A young boy has drowned at a property in Makarau, north of Auckland, this afternoon.

A St John spokeswoman said emergency crews were called to a private residence shortly after 3.30pm.

It is understood the child is a toddler, around 21-months-old.

An Auckland Westpac Rescue Helicopter spokeswoman said emergency services were performing CPR on the toddler when the helicopter crew arrived after 3.45pm.

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She said the crew's doctor and paramedic took over treatment, but the boy was unable to be revived.

She said the boy had drowned in a swimming pool.

A police spokeswoman said police were making inquiries.