The massive introduction of organic matter and nutrients (nitrogen, phosphorus) in surface water disrupts the natural balance of aquatic ecosystems. These contributions are mainly due to direct discharge of effluents (domestic, industrial and agricultural), the flow of contaminated runoff after passing on of agricultural land and non-agricultural, and to a lesser extent, the impact atmospheric. The most visible manifestation of this type of pollution is the eutrophication of rivers and standing water. Data on water quality of the wadi Kebir East (East of Algeria) and the characteristics of the sources of degradation are few. In this context, the main objective of this work is to diagnose eutrophication of Oued El-Kebir, this purpose we followed physicochemical analyzes of the levels of nutrients such as nitrogen and phosphorus and other interpretive parameters in the waters of this river. The test results showed levels of nitrate ion, ammonium ion and phosphate ion are below values may cause the eutrophication at least in the sequence of the rivers during the period of analyzes