Syarikat Air Negeri Sembilan director Yazid Ahmad said the river in the affected forest area was the main source of water to the Linggi water treatment plant from where it is channelled to Springhill.

At certain times, the plant had to reduce or stop the water pump operations to maintain the quality of drinking water, he said. The water could not be treated if the turbidity (level of suspended particles in the water) exceeded a certain level.

It may take at least five to six hours or half a day for the water turbidity to change. The river water becomes turbid due to foreign particles like fine sand,” he told reporters at the Pantai water treatment plant here today.

Yazid said improvements were being made to the Linggi water treatment plant to supply more water to the affected areas.