KUALA LUMPUR: Water supply has been restored to 210 of the 274 areas affected by the disruption following the emergency shutdown of the Bukit Tampoi and Sungai Semenyih Treatment Plants.
Pengurusan Air Selangor Sdn Bhd (Air Selangor) said 77 per cent of the areas affected had their supply restored.
"The other 64 areas are in the process of getting their supplies back," it said in a statement today.
At 4pm, water supply was back in Petaling district (65 per cent), Kuala Langat (76 per cent), Hulu Langat (81 per cent) as well as Sepang and Putrajaya (84 per cent).
In an earlier statement, the state-owned utility company also said that the Bukit Tampoi Treatment Plant was reactivated at 9.45am today.
This follows three consecutive samplings conducted where a Threshold Odour Number (Ton) reading of zero was achieved.
This is the requirement for the reactivation of the plant.
Air Selangor chief executive officer Suhaimi Kamaralzaman said water supply was expected to be fully restored by 6pm on Friday.
Odour pollution had forced the utility company to shut down the Sungai Semenyih and Bukit Tampoi water treatment plants on Sunday afternoon.
The shutdown had resulted in taps running dry for 1.3 million consumers or 309,000 ratepayers from 274 areas in the districts of Petaling, Hulu Langat, Kuala Langat and Sepang.
On Monday, Environment and Water Minister Datuk Seri Tuan Ibrahim Tuan said the odour pollution was suspected to have originated from the Nilai Industrial Estate in Negri Sembilan.
He said preliminary investigations found the polluted water had entered Sungai Semenyih from Sungai Batang Benar, which is close to the industrial area.
Selangor state exco Hee Loy Sian had said that a duck and chicken farm near Sungai Pajam was also one of the establishments under suspicion as it had done a major clean up on the morning of the incident.
The latest disruption came on the heels of a similar incident last month that affected 1,292 areas in the Klang Valley, Petaling, Klang/Shah Alam, Kuala Selangor, Hulu Selangor, Gombak and Kuala Langat for almost a week.
At the time, Air Selangor reported that pollution at Sungai Gong, the raw water source for Sungai Selangor water treatment plants in Phases 1, 2 and 3, as well as Rantau Panjang had forced the plants to shut down.
For updates and a list of recovery schedule by location and locations for alternative water supply visit www.airselangor.com (http://www.airselangor.com/), Air Selangor's social media sites, or download the Air Selangor app from Google Play or the Apps Store.