It has been a busy start to the new year for lifeguards, as thousands of people take to the northern beaches.
In the North Island, eight people were rescued at Piha, Mangawhai Heads and Muriwai yesterday.
Lifeguards also helped 18 swimmers before they got into serious difficulty.
Lifesaving Manager Ari Peach said in a statement that there were two serious incidents at beaches on Auckland's west coast.
A 14-year-old girl was injured when she was dumped by a wave at Muriwai and minutes later, a 13-year-old girl was barely conscious after swallowing a large amount of water at Piha.
They were taken to hospital by the Westpac Rescue Helicopter.
On the east coast at Omaha, Takapuna, Orewa, Wenderholm and Mangawhai Heads, wayward jetskis proved a problem operating at high speed near swimmers, Peach said.
He said the Maritime Police Unit was informed.