The team played six round-robin games held at Blenheim’s Marlborough Lines Stadium 2000 and went through the rounds undefeated.
A fierce contest in the final against Marlborough Girls’ College saw the Rangi side stay composed to take the game and title with a 7-6 win.
Rangi retained the title they won last year and students Aggie Weston and Hayley Bond were named in the tournament team.
The team’s South Island title came a week after they beat St Margaret’s College to take out the Canterbury title.
Rangi’s director of sport Mandy Anderson said she is proud of the water polo programme at the school which has been developed over the last two years.
“I’d like to acknowledge all of our coaches, and particularly Zoli Boros, the New Zealand men’s and secondary schoolboys water polo coach, who is a significant addition to our coaching talent at Rangi.”
