The study was carried out to assess the quality of ground water using WQI approach in and around Dindigul town, Tamilnadu, India. Twenty three groundwater samples were taken from the bore wells with necessary precautions. All the groundwater samples were subjected to analysis of physico-chemical parameters. Each parameter is compared with the standard limit prescribed by the WHO. The results obtained from the analysis have been used to predict water quality using WQI. 12 parameters such as as pH, TDS, HCO3, Cl, TH, Ca, Mg, NO3, SO4, F, Fe and Mn have been selected for calculating WQI. The WQI values are recorded from 39.5245 to 65.7243 for 23 groundwater samples. 30.5 percent of the samples are coming under excellent category and can be used for human consumption. The remaining sampling stations need treatment before use. The WQI is also ideally suited to computerizations and reduce the amount of time involved in classifying water quality.
Key words: Groundwater, Water quality index, Dindigul, Tamilnadu.