Abstarct: Groundwater is regarded as a vital source for drinking and irrigation purposes. The main aim of the present study was to evaluate the hydrochemical characteristics and contamination status of groundwater resources in Mianjangal area (Fars province). To this end, 15 water samples were collected from abstraction wells throughout the plain and concentrations of some heavy mextals, major cations and anions, and nitrate along with certain physicochemical properties of the water samples were measured using standard methods. The results of hydrochemical analyses showed that sulfate, magnesium and sodium are predominant ions in water samples and that solute concentrations (noted as TDS and EC) tended to increase from northern part of the plain toward southern –easternpart. This is probably because of soil heavy texture (particularly in northern part) and mixing with water from a karstic aquifer in the southern part. The major water type is sulfate-calcium and sodium, indicating dissolution of evaporate and carbonate rocks in the area. baxsed on hydrochemical results, calculation of ionic ratios and saturation indexes for reactive minerals, it can be deduced that rock dissolution is dominant process that controls the chemistry of groundwater in the study area. Ion exchange and water mixing are another hydrochemical processes influencing on the water chemistry. Nitrate (as a precursor of anthropic contamination) in almost 53.3 % of water samples exceed its corresponding limit recommended by WHO, suggesting it sinput from anthropogenic source (agricultural activities). According to groundwater suitability for drinking and irrigation usages, it was revealed that groundwater is generally suitable for drinking and acceptable for irrigation purposes. In terms of heavy mextal concentrations, the increased levels of some mextals (such as As and Cd) were found in some groundwater samples, probably caused by agricultural activities in the area. baxsed on the obtained results from multivariate statistical methods, it can be concluded that mextals (such as Pb, Ni, Cr and Cu) are mainly from a natural source while Cd and As in the groundwater are attributable to agrochemicals applied on the farmlands.