Sewage has been ‘bubbling and gurgling’ in homes and contaminating grass where children play.
Parents have called on housing association Affinity Sutton to fix the drains in Dorsten Place, Bewbush.
Rebekah Dodds, 24, who has a two-year-old daughter, said: “Sometimes it comes up in my flat’s plug-holes. It bubbles and gargles. It absolutely stinks.
“All of us have rung up and complained and they come out and do the drains but they pumped it from one drain to the other and it’s all been coming out the back.
“Kids play around there.”
She said the leaks happened every six weeks at least and the housing association told residents they were blocking the drains with nappies and baby wipes.
Rebekah added: “They are saying that it’s the residents’ fault but people who aren’t doing it are suffering for it.”
The new-build block is made up of 12 flats.
The ‘rotten egg’ smell lasted for up to three days each time.
Rebekah’s mother Cheryl Dodds said: “I’m fuming that this housing association think it’s okay to allow this to continue.
“The majority of them are young single mums.”
She added: “My daughter and granddaughter are always poorly and I’m sure it’s down to the poor sanitation there.”
Affinity Sutton has been approached for comment but has yet to respond.
A spokesman for Crawley Borough Council said the council did not deal with the sewage problem and added ‘the housing association should deal directly with Thames Water to resolve the issue’.
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