Water is an essential resource. Its use for food, body hygiene or recreational requires a high level of physico-chemical, chemical and microbiological quality. The substances they transport are in fact likely to be ingested, inhaled, or to come into contact with the skin. Therefore, the analysis of eight parameters in addition to pH and which are the electrical conductivity, total phosphorus, chloride, Ammonium, Sulfate, Nitrate, Chemical Oxygen Demand (COD) and Matter in suspension (MES) as well as the analysis of total coliforms, faecal streptococci and clostridium were carried out on the waters of three lakes, Dayat Morsli, Telamine, and Gharabas, located in Northwestern Algeria in the Oran region. The results show that the three lakes are saline wetlands where total phosphorus is found at lower concentrations while chlorides, Ammonium and Sulfate are found at concentrations above standards. The pH of Lake Dayat Morsli, the Nitrate of Lake Telamine, the COD and the MES of Lakes Dayat Morsli and Telamine exceed international standards. These results could be used as a basis for the rehabilitation project of this wetland.