Background
In developing countries diarrhoeal diseases take a big toll which can be prevented by adequate supply of safe drinking water. Thus a longitudinal study was taken up to determine the morbidity due to water borne diseases and bacteriological quality of water

Method 
150 homes in two areas, one supplied by bore well and other by tap water was selected by modified cluster sampling. Weekly morbidity details collected. Monthly water samples were assessed for bacteriological quality from main supply, household storage and morbidity reported.

Results
The difference in proportion of potable and non potable water storage was statistically significant. Potable water is water which is fit for consumption by humans and other animals. The overall incidence rate of target diseases was 3.58%, majority were diarrhoeal diseases with increased incidence in children less than five years. The incidence in areas with bore well supply was 3.8% and in area with tap water was 3.43%.

Conclusion
There are various ways in which drinking water can be contaminated along the route of distribution to the consumers. The most effective method to prevent infections is surveillance and treatment of drinking water quality at point of consumption.