The largest number of drownings happen at beaches with the biggest killer immersion incidents, followed by swimming and powered boating.
The Auckland Coastguard receives an average of 600 callouts a year, while NZ Police search and rescue carry out about 85 water-related callouts.
"Auckland has had rapid population growth and water safety services are scrambling to keep up with demand. These are largely volunteer based organisations facing significant challenges."
Water Safety New Zealand is working with Drowning Prevention Auckland (DPA) and other partners in the region to develop an Auckland Regional Water Safety Strategy to raise awareness around water safety and address the challenges specific to Auckland.