Read the rebate conditions and information for rainwater tanks:

http://www.nrw.qld.gov.au/water/index.html

http://www.brisbane.qld.gov.au/BCC:BRISWATER::pc=PC_1460#3

http://www.ipswich.qld.gov.au/ipswichwater/residential/rebates

http://www.goldcoast.qld.gov.au/t_gcw.asp?PID=2439

http://www.ecodirectory.com.au