PRELIMINARY OBSERVATION OF MICROBIAL CONTAMINATION IN DRINKING WATER IN SEVERAL DISTRICSTS OF HANOI CITY

Abstract

Poor water quality and enviromental sanitation are the main causes of human desease and
mortality, especially for children. According to the World Health Organization (WHO), in countries where
most population have not been utilized the safe water supply or the polluted water with microbial
pollution, people have risked with many kind of diseases including intestinal diseases. Therefore, the
assessment of the water quality, especially on microbial contamination level in drinking water is very
necessary. This paper presents the observation results on coliform density in drinking water in different
districts in Hanoi city during the period from 2015 to 2017. The results show that most of drinking water
samples from tap water in Hanoi are not contaminated by Coliforms. However, microbial contamination
was found for well water (at Gia Lam, Tu Liem and Thuong Tin ) with high total Coliforms and E.coli
densities exceeded the permissible limit of the QCVN 02:2009/BYT, column I. The results revealed the
need for regular monitoring of drinking water, especially water from household well