Abstract
The main objective of the study was to determine the groundwater geochemistry and controlling factors in the Cheyyar watershed in the Thiruvannamalai district of Tamil Nadu. During the month of February 2017, 46 groundwater samples were taken. Piper's chart indicates that most waters classified as alkaline earth are over alkaline, and strong acids exceed weak acids. The Durov diagram indicates that the groundwater in the study area is of mixed type for cation and anion; the cation is mostly Cl and HCO3. The molar diagram reveals that silicate rock types are the most common in the study area, and these rocks are important to the chemistry of groundwater. Factor analysis identified the interaction between rock and water as one of the major reasons for the findings. Most of the major ions are correlated with TDS, EC, Ca, and Mg. From the DWQI, about 75% of samples are useful for drinking purposes.
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