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Water resources as rivers and lakes are natural sources of water for human and animal usage1. Polluted water reservoirs containing a large variety of pathogenic microorganisms including viruses, bacteria, and protozoa are mainly originated from the direct and indirect release of feces from humans and warm-blooded animals. The sanitary danger of polluted water usage depends on the purpose of use, type and concentrations of pathogens2. According to a joint monitoring programme by WHO/UNICEF in Bangladesh, the percentage of populations using improved drinking water sources are 85% and 78% in urban and rural inhabitants, respectively, in the year 2006. The rest are using unimproved drinking water sources including unprotected dug well, spring, small cart with tank/drum, tanker truck and surface water including river, dam, lake, pond, stream, channel, irrigation channel3. Water borne diseases are the main reason of morbidity in many developing countries2. Therefore, regular monitoring of surface water quality is required in both urban and rural areas to provide information for continuous government interference.

Seasonal variation of bacterial load in river and lake waters of Dhaka city, Bangladesh