Well, some parts of the country will move that way, slowly. Just the storage of gray water raises trememdous issues of public health, when you think of it in terms of a system on the premises of each home, with the homeowner having responsibility for safe maintenance and operation of the system. As far as the landscape, graywater cannot be distributed on the surface. Again, public health issue. There have been some systems put in for sub-surface distribution, but none has yet worked out the all the bugs. As far as I know, no system is commercially available at this time.