RESUMEN
Ground water is one of the main source of drinking water in Nanded city. City has witnessed a tremendous increase in population. This has lead to establishment of new colonies. A large section of residents live in the newly established crowded colonies under unhygienic conditions. The public bore wells, located in these areas are the main source of drinking water The present study was carried out to monitor the suitability of raw ground water for safe drinking purposes and to investigate the status of these sites for bacterial contamination throughout the year The results of this study revealed significant increase in the concentration of indicator organisms in all the samples during monsoon season. As a result the potability of ground water has become a severe concern in such localities of Nanded.