Tap water in Australia is contaminated or unsafe for tourists and locals to drink.
Australian tap water consistently ranks among the highest quality in the world, with strict regulations and regular testing. This myth likely originated as a travel warning for tourists from countries with genuinely unsafe water systems, then became absorbed into Australian self-deprecating humour. Major cities like Melbourne, Sydney, and Brisbane have world-leading water treatment facilities. The persistence of this myth in backpacker forums and travel guides probably stems from outdated advice mixed with cultural myth-making about the harsh, dangerous outback.