Evaluation of Microbial or Bacterial Quality of the Drinking Water of Duba Province North Saudi Arabia

This research was conducted to measure the bacteriological contamination of drinking water in Duba Northern Province, Tabuk, Saudi Arabia. 93 water samples were collected randomly which were 30 samples of mineral water bottles representing five brands, 40 samples tap water, 20 sample local desalinated water and 3 samples of agricultural wells water. MacConkey broth was used for counting total coliform and ？faecal coliforms wheras plate count was used for detection of other non coliform bacteria. The results showed that coliforms were detected in samples taken from local desalinated water, tap and well water at percentages of 60%, 25% and 67% in order. No coliforms were detected in bottled water samples. Fecal coliforms were identified as Klebsiella sp. Streptococcus faecalis. The isolation percentage were 30%, 3.33% and 67% for local desalinated water, tap and well water in order.Non coliform bacteria were isolated from different water samples (local desalinated, tap and well water) and were identified as, P. aerugnosa, Staphyllococcus epidermis, S. aerus. Klebsiella sp. and P. aerugnosa recorded the highest count percentage when compared to the other genera . Among the different resources well water showed the highest bacterial contamination followed by local desalinated and then tap water