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This indicator is part of the FAO Suite of Food Security Indicators -- Dimension: utilization (http://www.fao.org/economic/ess/ess-fs/ess-fadata/en/#.WTlX9BPytPU). it measures the share (%) of the total population with access to improved drinking water sources. Access to an improved water source refers to the percentage of the population with reasonable access to an adequate amount of water from an improved source, such as a household connection, public standpipe, borehole, protected well or spring, and rainwater collection. Unimproved sources include vendors, tanker trucks, and unprotected wells and springs. Reasonable access is defined as the availability of at least 20 liters a person a day from a source within one kilometer of the dwelling. . The indicator -- originally compiled by the WHO/UNICEF Joint Monitoring Programme (JMP) for Water Supply and Sanitation ( wssinfo.org ) -- is also available on the World Bank site (http://data.worldbank.org/indicator/SH.STA.ACSN) (Source: Faostat - http://www.fao.org/faostat/en/#data/FS).