Water is an essential commodity to mankind and the largest available source of water lies underground. Ground water occurs both in saturated and unsaturated zones. The study area falls in the Chidambaram taluk of Cuddalore district. The main aim is to study the dissolved constituents and to understand the process controlling the groundwater chemistry. About 38 groundwater samples were collected for study. The results were interpreted with piper diagram to understand the geochemical facies of the groundwater. Similarly, the data plotted in USSL diagram and gibbs’ plot for understanding the water suitability and source of the ionic concentration. pH values of the samples ranges between 7.4 to 8.2. The determined anions, cations, pH, EC, SAR, TDS and total hardness of the samples collected in the study area falls within permissible limit of WHO. According to modern Gibb’s plot, majority of samples exhibit that they were rock dominance and with minor representation in evaporation zone.
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