Groundwater quality is important as it is the main factor determining its suitability for drinking, domestic, agricultural and industrial purposes. The suitability of groundwater for drinking and irrigation has been assessed in north and eastern part of Krishnagiri district, Southwestern part of Vellore district and contiguous with Andhra Pradesh states, India. A total of 31 groundwater samples were collected in the study area. The groundwater quality assessment has been carried out by evaluating the physicochemical parameters such as pH, EC, TDS, HCO À 3 , Cl-, SO 2À 4 , Ca 2? , Mg 2? , Na ? and K ?. The dominant cations are in the order of Na ? [ K ? [ Ca 2? [ Mg 2? while the dominant anions have the trends of Cl-[ HCO À 3 [ SO 2À 4 [ CO 3. The quality of the water is evaluated using Wilcox diagram and the results reveals that most of the samples are found to be suitable for irrigation. Based on these parameters, groundwater has been assessed in favor of its suitability for drinking and irrigation purpose.
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