Rain water tanks must be certified by Urban Rainwater Systems Pty Ltd in order to use the RW trade mark. Criteria include:
- Non asbestos or lead roofing materials
- Australian Standard complying gutters and downpipes
- Tank material complying with all Australian Standards
- An appropriate first flush device
- Adequate mosquito protection
- Take is sealed with covers and lids
- The system is labelled and advice that the rainwater tank is to be automatically or regularly desludged.