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Prevalence and Characterization of Water Contamination Indicator Bacteria with Special Reference to Coliforms from Drinking Water Supply in Solan City of Himachal Pradesh

Monika Thakur*, Sushila Negi** Amit Kumar**, Sandip Patil**, Ajay Kumar* and Neha Sharma*

Journal Title:Biological Forum-An International Journal

ABSTRACT : Water becomes contaminated with enteric pathogens such as coliform group of bacteria viz Salmonellae, Vibrio and dysentery causing bacilli. The human faecal material carried along with domestic sewage is often dumped in rivers and lakes leading to water contamination. The present study was undertaken to detect the enteric pathogens and to measure the extent of drinking water contamination with the pathogenic microorganisms. Water samples were collected from different areas of Solan city in Himachal Pradesh. Most probable number (MPN) test was performed to detect the coliforms in water samples collected from surface water sources, hand pumps, taps, roof top storage tanks and aqua-guards. Chlorination of some water samples was done to see the effect of chlorine on bacteria. The indicator organisms isolated were E. coli and Enterobacter aerogenes. E. coli and Enterobacter aerogenes are the characteristic of intestinal tract of man and animals. The study reveals that surface water and roof top storage tank water was more liable to contamination whereas, ground water and aqua-guard water was safer for human consumption. Chlorine was effective in removing these bacteria from water.