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back to the office they say… ☠
It’s always a water tower. But 20 years ago it was the whole supply I recall.
Legionnaire’s disease is only really a thing with air-conditioning systems because a) warm water promotes growth of the bacteria, and b) you need to breathe it in, and air-con systems create mist/droplets and blow them around.
The 1998 water contamination in Sydney was cryptosporidium and giardia (https://en.wikipedia.org/wiki/1998_Sydney_water_crisis) which infect you when you drink the water.