The water table of the alluvial plain of Telezza - Collo (province of Skikda) is part of the sub-catchment area of Oued Guebli and Oued Cherka, it shows an elongated quadrilateral shape with a length of 10 km and a width of 5 km along the Mediterranean Sea, with an area of about 20 km2. This water table circulates in the clayey-marl formations of the Miocene and the plio-quaternary grounds of alluvial nature. This region is part of the coastal areas of North East Algeria, with agricultural vocation, hence the need for irrigation in the face of the hazards of climate change, especially in the summer season. The present approach aims to provide an overview of the problem of salinization of groundwater in the Telezza plain. The results obtained on the physico-chemical parameters of 28 wells, show that the groundwater is affected by a strong salinization due mainly to the intrusion of marine waters. These waters are classified as acceptable to non-acceptable with values between 600 mg/l and 1800 mg/l. This salinization shows a spatial evolution well correlated with the distance from the sea, with a gradient of about 500 to 600 mg/l accentuated especially in the areas of the Cherka and Guebli ravines. The potential causes of this strong marine intrusion are diverse and complex, so the mode of salinization depends on the geographical context (coastal), geological (the high porosity of alluvial formations and mineralization of sediment) and climatic (drought), but also various anthropogenic sources (overexploitation of groundwater by pumping near the shore, unreasonable exploitation of beach sands, urbanization and the realization of dams in the region) may influence and accentuate the effect of marine intrusion.