This FACT indicates the percentage households in each state using rainwater tanks as a water source. The numbers have increased in recent years thanks to the state restrictions on mains water usage, plus new state laws which require all new dwellings, plus select extensions and renovations on dwellings, to install rainwater tanks for private use.
The measures are aimed at making dwellings more sustainable, and relieving pressure on mains water supplies. The data was collected from the Australian Bureau of Statistics in 2013. Statistics for the Australian Capital Territory and Northern Territory could not be obtained.