Best use of rainwater tanks
In Perth, we recommend water from rainwater tanks is best directed to non-drinking uses such as:
- irrigation of lawns and gardens
- external taps for gardens and car washing
- toilet flushing
- cold water laundry connections.
People connected to the public water supply system should use this water for drinking water. This is in line with the Australian Drinking Water Guidelines (2004) which state that above-ground rainwater tanks generally provide a safe supply of water. The guidelines recommend however, that for household drinking water supply, emphasis should be on selecting the best quality source water available.
Why rainwater tank water should be used inside and outside
Perth’s weather patterns of wet winters and dry summers result in rainwater tanks being full or close to full for much of the winter and empty or close to empty for most of the summer.
Using rainwater inside the home, as well as for outdoor uses ensures the tank is emptied on a regular basis, allowing it to fill up more times during the year (as opposed to just summer for garden watering).
Rainwater tanks aren't suitable for homes in much of the north of the state as houses don't have gutters due to heavy seasonal rainfall patterns.