The Liverpool State Emergency Service have been left frustrated by people driving in floodwaters after more than 300 millimetres of rain lashed the region over the weekend forcing Moorebank, Chipping Norton, Holsworthy, Picnic Point, Pleasure Point and Sandy Point residents to evacuate.
The Georges River at Liverpool Bridge is estimated to have peaked near 5.40 metres early Monday morning with major flooding forcing several roads to be closed including Hoxton Park Road and the Hume Highway.
River levels at Milperra are now higher than during the 1988 flood and major flooding is impacting other areas such as Warwick Farm and Chipping Norton.
The Liverpool SES has received 383 requests for assistance and have been hampered to attend these requests by the sheer volume and size of requests, significant flooding, closed roads, traffic and generally dangerous conditions.
"The safety of our volunteers is extremely important. We also has to divert our limited resources multiple times yesterday to attend flood rescues and close roads as people continue to ignore warnings not to drive through floodwater," Liverpool SES posted on Facebook.
"We currently have SES teams in the field and are receiving assistance from the RFS and NSW Fire and Rescue.
"We are working through requests as we can. If you have suffered roof damage we recommend you contact insurer or strata who may also be able to arrange a 'make safe' team to do repairs.
"If you no longer require assistance, please contact 132 500 and cancel the request."
The deluge is not over yet, with heavy rains and damaging winds again forecast to lash Sydney and the state of NSW tonight.
NSW Police Assistant Commissioner Karen Webb urged drivers to take caution and avoid floodwaters.
"There are currently hundreds of calls for assistance, including trees, boulders or power poles down onto cars and homes, and across roads, as well as power outages and localised flooding impacting various roads and traffic lights," she said.
"I'm disappointed that I need to remind people to act responsibly and not to take risks in these types of conditions, especially when around floodwaters."
Dams around Sydney, including the major Warragamba Dam, are swelling to their highest levels in years.