A Systematic study has been carried out to explore the physico–chemical characteristics of ground water samples of Allahabad city. Water samples were collected from different locations of the city area by dividing into different zones. And analyzed for PH , conductivity, total hardness, total alkalinity, sulphates, chlorides , fluoride, sodium and potassium etc. the study indicates the need for periodic monitoring and GIS based study of ground water in the study area.