If plastic grades are mixed, the risk is plastic which can be recycled will end up in landfill.
Joint Waste Futures Committee chairman Tania Kerr says the real issue is how much plastic is produced.
"Hastings and other councils are collectively involved in moves at the national level to have changes made to packaging."
"But to help reinforce that, council is encouraging residents to apply pressure as consumers."
"That means reducing how much plastic we buy and, when we have no choice but to buy it, making sure we choose plastics that can and will be recycled whenever possible."
In Hastings the rule, from May 1, is plastic bottles 1-2, lids off, washed and squashed.