sentences:  The health impacts of inadequate sanitation can be serious, as evidenced by the estimated 1.5 million cases of diarrhoea in children under five and the 2001 outbreak of cholera.While most coliforms are harmless to human health, the presence of E. coli, which covers approximately 97% of coliform bacteria found in the intestines of animals and in faeces, underlines the presence of more harmful pathogens in the water system (DWAF 1996b).Service quality is highly variable and data is sketchy.