The goal sparked wild scenes and set up a penalty shoot out, which the hosts came from behind to win 4-3.
Marist managed to turn the tide in the girls' final, dominating for long periods on their way to a well-deserved 2-1 victory.
The Tauranga girls' under-14 division one side finished second in Wellington, prolonging a long wait for gold.
Tauranga Water Polo administrator Dallas Coubee said 64 matches over four days of competition had made for a hectic but enjoyable spectacle.
"It's been a good tournament; long, but really good," she said. "There's been a lot of good play and the coaches and managers have all been really friendly."
She expressed disappointment at her club missing out on the gold in both Tauranga and Wellington on the same day, but said the division two competition had been a great learning experience for the younger players.
"Our C team here is all under-12 and it's a good experience for them ... when they reach the under-14s they will be a bit stronger for it.
"It is tough on them but some of the other teams have 12-year-olds as well."