People living at Verdana Court in Whippendell Road say the problem could have been avoided if a leaking pipe had been fixed sooner.
Residents found their cars sitting in sewage on Thursday May 12 after a pipe disintegrated in the underground car park of the block of 11 flats.
They had to move their vehicles out of the car park and clean them, while the smell affected the whole block.
The pipe was not fixed until the following Monday.
Tenants said the pipe had been leaking for a week before bursting and they had contacted Hightown Housing Association, which manages the flats, but nothing had been done.
Mohammed Abbas, 30, who lives in Verdana Court with his wife and two kids, said: “The whole block called them. If they had come when the leak began the burst might have been avoided.
“We could smell it from our apartment, we shut the windows and we could still smell it. It is disgusting, especially for those who have children.”
Hightown confirmed it had been informed of the leak on Saturday May 7 and had contacted the car park freeholder, who did not arrange for a contractor to repair the leak during the following week.
After the burst, Hightown decided to step in and arrange for its own contractors to attend.
Residents said on Wednesday that, although the burst had been fixed, they could still smell the sewage.
A spokesman for the housing association said: “We are sorry that our residents had to suffer this experience, but we were able to step in as soon as we realised there was a problem.
“Hightown’s contractors were arranged to stop the flow the same day and an external clean was carried out.
“It’s been inspected by the council’s environmental health team, who have confirmed they are happy with the situation.”