To assess quality of Boukerdene Dam’s water (raw water) and treated water at Sidi-Amar’s treatment Station based on the Algerian standards and those established by the World Health Organization (WHO), analyses will carried out on different sampled belonging to the two areas. Studies of physicochemical and bacteriological parameters have focused on measure in situ pH, temperature and turbidity. Then the following parameters were analysed: the elements: NH4+, NO2–, NO3–, PO43–,Ca2+, Mg2+, SO42–, Cl–, HCO3- , OM as well as metal trace metals Fe2+, Al3+. Generally, the conventional drinking water treatment processes employed at this water treatment plant shows an efficiency of OM removal arrives to 79.31%. Total Coliforms, fecal coliforms, fecal streptococci and sulfite-reducing anaerobes were determined. The obtained values will compared with the standard limits. The result of this study reveals that the physico-chemical parameters and bacteriological evidence is within the maximum permissible limit of WHO and the Algerian standards with some slight variations in some parameters. The dam water does not meet the bacteriological quality standards of the surface waters due to the presence of sulphito reductive anaerobic spores. The water analyzed at the exit of the Sidi-Amar treatment plant of Tipaza is of good quality thus demonstrating the effectiveness of the various stages applied at this station. Hence, water is safe and suitable for domestic, irrigation and drinking purposes.

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