By 2021 Australians using more water-efficient products can:

There are many things we can do in and around our homes to save water and ensure we utilise this precious and finite resource wisely. Most Victorian homes use an average of 400 litres of water every day. Around 30 per cent is used for household purposes and 20 per cent is flushed down the toilet.
Uniform water restrictions, stages 1-4, and Permanent Water Saving Measures are used throughout Victoria. The Melbourne region will remain on stage 3a restrictions until November 30.
Building and renovating is an ideal time to make your home more water wise.
All new homes built in Victoria must comply with the 5 Star standard. The 5 Star standard requires:
From 1 May 2008, the 5 Star standard will be extended to cover house alterations. The changes will not require solar hot-water systems or rainwater tanks. You can also save significant amounts of water by installing water saving tapware and showerheads, rainwater tanks, stormwater systems or greywater systems (to divert wastewater to your garden or for toilet flushing). You should also consider water saving options when design your garden.
If you are planning to install water saving devices, always ensure you use a licensed plumber for any plumbing installations.
Whether you are choosing, designing or renovating your home, some simple improvements can improve the comfort of your home as well as help fight climate change. A water efficient house can be a key selling point when you choose to sell your home.
Around 50 per cent of the water you use is for household use. Saving water around the home can be achieved in many ways, including using water-efficient washing machines and dishwashers or installing a greywater system or a rainwater tank for toilet flushing or garden watering.
Saving water around the home is not only good for the environment, it can save you money. Government rebates are available on water saving products and systems.
The Department of Sustainability and Environment has recently released H2OME A guide to permanent water savings in your home, a comprehensive guide to incorporating permanent water saving measures throughout your home. The guide focuses on the options and choices that arise when building, buying or extending a home. It helps home owners understand how these choices can either potentially lock you into using more water than you need, or allow you to permanently and easily reduce your water use. It brings together information and advice about a wide range of water conservation and alternative supply measures in a simple and easy to read format, so you can develop the best package of measures for your circumstances. Download a copy of the guide for more information.
* Source www.waterrating.gov.au