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(Date of acceptance : 09.09.86) Abatma r The general bacterial population of treated water in the Kandx distribution system was studied. The mean total viable counts at 35O~ and 20 C were found to be 80/ml and 1291rnl respectively. The mean total viable counts at 35O~ and 20O~ were not significantly different. The frequency of detection of coliforrns was increased to levels up to a total viable count of 500lrnl but decreased thereafter. Potable water of good bacteriological quality is generally associated with attainment of less than one total coliform/100 ml of water. Yet there are many other micro-organisms common to the flora of finished water whose numbers far exceed those of the coliform group. Some of these organisms may be a factor in creating health problems in very young and the debilitated persons in a c~rnrnunit~.~~' In addition high non-coliform population in finished water have been implicated in suppressing coliform growth in test media.' t3f5 Even though water treatment is adequate and Clp disinfection is provided, quality could deteriorate in the distribution system as a result of growth of organisms other than detectable coliforms. Unless there is considerable collection of data within a country the total microbial count is difficult to use as a water quality standard. This study provides data with regard to the levels of non-fastidious heterotrophic bacteria in treated water in one of the main water distribution networks in Sri Lanka.

Total viable count of treated water in the Kandy municipal distribution system