The tap water you drink may not be as purified as you may think, as it has been found sometimes to carry health-threatening dissolved organic contaminants that have managed to pass through the multiple stages of wastewater treatment.

According to the World Health Organisation, contaminated water is the cause of more than 400 000 diarrhoea-related deaths in the world every year. The organisation also found that such dirty water may also spread cholera, polio and dysentery.

A South African solution for better drinking water (Mail & Guardian article)