrated by evaporation and leaching. The aim of this study is to focus on the impact of irrigation return waters on the quality of groundwater in the irrigated perimeter of Bounamoussa and for this purpose, sampling campaign and hydro chemical analysis was carried out through wells and boreholes of the study area, The physicochemical analysis by different methods (Piper diagram, PCA, AHC, Richard diagram) showed the presence, first, high mineralization producing a high salinity due to high concentrations of major elements (Calcium, magnesium, chloride) which are due to the leaching of geological formations, second pollution by nitrogen elements (nitrates, nitrites, ammonium) and phosphates which are due to the intensive use of agricultural fertilizers and domestic discharges.













