Arizona. 2/3 or more of residential areas have and use grey water. It is a requirement for new construction in most if not all of the counties. Almost all of th

Arizona. 2/3 or more of residential areas have and use grey water. It is a requirement for new construction in most if not all of the counties. Almost all of the water use you frequently see arizona criticized for, fountains, golf courses, etc, are all using grey water.