Abstract
Study is to evaluate the bacteriological quality of borehole water consumed by residents of the 8th district of the city of N'Djamena. Twenty (20) samples were taken and sent to the National Water Laboratory for the research of microbiological parameters. Four microbiological parameters were evaluated: Total coliforms, Escherichia coli, Fecal enterococcus and Salmonella spp. The technique used for this analysis is spreading and membrane filtration. The average values obtained in the samples are 0.338 10 4 CFU/100 ml for total coliforms, 0.319 10 3 CFU/100 ml for Escherichia coli, 33.33 CFU/100 ml for fecal Enterococcus and 1.385 10 4 CFU/100 ml Salmonella spp . The results of these analyses, considering the tolerance threshold set by the drinking water standards in Chad, showed that these averages largely exceed the recommended standards for drinking water. These waters must be treated and the environments of water points improved for consumption without impact.
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