Abstract: This study was carried out through a period at four months from October/2008 to Jaunary/2009.The goal of this work was to determine the efficacy of filters water that have low level of pathogenic bacteria. 4o samples of water were collected (randomly) from 40 different filters devices.The results showed that some types of filters are not safe in elimination of bacteria from water.That represented by: Escherichia coli, Pseudomonas aeruginosa, Staphylococcus epidermidis, Streptococcus faecalis, Staphylococcus aureus, and Vibrio cholerae with percentages 5(26.3%), 5(26.3%), 5(26.3%), 2(10.5%),1(5.3%),1(5.3%) respectively. Also the results showed that the efficacy of filters depends on the types of filters, times of use and the clean of devices.