Water Safety NZ head Matt Claridge said with summer fast approaching, it was even more important for youngsters to be confident around the water.
"It's making a huge difference and equipping a whole generation of Auckland kids with the skills they need to swim and survive when they're in and around the water."
Sylvia Park School, in Mt Wellington, has seen a huge improvement amongst its students' swimming skills since signing up to the programme in 2011.
Yesterday, pupils eagerly jumped into the water ready to start a new lesson.
Sports co-ordinator and teacher Hayden Cleere said the progress they had seen in students' performance was, in many cases, staggering.
"It's quite amazing. We have kids who, at the beginning, are absolutely too scared to hold their breath underwater for two or three seconds - or even put their heads underwater.
"At the end of term, they can do anything from two freestyle strokes or even one or two lengths of the pool. They're ... confident; and that's what we're trying to achieve."
Mr Cleere said the aim was for every student to leave primary school with the ability to swim at least one length of the pool.