TWO Common Ef fluent Treatment plants (CETPs), 86 dyeing and washing units attached to these CETPs and an Individual Effluent Treatment Plant (IETP) were closed down by the Tirupur branch of the Tamil Nadu Pollution Control Board (TNPCB) on Wednesday, as the units were found to be discharging effluents into the Noyyal river.

Based on complaints, a team of TNPCB officials, led by District Enviro