In some cities, installation of rainwater tanks may be mandatory, or may help a new building be approved. For example, in Victoria, Australia new houses which have rainwater tank connected to all flush toilets are given an additional 1-star of the required 5-star House Energy Rating. Some governments subsidise purchases of rainwater tanks or provide rebates in areas where they are considered an important means of water supply augmentation.[3]
Rainwater to supplement drinking water supplies may be seen as an alternative to other water supply options, such as recycling or seawater desalination. Tanks are often perceived to have environmental costs that are comparatively lower than other water supply augmentation options. Where stormwater feeds natural creeks and streams, there are concerns about rainwater harvesting systems reducing the amount of run-off entering natural bodies of water.[citation needed]
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