Groundwater chemical quality studies were carried many watersheds in India. In this study sixty groundwater samples were collected out in from dug and bore well during pre and post monsoon seasons. The samples were analyzed for various water quality parameters such as pH, Electric Conductivity, Total dissolved solids, Calcium, Magnesium, Sodium, Potassium Bicarbonate, Carbonate, Sulphate and Chloride. The present study have concentrated in hydrogeochemical comparative studies in Calcium and Magnesium concentration in and around of the Salem district, Tamil Nadu, using Geospatial Techniques.