Evaluation of Microbial (Escherichia coli and Salmonella enteritidis) Quality of Bottled water in Tehran during 2015-2016

The aim of this study is to evaluate the microbiological quality of bottled water in the city of Tehran. This is a descriptive study that the process of doing was selectively brands of mineral water in the city of Tehran. E. coli as the indicator of pollution of water and food. The reason for this is that the bacteria can be found in the feces in large numbers and their presence in drinking water and food is a risk to consumer's health.

In this study to evaluate the infection or the lack of infection of bottled water in Tehran, between 10 valid and high consumption brands, 10 brands selected based on the proposed methods in national standards of Iran. 10 samples selected at random with different production dates (100 samples). At first the Samples was tested with MacConkey broth multiple tube fermentation technique (mpn 9 tubes). Then was tested in lactose broth and mpn method (9 tubes). Finally, was tested to the presence or absence of Salmonella enteritidis with traditional method (three-stage).

Observations and the results of this study showed none of the samples proved to carry microbial problems as E. coli and Salmonella enteritidis and were on the standars ranges.

According to the results, bacterial quality in all tested samples in Tehran, is in accordance with national standards and World Health Organization and not threatening consumer's health and is healthful enough to be used for drinking.