Water distribution network is the most significant part in terms of cost and the vulnerability of a potable water system. MIcro organism can enter the pipe system by a variety of routes ranging from insufficient treatment to leakage! faults in the pipes. Pollution occurring during storage and distribution was the main cause of 8 outbreaks out of 21 occurring between 1911 and 1937. Water crisis of Hyderabad is live in minds of the people of Pakistan. Water and Sanitation Agency (W ASA) is responsible for water distribution system in Rawalpindi. Water from Rawal Dam and Khanpur Dam is treated in treatment plants at Chak Shahzad and Sangjani and released in distribution system comprising of ground reservoirs, overhead reservoirs and distribution pipes. Water samples collected from 27 different points of the distribution systems were analyzed for the assessment of bacteriological contamination. Water samples collected from three ground/ overhead reservoirs and seven distribution points were found free from bacterial contamination. Remaining samples have high level of bacterial contamination, which is a matter of great concern. WASA should make immediate remedial measures to decontaminate these water supplies.