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Summar y Environmental contamination by chemical spill or discharge in water is high concern especially in resources of water suppliers. As for chemical contamination accidents in drinking water source, we hereby demonstrate some case studies. In 2012, hexamethylenetetramine contamination was detected by formaldehyde produced in chlorination in drinking water treatment process, which caused a great water suspension in the metropolitan area. Chemical contamination was also found in rivers indoi:10.5985/jec.29.107 fatcat:upwstbejijch5egwbk24s5bja4