From the article:
Graywater, the recycled water collected from your sink, shower or washing machine, is becoming increasingly popular with California’s building industry. By selling new homes with built-in systems for reusing water, developers may propel the practice into the mainstream.
An Australian company, Nexus eWater, is positioned to be a key part of the transition. The company’s home graywater recycling system is the only one that has passed a key certification permitting the water it cleans to be used in toilets and on lawns under California’s building code.