“To those who were there, including emergency responders, we acknowledge the impact this will have on you as well. Aroha nui to all who are affected.”
Emergency services were called to the park at about 8.10pm.
“CPR was undertaken but sadly, the child could not be resuscitated,” a police spokesperson said.
Police said the death would be referred to the coroner.
Avalon Park, which had a $3.7 million upgrade in 2016, includes a boating pond which runs to a depth of around a metre.
Sign up to The Daily H, a free newsletter curated by our editors and delivered straight to your inbox every weekday.