In Thiruvarur Taluk, Thiruvarur District, Tamil Nadu, India, this study assessed groundwater quality for drinking and irrigation. The geological and hydrogeological aspects of water samples were measured. Geographically, the study region located between North latitude is 10°48'54" N and 10°43'20", with East longitude between 79°40'45" and 77°33'24", respectively. The taluk's total area is 315.08 km². Overall, 40 groundwater samples were taken from bore wells, and various physicochemical parameters and major ion chemistry like pH, EC, TDS, Ca2+, Mg2+, Na+, K+, HCO3-, Cl-, SO42-, andNO3-were analysed. According to the groundwater quality, Piper, United States Salinity Laboratory and Wilcox’s diagrams were plotted; and groundwater quality has been illustrated for domestic and agricultural purposes. The piper plot shows the scattering of the examples in different areas without clustering. So, the area comprises groundwater differing in quality in different areas. An Overview of the chemical relationships of groundwater with the help of a tri-linear diagram reveals that 82.5 % (of the samples are Alkalies exceed alkaline earth and Strong acids that exceed Weak acids.A sodium absorption ratio of 77.5%and a sodium percentage of 45% recommend that most of the sample falls under the acceptable border of irrigation and drinking utility.Doneen's diagrams show that 10 % of the samples are 100% percolation to the ground, and 65 % of the samples are 75% percolation to the ground.Using geospatial analysis, the water-quality index was calculated. In this study, the WQI ranges from 11.98 to 228.04, with 66.92 being the mean value. Based on the results, 80 % of samples fall into excellent to good classes, while 15 % and 2.5 % fall into poor to very poor categories, respectively. Based on the studies, groundwater quality is safe for drinking purposes, but in a limited sample, which exceeds the limit, due to anthropogenic activities.
