Contaminated water is a cause of many water borne diseases, bacteria associated diseases are most commonly emerging which are responsible of increasing mortality and morbidity rate. It is necessary to monitor quality of potable water before supplying it to the consumers. The aim of study is to assess the bacteriological quality of potable water. A study was carried out on drinking water in government and semi government institutes. 1000 ml drinking water of each 8 samples are collected and analyzed for bacteriological by serial dilution and pour plate method. This study showed that 76.8% samples were positive for bacteriological parameters done by serial dilution and pour plate method. Consequently, 76.8% samples were positive for Escherichia coli. Microorganisms that were identified in samples are Escherichia coli and Klebsiella, other are Staphylococcus aureus, Bacillus, Salmonella typhi, Vibrio cholerae, Shigella, Pseudomonas aeruginosa and Streptococcus. Samples collected from drinking water sources were positive for coli forms organisms and indicator bacterial species. It needs continuous screening and treating water sources to utmost important for prevention and control of infectious diseases caused by water borne pathogen microorganisms. Therefore, regular and timely research on bacteriology is necessary to overcome crisis resulted from poor water quality.