The present work is aimed at assessing the water quality index (WQI) for the groundwater of Tumkur taluk. This has been determined by collecting groundwater samples and subjecting the samples to a comprehensive physicochemical analysis.

Tumkur Taluk is located in the southeastern corner of Karnataka state between 13o 06'30" to 13o 31' 00" North latitude and 76o 59' 00" to 77o 19' 00" East Longitude. The Taluk spreads over an area of 1043 falling within the semiarid region and frequently facing water scarcity as well as quality problems.