City council head of parks Andrew Rutledge said it has been aware of the group staying on land near Brooker Ave, Burwood, since April 1.
Rutledge said the council was working with police, Fire and Emergency NZ and relevant social service agencies to ensure the safety of the people camping, local residents and people who use the area.
He said there had been a number of complaints from the community about the presence of the group - and some of their behaviour.
"We are talking daily with the group occupying the land and we're hoping we can get a quick resolution," Rutledge said.
"However, this is a very difficult situation as the land is owned by Land Information New Zealand but managed by the council."
The council said it had to determine if earthquake-damaged red zone land is considered a park, and therefore subject to the 2016 Parks and Reserves Act.
"In the meantime, for health and safety reasons, we are bringing a rubbish skip and portaloos into the area so the group staying there can keep the site tidy and hygienic," Rutledge said.
Dozens of anti-mandate protesters illegally occupied Cranmer Square in central Christchurch for several weeks during February and March before vacating the site on 9 March.
