Selangor exco member Hee Loy Sian attributed this to the quick action by the Selangor water management authority (LUAS) and relevant agencies.

He said they managed to control the pollution without affecting the operation of two water treatment plants in Semenyih LRA and Bernam River.

Any stoppage of these plants would have resulted in water cuts for consumers, he said.

In the first incident, LUAS conducted a thorough investigation at a plastics factory in Beranang after a fire incident that went viral on social media.

Hee said LUAS contained the pollution using three oil booms in the main drain until the fire brigade had extinguished the blaze. They also used activated carbon to remove the unpleasant odour before the water entered Sungai Kabul.

In the second incident, Hee said LUAS took action after receiving information regarding diesel oil pollution in Slim River. There was the potential danger of the river water affecting the operation of the water treatment plant downriver.

“Continuous monitoring was carried out and there was no impact or foul smell in Sungai Bernam, the main source of water supply to the Bernam plant,” he said.