The Sungai Semenyih water treatment plant has to be shut down again at 4.15pm today when the bund at Sungai Buah gave way after heavy downpour at the upstream of the river in Nilai, said Kumpulan Air Selangor.

According to a statement from its Corporate Communications Department head, Amin Lin Abdullah, efforts are now being carried out to restore the bunds at Sungai Buah and prevent the polluted water from flowing into Sungai Semenyih.

"This bund was created to prevent the odour polluted river from flowing into Sungai Semenyih and divert to a nearest pond using pumps since 24 October 2016," the statement said.

Locations of water supply.

He said all areas in Hulu Langat, Kuala Langat, Sepang and Petaling Districts will experience water interruption until the water treatment plant resumes operations.

Amin said relief water supply will continue to be sent by water tankers to affected areas and critical premises, namely hospitals and dialysis centres, until water supply is restored.

The existing water schedule for Zone 1 and 2 is no longer valid, he added.