Residents of Parramatta's tallest tower complex have been told to evacuate some apartments after septic sewage began leaking into the premises on Tuesday night.

Meriton, which manages the $450 million Altitude towers on Church Street, told the Herald that four residents were affected by a plumbing incident but said it was an isolated issue.

The two Altitude towers, completed in 2017, rise 36 and 53 storeys high. Credit:Meriton

One eighth floor resident, who asked to remain anonymous, said his brother stayed awake all night throwing out buckets of water as the sewage seeped into their apartment, after they notified building security of the leak at 7.30pm on Tuesday.

He said about midday Wednesday "we were informed that we will have to be kicked out of our apartment, with no promise of a compensation".