Whangarei's fire crews attended four "nuisance" fires on Saturday and are reminding people that burning waste within the city is not allowed.
Whangarei Station Officer Jeremy Hay said people could incur a $1000 fine for burning green and other waste in their backyards.
The Fire Service attended controlled burns where people nearby had complained, Mr Hay said.
"If it's not creating a hazard we don't put it out," he said.
"But if they're caught by the council they can fine them. A lot of people just aren't aware of the local procedures."