Bacteria ICMR ISI WHO BMHC MWBLC Water with class   Coliforms 0 0 0 0 0 Excellent - - - 1-3 1-3 Satisfactory - - - 4-10 4-10 Suspicious 10 10 10 10 10 Unsatisfactory   E.coli 0 0 - 0 0 Excellent - - - - 1-3 Suspicious - - - 1 3 Satisfactory Legend (-) : Not prescribed ICMR : Indian Council for Medical Research ISI : Indian Standards Institute WHO : World Health Organization BMHC : British Ministry of Health Classification MWBLC : Metropolitan Water Board London Classification

Table 4: The water quality standards and rating by different agencies for coliforms and E.coli.