| http://www.w3.org/ns/prov#value | - These risks are not limited to official wastewater but often also apply to rivers and other open water sources, as indicated by figures gathered by Westcott (FAO, unpublished, cited in Birley and Lock, 20001999): 45% of 110 rivers tested carried faecal coliforms levels higher than the WHO standard for unrestricted irrigation.
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