THE Environmental Protection Authority has stated that the smell offending residents at St Clair, Erskine Park and St Marys is not toxic or harmful to people.
Since April, 18 unannounced odour audits, late-night surveys and site inspections have been conducted around Eastern Creek to identify its source.
Waste Assets Management Corporation was fined $1500 for inadequate coverage of waste and problem with Eastern Creek Landfill's gas-extraction system.
The licensee was instructed to cover waste at the end of each day and provide timeframes to fix the gas-extraction system.
The complaints prompted state Smithfield MP Andrew Rohan to write to environment minister Robyn Parker.
"The EPA is committed to ensuring odours do not affect the community and will continue to undertake audits and take strong regulatory action if facilities cause odour impacts off site," she wrote.
Mr Rohan said: "I realise it's a nuisance but audits need time. My office will keep in touch with residents and continue to work with them until this is put to rest."