Proportion of households with access to a source of safe drinking-water
Sources of safe drinking-water include boreholes, protected wells and protected springs, adequately treated and prope distributed surface water and rainwater collected on clean surfaces and properly stored. Safe drinking-water is defined by the World Health Organization as water that 'does not represent any significant risk to health over a lifetime of consumption, including different sensitivities that may occur between life stages. Those at greatest risk of waterborne disease are infants and young children, people who are debilitated or living under unsanitary conditions and the elderly. Safe drinking-water is suitable for all usual domestic purposes, including personal hygiene. In the context of emergencies, drinking- water may be considered safe when: 1) A sanitary inspection indicates a low risk of faecal contamination, 2) There are no faecal coliforms detectable in any 100-ml sample, 3) For piped water supplies, or for all water supplies at times of risk or presence of diarrhoea epidemic, water is treated with a disinfectant so that there is a free chlorine residual at the tap of 0.5 mg per litre and turbidity is below 5 NTU, 4) No negative health effect is detected due to short-term use of water contaminated by chemical or radiological source and assessment shows no significant probability of such an effect.