Microbial potability testing of tap water from different colleges in Central Luzon State University [manuscript]
No Thumbnail Available
Views
...
Downloads
...
Date
2017
Authors
Aprillyn P. Reyes
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Background: Tap water is the common source of water in Central Luzon State University and therefore should meet the potability requirements to be safe for drinking cooking and laboratory use. Water supply is essential for the daily living and activities of the community inside the campus, thus clean sources of water must be maintained and analysis must be done regularly in the university. Methods: Two kinds of media were used in this test, namely Nutrient Agar (NA) and EMBA. The first medium permitted the growth of all the bacteria that were present in the sample, while the second one detected the presence of E-coli. Samples were diluted using the standard serial dilution procedure. Results: After conducting serial dilution for each water sample, the number of colonies was observed after the first 12 hours of incubation in NA. Average number of colonies was computed by taking the average count. The CAG and CHSI consistently gave the highest and the lowest number of bacterial growth respectively. All the water samples collected revealed positive growth of enteric bacteria by showing a metallic green sheen, indicating presence of E. coli. Conclusion: The tap water of different colleges is not potable.