Pools are part of the culture in all parts of Australia. Even the outback. It's just so warm all the time that pools make sense everywhere. If there's pools everywhere it means people are scared (or excited) and teach their kids to swim.
Part of the culture and part of the school curriculums in all states. Swimming classes, swimming as a sport and swim carnivals are offered at various grades throughout primary and secondary school.
Yeah but did that come before people started being able to build pools? Probably? For the beach maybe, but people wouldn't have been learning to swim inland til pools were popular I reckon.