An unknown driver who dumped 25 bags containing more than four tonnes of asbestos in the driveway of a family home faces fines of up to $1million.

In shocking CCTV footage the truck pulls up to the driveway of an Oatlands home in Sydney's northwest and dumps the bags before speeding off at 9:17 on Friday night.

The truck was filmed passing the house, then turning around and passing the house for a second time before the driver eventually stops to open the truck's tailgate.

An unknown driver dumped 25 bags containing more than four tonnes of asbestos in the driveway of a family home (pictured) before speeding off into the night in Sydney's northwest

The driver made several attempts to reverse the truck before tipping the bags onto the driveway, some of which split when hitting the ground.

Hearing a loud bang and thinking a car had crashed into the house, Armanii Haddad who was looking after four children inside the home, rushed outside.

Eighteen-year-old Armanii, her 14-year-old brother Tony and 12-year-old sister Natarsha ran outside where they touched and breathed in the asbestos building material.

'All we saw was a big truck dump a whole lot of God knows what, then me and my younger sister ran out and we were touching it and breathing it in,' Armanii told 9 News .

Eighteen-year-old Armanii, her 14-year-old brother Tony and 12-year-old sister Natarsha (pictured) ran outside where they touched and breathed in the asbestos building material

Specialist Fire and Rescue NSW HAZMAT crews were called to the scene where the bags were sealed and covered in plastic to 'contain it and render it safe', Adam Dewberry from NSW Fire and Rescue said.

As the rubbish was dumped on private property, the home owner will need to pay for its removal.

'I think the street might have been chosen because of its secluded nature,' a neighbour told 9 News.

The occupants have said they have no idea why their house was chosen.

Investigators are continuing to search for the driver of the truck who could face fines of up to $1 million.

The driver made several attempts to reverse the truck before tipping the bags onto the driveway, some of which split when hitting the ground