Up to nine Lismore flood survivors travelled from the flood-ravaged northeastern town with a tip truck of flood-destroyed possessions to Kirribilli House in Sydney on Monday morning.
The action is a protest against the federal government's response to the recent "climate fuelled mega-floods" on the east coast, the group said in a statement.
Organiser Naomi Hodgson told AAP the residents planned to dump the detritus "as long as we're not thwarted".
The dumped goods included children's toys, clothing, furniture and carpet destroyed by the flooding.
A member of the group, Kate Stroud, said she sheltered in her roof cavity for six hours in the floods before being rescued by a civilian jet-ski and had lost everything.
"We've interrupted our clean up and travelled more than 700 kilometres to the prime minister's residence to hold him to account," she said in a statement.
"When (Prime Minister Scott) Morrison came to Lismore, he was too cowardly to front the community outside his curated media stunt, because he knows that he's again failed in a crisis and people are furious."
Mr Morrison has promised to open the chequebook and cut red tape for business and welfare support for those affected by the disaster in NSW and southeast Queensland.
The federal government has come under fire for its handling of the unprecedented flooding, with Lismore residents claiming it was too slow to help deal with the clean-up efforts.
An extra $742 million in joint federal-NSW flood recovery funding was announced for northern NSW last week, pushing the total federal and state package for the state to $1.7 billion.
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