This present study was conducted during the period 2010-2012. The scope of this study was the characterization of the biological of surface quality in the Inaouen catchment. Also, we focused on the identification of any existing pollutants into its waters and their origins. For this, we have, on the one hand, the study area bounded to 26 stations for surface water and directed the spatio-temporal monitoring of bacteriological for two years (November 2010 - October 2012). The analysis results revealed a spatio-temporal difference between the two sides of Inaouen watershed, following the intervention of natural and anthropogenic factors. Over time, the waters of the Oued Inaouen enrich gradually with fecal contamination tests germs. This state of pollution is greater downstream in the stations that receive more releases. This is most often related to untreated domestic and industrial waters (especially liquid olive mill wastes OMW) discharged into rivers, and agricultural runoff which is a result of fertilizer use especially in summer and autumn. Besides the germs tests of faecal contamination. This pollution effect is greater in downstream stations that receive more releases. In addition to this fact, the climatic conditions of the region are characterized by very low flows wadis in upstream during the summer season.

In the region of Taza, groundwater is a vital resource for the economy of the region. They are the crucial water resources for drinking water supply of much of the rural population and for irrigation of agricultural land. This work aims to study the physico- chemical and bacteriological quality of groundwater Watershed Oued Larbaâ during the period between April and July of the years 2011, 2012 and 2013. To do this, water samples were taken and different parameters were analyzed on the physico-chemical and bacteriological : electrical conductivity, turbidity , dissolved oxygen , pH, TAC , Na + , K + , Ca2 + , Mg2 + , Cl - , SO42 - , NO3 - , NO2 - , NH4 + , PO43 - , the oxidizability in KMnO4 - , fecal streptococci, coliforms and fecal coliforms . The results show that the water points studied are considered "unacceptable" for consumers and for irrigation; this could be explained by the presence of pollutants in the groundwater recharge.

The present work is the result of a study that was carried out over the period 2010-2012, the objective of which was to determine the state of quality and the development of the synthesis maps of the surface waters of the basin. the Oued Inaouen slope, based mainly on the study of the physicochemical and bacteriological parameters of the surface waters. The analyze were performed on 26 well-distributed sampling points at the Oued Inaouen watershed using standard methods. The results of the analyzes revealed a spatio-temporal differentiation along the Wadi Inaouen watershed, following the intervention of natural and anthropogenic factors. The right bank of the basin is characterized by significant mineralization. On the other hand, the left bank is characterized by fresh water, reflecting the effect of limestone and Liassic dolomites of the Middle Atlas on the chemical composition of the water. This state of pollution is more marked downstream, in the stations that receive more rejects. Added to this are the climatic conditions of the region, which are characterized by very low flows of wadis upstream to dry during the summer season. The origin of this pollution is related to household and industrial discharges (especially waterlogs) dumped without treatment in watercourses, and the leaching of agricultural lands, as a result of the use of fertilizers, with an enrichment of much more important in summer and autumn.

The objective of this study is to determine the physicochemical quality of the groundwater of the pre-rif of Taza region, with emphasis on fluorides. This study integrated a physicochemical characterization of these waters, covering 17 parameters including fluoride ions. The results showed that the waters studied are of very poor quality in 46.6% of the points, with an alkaline character, under oxygen in 40% of the points, and orthophosphate contents outside the recommended norms in 86.6% of the samples. A hyper-fluorinated character was also revealed in 73% of the waters studied (1.52-5.90 mg / L), with certain levels equal to 2 to 4 times the guideline value (<1.5 mg / L). Data processing by the Principal Component Analysis was carried out and the results of this analysis made it possible to highlight certain trends.