The Litter Act 1979 is New Zealand's main law for controlling litter. For businesses, it is broader than obvious dumping or fly-tipping. It can apply where litter is left in a public place, put on private land without consent, or allowed to escape from a vehicle or trailer.
The Act also gives public authorities and Litter Control Officers practical powers. Those powers include requiring clean-up, requiring identifying details in some situations, requiring occupiers to take reasonable steps to stop litter escaping from premises, and requiring bins near premises where excessive litter is attributable to or emanates from them.