The purpose of this work is to assess the quality of groundwater in the Sidi-Taibi region; eight wells were sampled during the months of January and August 2019.19 physicochemical parameters, metallic, mineralogical and bacteriological traces. These Parameters analyzed by potentiometric, titrimetric methods and by using a geochemical diagram. The concentrations of the physicochemical parameters vary from one well to another and characterize these waters in a moderately acceptable range for certain parameters such as T ° C, conductivity, ph, bicarbonate ions, TAC and chloride for the two seasons. While for other parameters is unacceptable for human consumption, such as nitrates, sodium, sulfates which exceed the quality standards of drinking water. The main cause of this pollution is anthropogenic, which presents a major risk for humans and their environment, especially for water resources. According to the Piper diagram, these waters behove in two facies : chlorinated sulphated calcium and manganese and of the chlorinated and nitrated type, while the diagrams of Schoeller-Berkaloff and Wilcox allow us to note that these wells are presently identical profiles and of included quality between good and excellent. The Bacteriological analyzes have shown that these wells are highly contaminated. The results obtained will be of great interest to the health and hygiene services to file a preventive action in order to avoid serious health risks. Also, allow local authorities to establish awareness programs for the preservation and development of water resources.