الفهرس 
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Abstract
E.coli is the member of the coliform group that contains most of the criteria for an ideal bacterial indicator of fecal pollution. So E. coli is regarded as the most sensitive indicator and the most appropriate tool of fecal contamination in water, soils and plants.
The obtained results shown that the total coliforms (TC), fecal coliforms (FC) and fecal streptococci (FS) were high in raw water samples than sedimented water. While the treated water showed the complete absence of total coliforms (TC), fecal coliforms (FC) and fecal streptococci (FS). MPN of TC varied from 14200 to 4500/100 ml and from 12000 to
2100/ 100ml water for FC.
According to the guideline criteria for fecal indicator organisms of (WHO, 1992),which accept the guide values of the investigated bacteria up to 500/100 ml for total coliforms and 100/100ml for both fecal coliforms and fecal streptococci. The survey of the indicator of the indicator bacteria in waters revealed that the Nile waters at this branch is subjected to sewage pollution.
Fifty pathogenic bacterial isolated obtained from raw water samples were dentified. The most prevalent organisms isolated. The most prevalent organisms isolated were coli, Klebsiella spp., pseudomonas spp., proteus spp., proteus spp., shigella spp., Efecalis, Staphlo coccus. In the present study , the isolates were differentiated and confirmed biochemically as E . coli, which the main indicator of fecal pollution, which constitute 30% of the identified gram-negative bacteria in the examined water. This exaplained that the water is subjected to sewage pollution.