Waste water from the kitchen (sinks and dishwashers), laundry (washing machines, troughs) or bathroom (showers, baths and hand basins) is called Greywater. It can be reused to water your lawn or garden.
All municipal water that is supplied to households is of drinking water quality, yet only about 1% is actually used for drinking. The rest is used for washing (becoming greywater), flushing toilets (becoming blackwater) or used on the garden.
Currently, in Tasmania, council regulations state that greywater must be treated (cleaned) before it can be re-used – on garden beds or for toilet flushing etc. This is because greywater (used water from laundries and bathrooms) contains traces of faecal matter and disease-causing pathogens.