Safe drinking water is the primary need of every human being. Ground water is believed to be clean and free from pollutants as compared to the surface water. So it is being used invariably as amajor source for drinking, domestic and irrigation purposes in both urban and rural are as (Gupta et al., 2009). In the present investigation the ground water quality of the urban and rural areas of Ajmer district of Rajasthan state of India has been extensively studied & comparative study is also carried out assess the ground water quality is to the rural and urban blocks with in the districts. Ground water samples were collected from 28 different locations of urban area and 21 samples from rural areas of the district and analyzed for physicochemical characteristics such as pH, Total Dissolved Solids, Calcium, Magnesium, Total Hardness, Electrical Conductivity, Chlorides, fluoride, Nitrate, Sulphate, Sodium,Potassium, Total Alkalinity, etc. The results of analysis obtained were compared with the water quality standards specified by World Health Organization and Bureau of Indian standard (BIS). Statistical interpretation of the data through correlation studies showed that ground water of some of the areas arenot suitable for drinking purposes as they exceed the permissible limits. Thus it can be concluded that some of the water sources in present study area need a proper primary and secondary treatment prior to consumption and preventive steps should also be taken to prevent these sources from contamination.