Identifying the source of recharge and discharge of the aquifer is one of the most important issues that are considered in water resources management, environmental decision-making and planning, natural resources, and agriculture. The Evan Plain is located in Khuzestan province, in the southwest of Andimshek city. In this plain, we see an increase in the level of ground water and a decrease in the depth of ground water compared to the surface of the earth. For this purpose, in order to prevent problems in the future, it is necessary to carefully examine the recharge sources in this plain. In this regard, in order to evaluate the recharge resources of the Evan Plain, we conducted isotopic and hydrochemical sampling in the wet (April 1402) and dry (July 1401) periods. The results of hydrogeological investigations of the region as well as hydrochemical analysis and statistical analysis of hierarchical clustering (HCA) all indicate that the groundwater samples of Evan Plain fall into two groups. The first group is influenced by atmospheric precipitations, and the second group indicates the hydraulic connection with the Abbas plain. Also, the agricultural return water from the irrigation and drainage networks is effective in recharging this group.