LABIS: A four-year study on water quality at several rivers here affected by an aluminium dross dumping incident in 2006 has detected the lingering presence of chemical substances. The research, conducted by Universiti Malaya, found concentrations of phosphorus, copper and manganese in the water samples collected at six locations. Villagers have been advised against drinking water directly from the rivers and wells.“ However, the water may be utilised for non-potable usage such as cleaning, wate