Reuters writes that a study released by the International Water Management Institute (IWMI) on Monday said “cities in developing countries around the world are using untreated or partially treated wastewater for agriculture, posing serious health risks to urban consumers. … The study looked at 53 cities in Latin America, the Middle East, Africa and Asia. [The report …] found 80 percent were using untreated or partially treated wastewater. ‘In over 70 percent of the cities studied, more than half of urban agricultural land is irrigated with wastewater that is either raw or diluted in streams,’ the institute said. At the same time, the IWMI noted that wastewater agriculture contributes to urban food supplies and helps provide a livelihood for the urban poor.
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Source: http://web.worldbank.org/WBSITE/EXTERNAL/NEWS/0,,d