PETALING JAYA: The exact cause of the odour pollution that led to the unscheduled water disruption on Friday (July 19) has yet to be detected.
Air Selangor chief executive officer Suhaimi Kamaralzaman said in a statement that since the cause has yet to be identified, a recurrence of this incident is "probable".
"As such, we are not able to provide water restoration estimates.
"Following this incident, the plan for improvement works at the Sungai Selangor Phase 1 (SSP1) Water Treatment Plant (WTP) scheduled for next Tuesday, 23 July 2019, will be postponed," he said.
He said that as of 5pm Friday, the Sungai Selangor Phase 3 WTP had resumed operations.
SSP1 and SSP2 WTPs were in the process of resuming operations, as of 7pm, he added.
"As this incident involves the shutdown of three main plants with a large affected area, Air Selangor has activated the Code Red Emergency Response Plan (Code Red)," he said.
The state government and the National Water Service Commission have been notified of the incident.
A total of 1,133 areas in the Klang Valley involving 1,166,842 customer accounts in Kuala Lumpur, Petaling, Klang/Shah Alam, Kuala Selangor, Hulu Selangor, Gombak and Kuala Langat would be affected by the unscheduled water supply disruption.
Three plants had to be shut down due to odour pollution in the Sungai Selangor raw water source.