The world health organisation has estimated that up to 80% of all sickness and disease in the world is caused by inadequate sanitation, polluted water or unavailability of water. So the study was conducted to isolate and identify the micro-organism responsible for the contamination of drinking water Material and methods; a total of 30 drinking water samples were collected. Presumptive test by multiple tube method and confirmative test by identification of bacterial isolates was carried out. Out of 30 samples collected 10(33.33%) were contaminated with either one or more than one type of organisms, results of most probable no test(MPN) showed 4(13.33%) were unsatisfactory. Pseudomonas was the common cause of contamination about 6(20%) while Escherichia coli and Klebsiella pneumoniae were 3(10%), Proteus vulgaris 1(3.33%). Conclusions; Pseudomonas was the major source of contamination. A regular monitoring of the water quality for improvement not only prevents disease and hazards but also checks the water resources from going further polluted.