Indication of Fecal contamination of water is due to presence of – a) E. colib) Coliformc) Enterococcid) Clostridium difficilee) Streptococcus pyogene

Bacteriological indicators of water contamination Presence of following organism indicate fecal contamination of water. Coliform : by all practical point of view it is assumed that all coliform are fecal in origin unless a non-fecal origin can be proved. Fecal streptococci or enterococci : They regularly occur in feces. Finding of fecal streptococci in water is regarded as important confirmatory evidence of recent fecal contamination water. Clostridium perfringens : They also regularly occur in feces. Presence of spore of Cl. perfringens and absence of coliform group indicate remote contamination of water.