"There ended up being 10 to 12 people, it was a huge reaction just amazing - it was a joint effort."
She said it took a while to discover where the man was because he was sinking in the fresh water, but no one hesitated to bring him ashore. She said the man was struggling in the water after experiencing cramp.
"Everyone pitched in to get him out and the campers were just amazing and stayed with him and kept him warm. Cushla Hagan (a camper) was particularly amazing. She stayed with them the whole time and drove his family to Whangarei Hospital," she said.
Police, fire and ambulance attended the scene. Michael Ross, Dargaville Fire Brigade deputy chief fire officer, said the man was coming in an out of consciousness and was airlifted by the Northland Electricity rescue helicopter to Whangarei Hospital.
Manager Andrew Howells said Ms Hagan and the Hagan family "went out of their way" and stayed with the family until they knew the man was okay.
Mr Howells said only hardy campers were left after the storm and while the actual water incident was not good the reaction from campers boosted the morale at the campsite.
Saving the man's life prevented a horror start to the year in Northland for drownings.
At least 12 people drowned in Northland last year - with the last involving an 82-year-old woman who was found dead in a pond in Kerikeri on Boxing Day - the same as in 2014 and two fewer than 2013.
At least seven people have drowned nationally over the Christmas/New Year holiday period.