Malaysia probes recycling plant over river pollution in Semenyih

A recycling plant in Mahkota Beranang, Semenyih, is under investigation for causing odour pollution in Sungai Semenyih. The incident triggered swift action from the Langat Centralised Sewerage (LUAS) to prevent disruption to water supplies. Authorities confirmed the pollution was detected on May 3, prompting immediate measures to contain the issue. The pollution originated from the factory’s discharge, which flowed into Sungai Kabul before affecting Sungai Semenyih. LUAS recorded a threshold odour number (TON) of two, indicating noticeable contamination. By 8pm on May 4, no abnormal odour remained in either river.

LUAS took quick action to mitigate the problem. This included applying 100kg of activated carbon to neutralise the smell. The agency also ordered the plant to halt discharges and carry out urgent cleaning and control efforts. The facility is accused of violating Selangor’s Zero Discharge Policy (ZDP) by failing to meet licensing conditions. LUAS has launched an investigation under Section 79(4) and Section 59 of the LUAS Enactment 1999. During the incident, LUAS ensured an uninterrupted water supply by providing up to 770 million litres per day of raw water directly to the Sungai Semenyih Water Treatment Plant (WTP).

LUAS will keep monitoring Sungai Kabul and Sungai Semenyih to prevent further pollution risks. The recycling plant remains under scrutiny for non-compliance with environmental regulations. Authorities have confirmed no lingering odour issues in the affected rivers as of May 4.