The provision of safe supply of drinking water is a high priority issue to a government for safe guarding the health of human beings. The production and supply of adequate and safe drinking water is the most important factor contributing to a decrease in morbidity and mortality in developing country like India. As we know water is a very good solvent, hence some toxic and hazardous substance dissolves in it and produce water pollution problem posing many parameters of interest for water quality assessment. In Rajasthan 71% of the irrigation and 90% of the drinking water supply sources are under ground water (Rathore 2005).Water quality index is one of the most effective tools to communicate information on the quality of water to the concerned citizen and policy makers. It thus, becomes an important parameter for the assessment and management of ground water. In absence of surface water resources, people of the area primarily depend upon underground water to meet out their drinking and agricultural requirements. The underground water in the study area is characterized by medium to high salinity. More than 57% water is of sodium chloride type and distributed throughout the district. The district is notorious for having high fluoride and nitrate concentration in underground water [1], which makes it unsuitable for drinking purpose. The dry climate condition with high evaporation and insignificant recharge might have accelerated the strengthening of fluoride and nitrate concentration in the underground water of this area.