Abstract: The quantitative study of bacteria in bottled purified drinking water was carried out.The bottled water samples in plastic containers of five gallons and 600ml were collected from the bottling factory and were stored at indoor temperature.Three hours after being bottled,the total colony count was determined every 24-56 hours in up t0 35 days.The bacterial quantities of all the studied water samples in 600 ml bottle increased in numbers and reached a peak with the total colony count ranging from <1 ml-1 to 1 .53 ×103ml-1 by the end of about one week.After then.the baterial count ran a fluctucting course of two peaks .The same occurred in the five gallons samples.

Key words: Bottled purified drinikng water Bacteria Quantity Storage time