Myanmar Health Sciences Research Journal
Volume 27, Number 2
TITLE: Detection of Bacteriological Contamination of Bottled Drinking Water in Yangon City
AUTHOR: Thin Su Kyaw, Myint Han, Khin Chit, Zin Zin Nwe, Naing Win, Aye Aye Khin, Wah Win Htike & Kyu Kyu Win
SOURCE: Myanmar Health Sciences Research Journal. 2015; 27(2): 118-124
ABSTRACT: Laboratory-based, descriptive study on detection of bacteriological contami-nation of bottled drinking water in Yangon was done from April 2012 to March 2013. A total of 50 commercial brands of 92 bottled drinking water samples, randomly purchased from retail outlets, grocery shops, super- markets, street vendors and distribution centers in Yangon were analyzed for bacteriological parameters such as standard plate count by pour plate method and total coliform and Escherichia coli by Multiple-tubes method. The types of samples were 20 Liter Polyethylene (PE) and Polyethylene terephthalate bottles (PET), 1 Liter Polyethylene and Polyethylene tere-phthalate bottles. In this study, 41.3% of local drinking water products (22 out of 50 brands) from Yangon City did not comply with Australian New Zealand standard code for standard plate count and WHO drinking water guidelines (2011) for coliform and Escherichia coli. Thirty-two samples (34.7%) failed in standard plate count that was more than 100 colony forming unit (CFU) per ml and 30 samples (32.6%) failed in total coliform count that crossed the standard of 0 Most Probable Number (MPN) per 100 ml of water. Most of the unsatisfied samples were found in the 20 Liter bottles with tap which were highly demanded in Yangon market. This study highlighted that some bottled drinking water products sold in Yangon City were contaminated with bacteria and not fit for human consumption as the result of poor processing before and after bottling such as treatment system, washing and disinfection of reused bottles, filling and sealing, storage, handling and distribution.