150 km long, the ancestral canal of Oued Righ evacuates water leachates into the Chott Melghir that includes 50 oases. Since the eighties, the excess water caused by discharges of urban sewage and drainage water, combined with overexploitation and use of deep water tables (Terminal Complex and Continental intercalary) caused a huge problem, which is the upwelling of groundwater, which led to an imbalance in the valley (deterioration of the urban fabric, palm flooding, increase of the salinity excess in agricultural soils). Several sections of the canal are thereby polluted, in fact the water quality of the collecting canal of the valley are of poor quality and their salt content can exceed 7 g/l of dry residue, combined with the presence of a water table near the soil surface, is one of main cause of soil sterilization of several agricultural areas, including the adjacent palm groves. To observe the alarming state of some palm groves, we paid visits during the years 2009 and 2010 in the oasis of Oued Righ Valley. The physico-chemical and water pollution analysis of 9 stations that cross the collecting canal, and 5 piezometric water table points surrounding palm groves, have shown that the quality of these waters is degraded enough, of very high salinity (class C5), with electrical conductivity up to 26.30 ms/cm, an SAR> 28 (S4 class), a value of TDS of up to 21 g/l in the channel. Thus, canal water is mostly of very poor quality, charged with mineral salts, it is a brackish water of the sodium chloride facies, pollution is most felt in the channel upstream of station Kardeche, and decreases in the downstream at Touggourt.