A dumped filing cabinet filled with tell tale paperwork has led WA's environmental watchdog to catch and fine a Perth man $10,000 for illegal dumping.

The Department of Environment Regulation's Illegal Dumping Program tracked down 27-year-old Iain Joseph Mintern from Joondanna for the crime after he tipped a truck load of rubbish in the middle of a Malaga road.

The rubbish was dumped in the middle of a road in Malaga in 2016. Credit:DER

The load of household junk included a filing cabinet stuffed with paperwork, as well as furniture, garden waste, a bicycle and cardboard boxes.

The load was dumped in the middle of Camboon Road in Malaga on June 6 last year - and it didn't take long for DER investigators to track Mintern down.