The present study was carried out in order to assess the quality of groundwater in the western region of Oum El Bouaghi district, (commune of Souk Naamane and commune of Ain M'lila). A total of 9 wells and 2 water springs were tested in the two communes over a period of eight months from October 2017 to May 2018. The fauna were sampled using two methods: the net phreatobiological and the baited trap method. Some physicochemical properties of the wells were measured during each campaign. 1237 individuals belonging to 47 families were recorded during the sampling. From a physical-chemical point of view, the analysis in main components indicates that the water is highly mineralized.