Faecal
Contamination
of
Water
Water gets contaminated with pathogenic microorganisms through intestinal discharges of man and animals. Further more, in the intestinal tract of man and animals, there exists a characteristic group of organism's designated as coliforms.
The coliform group of bacteria includes aerobic and facultatively anaerobic, gram negative, nonsporeforming bacilli which ferment lactose with acid and produce gas within 48 hours at, 35°C. The most common species of this group are various strains of Escherichia coli and Aerobacter aerogenes.
