Riversdale Surf Life Saving club hasn't lost a life since 1955 in patrolled areas, and with this year's drowning toll climbing nationwide, people are being warned to swim between the flags.
Eight people in New Zealand have drowned over the past four days, making the national death toll 100 for the year, compared to 90 last year.
Riversdale SLC secretary Dave Rose "can't stress enough" the importance of swimming between the flags at all times.
"There's a lot of people who just walk out in front of their beach houses and swim 200m away from the flags because it's more convenient to them," he said.
"Now if someone gets into difficulty, it could take two or three minutes for us to even be told there's an issue and get down there in a quad bike or run, and by that time it could be all over.