Nearly two in five Queensland households have rainwater tanks, according to new ABS data (Qld Water and Energy Use and Conservation):

There were 628,900 households in Queensland in October 2009 with a rainwater tank at their dwelling. This represented 38% of all households in Queensland.

Clearly rainwater tank installations must have surged in response to rainwater tank rebates (now ceased) and water saving requirements for new houses which can be met using rainwater tanks.  In the late 1990s, only 18% of Queensland households had rainwater tanks (see Table 1 on p. 2 of Guidance on use of rainwater tanks).