This research work is carried out to study ground water quality of the Hirehalla watershed of Koppal district,
Karnataka, India. The ground water quality has been analyzed in the laboratory as per standard methods recommended by
the Bureau of Indian Standard (BIS) for drinking water. The samples were collected from 43 villages across the watershed
in such a way that they represent the entire watershed. The toposheets of the Hirehalla watershed have been used for
digitization work using ArcGIS-10.1 software. The Water Quality Indexing (WQI) is done for the study area using
important water quality parameters. Ground water quality parameters have been integrated to generate thematic maps
showing spatial distribution of various water quality parameters using Inverse Distance Weighed (IWD) spatial
interpolation technique with Arc GIS10.1 software. The WQI depicts about 25 villages (58.13%) are having good samples,
1 village (2.32%) is having very good sample and 17 villages (39.53%) are having samples unfit for potability out of 43
village.
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