The present study was intended to assess the ground water quality for drinking purpose and to determine principal pollutants of ground water through Nemerow’s Pollution Index (NPI) in Bassi Tehsil of district Jaipur, Rajasthan, India. For this ground water samples from 71 sampling sites of 50 villages of study area were collected from tube wells and hand pumps of varying depths in pre and post monsoon seasons and analyzed for ten physico-chemical parameters namely pH, total alkalinity, total hardness, calcium, magnesium, chloride, nitrate, fluoride, total dissolved solid and electrical conductivity. Analysis of results showed that almost all parameters were exceeding the permissible limits prescribed by BIS, ICMR and WHO. According to NPI values the observed principal pollutants (pollution causing parameters) in the present study are total alkalinity, chloride, fluoride, nitrate, total dissolved solids and electrical conductivity in both pre and post monsoon seasons.

Keywords: Groundwater Quality; Physico-Chemical Parameters; Nemerow’s Pollution Index (NPI); Bassi Tehsil and Rajasthan;