The death will be referred to the Coroner.
It is the third water-related death in the North Island in the past 24 hours.
Earlier today, a person drowned at a lake near a beach southwest of Auckland.
Emergency services were called to Lake Puketī, near Karioitahi Beach, just before 11am.
"Police and emergency services are at a reported drowning at Lake Puketī," police said.
"Sadly, one person has died at the scene."
St John said they had treated a second person in a moderate condition.
The death will be referred to the Coroner.
Meanwhile, a body of a missing teen was found at Lake Arapuni, in the Waikato, late this afternoon.
A police spokeswoman said police received a report of a person missing in the water at the Jones River Landing area at Lake Arapuni about 8.25pm yesterday.
The Police National Dive Squad conducted a search today and the body was recovered.
The death will be referred to the Coroner.