Abstract
During the period September 1991 to February 1992 standard chlorination packages of calcium hypochloride were provided for the first time to 171 families residing in the catchment area of the Sabt-Bany Bishr Primary Health Care Centre in the rural areas of the Asir region, south-western Saudi Arabia. The villagers added the packages to their home storage water tanks each time they added water from the 220 nearby wells. Analysis of the water samples taken from these wells showed that all of them were bacteriologically unfit for human use. By the end of the study period there were no bacteriologically unfit water samples taken from the tanks of the participating families. Children under 5 years of age whose families were not using chlorinated water had twice the risk of diarrhoea compared to children from the participating families (odds ratio = 1.98, P = 0.047). The use of chlorinated water was associated with a 48% reduction in diarrhoea. These results indicate that the chlorination of water can be successfully carried out locally in rural areas to improve the health of the population.