The municipal corporation in a statement said that they threatened to block the connection permanently if the landlords of the area did not take proper black water management measures.
The mayor lamented the illegal blackwater lines connected to lakes and surface drains in the higher reaches and said he would extend the drive to Banani and Niketan.
After launching the campaign in Gulshan on January 4, 3,265 out of 3,830 houses in affluent areas see black water flowing directly into drains or lakes.