Water borne diseases are most common in urban regions of developing countries. Urban people depend upon municipal water supply for drinking purpose. At certain time intervals, municipal supply water quality should be evaluated. Under this study, water samples were collected randomly from 20 different locations of Samastipur municipal area. Different physio-chemical test, chemical test and microbial test were tested for knowing the municipal supplied water quality. It was observed that most of the physiolochemical, chemical and microbial contamination were excess from BIS standard limit (Table 1, Table 2 & Table 3). On the basis of this study, it was confirmed that municipal supply water of samastipur area were not suitable for drinking purpose.