Graywater in the Desert

This past fall, the city council of Tucson approved regulations requiring all new homes being built in the city after mid-2010 to include plumbing for a graywater system.  Graywater is the water that goes down the drains from your washing machine, bathroom sinks and showers and can be used for watering your vegetation or re-used for your toilet (instead of using drinking water to flush).  As most of the West Coast will see water shortages in the upcoming decades, I think this is a step in the right direction.  Reducing use and conservation are two key elements to protecting our most precious resource.