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ABSTRACTABS The present paper deals with Physico-chemical analysis of ground water quality of five different villages of Sherghati block at Gaya district, Bihar, i.e. Bela (S1), Chanpi (S2), Cherki (S3), Chitabkala (S4) and Shrirampur (S5). The groundwater parameters such as, pH, Temrature, Alkalinity, Phosphate,Calcium, Magnesium, Sodium,Potassium,Turbidity, Total Hardness, Dissolved Oxygen, Biochemical Oxygen Demand, Chemical Oxygen Demand,TDS, Arsenic, Iron, Nitrate,Chloride and Fluoride were estimated in the samples to evaluate their quality. The data of physico -Chemical parameters are compared with WHO (1992) and IS: 10500 standards for drinking water. Our result revealed that concentration of DO, BOD, Total Hardness, Nitrate, Calcium, Magnesium, Turbidity, Iron,Alkalinity,and Chloride are within permissible limits. Whereas Arsenic and Phosphate are negligible in comparison to permissible limits. The Ground water can be used as drinking and irrigation purposes. Finally it can be suggested that an intensive study may be carried out on other living organisms to avoid the hazardous/ injurious impact of the other chemical substances if these are present in the ground water.