Australia and New Zealand both deal with hard water in their water supplies.
In Australia, states like South Australia, Western Australia, and parts of New South Wales are known to have areas with higher levels of hardness in the water. These regions often get their water from sources that naturally contain more minerals, making the water harder.
In New Zealand, areas like Canterbury and Otago on the South Island, as well as parts of Waikato and Northland on the North Island, tend to have harder water. These regions get their water from sources that naturally have higher mineral content.