Hi Everyone
Further to my previous post, it can be a debt on the land as long as Council has followed Section 327 of the Biosecurity Act 2015.
https://legislation.nsw.gov.au/#/view/act/2015/24/part20/div3/sec327
Which is registration of any unpaid amount under a cost recovery order in relation to any land owned by the person from whom that amount is recoverable (including any land owned jointly with another person) with the Registrar General.
Robert