The evidence: Water in sand dams is clean

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London School of Hygiene and Tropical Medicine MSc study suggests sand dam water is safe according to WHO standards
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The median number of WHO indicator bacteria per 100ml of water stored in sand dams was zero

A Microbial Analysis of Water Stored in Sand Dams - London School of Hygiene and Medicine MSc study

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83% of sand dams stored completely safe drinking water, according to WHO standards. 17% presented very low risk.

A Microbial Analysis of Water Stored in Sand Dams - London School of Hygiene and Medicine MSc study

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