Further Analysis on Quality of Drinking Water in State of Perak

Quality of drinking water from 10 sources was determined by analyzing parameters that could deteriorate the water quality. The parameters that were studied are pH, conductivity, total suspended solid (TSS), total dissolved solid (TDS) and heavy metals such as Cd, Cr, Pb, As, Hg and Sn. The metals were analyzed using standard methods approved by APHA. The results from the analysis were then compared with drinking water quality standards such as guidelines from WHO, USEPA and local standards that are NDWQS and NWQS. All parameters were found to be within the limit set by those bodies except for Sn in samples from certain locations that had exceeded the maximum allowable concentration. Thus, water from all the locations were found to be safe as drinking water by means of all the parameters analysed were within the standard limit. Exception is made to the exceeding of Sn concentration in five samples because Sn is not considered to be primary or secondary pollutant for drinking water and possessing very low risk of harming human health.