The Bacteriological Quality assessment of some bottled water sold in Lagos Metropolis, Nigeria
This study investigated the bacteriological quality of some bottled water sold in Lagos metropolis, Nigeria. A total of 30 bottled water samples were used in the study. The mean pH values ranged from 5.95 to 8.30. All water samples were subjected to standard bacteriological tests such as Heterotrophic plate count and coliform count and the multiple tube tests (MPN). The mean heterotrophic plate count ranged from 1.2 x101 to 2.5 x 102 cfu/ml while mean total coliform count ranged from 0.2 x 101 to 2.0 x 102 cfu/ml. The MPN/100 ml of the samples ranged from < 3 to > 1100 coliforms/ml. Ninety-nine (99) isolates were obtained and the completed test revealed the presence of Escherichia coli (3%) and Enterobacter species (97%). All the bottled water brands did not meet up with the standard stipulated by the Nigerian Industrial Standard for drinking water quality and the World Health Organization standard. This indicates that some of the bottled packaged water available in Lagos market may be unfit for human consumption due to their inability to meet up with the recommended standard by regulatory bodies in Nigeria. Effort needs to be intensified in the monitoring of activities in this rapidly expanding industry with a view to raising standard and ensuring safety of the populace.
Keywords: Bottled water, escherichia coli, enterobacter species, MPN, public health.
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