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In page Health in Zambia:

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Water supply in urban areas is intermittent, with an average supply of 16 hours per day in 2010.[2] Concerning sanitation, 29% of the urban population are connected to sewers and 30% are served by septic tanks or improved household-level latrines. While these figures are low, they are actually higher than the average access in Sub-Saharan Africa.[1] In rural areas, 46% of the population had access to an improved water source in 2010.[1] 43% of the rural population had access to adequate sanitation in 2010.[1]