A 26-year-old woman who was injured in a plane crash at Raglan yesterday remains in hospital in a serious but stable condition.

The Piper Cherokee she was in crashed into water around 100 metres offshore, narrowly avoiding people in the water.

The woman was originally reported to be in a critical condition, but after being treated in the emergency department at Waikato Hospital she's been stabilised.

A 23 year-old and a 46 year-old man who were also on board were treated for minor injuries.