This FACT indicates the percentage of each capital city's population that have rain water tanks installed in their home. A rainwater tank is a container for storing captured water. In Australia, a country prone to drought drought, a rainwater tank can provide relief on the mains (or city's) water supplies, or supplement mains water usage for drinking water, irrigation agriculture, fire suppression, agricultural farming, chemical manufacturing, and food preparation, to name a few.
Water tanks are a viable solution to combating the ever increasing water problems Australia faces, and for this reason, many states now require that new dwellings, and some extensions to existing dwellings, include a rainwater tank in their plans. The state with the highest percentage of people with rainwater tanks from 2013 is in Brisbane at 47 percent, followed closely by Adelaide at 45 percent. The state with the lowest is Perth with 9 percent. (data for Canberra and Darwin could not be obtained.)