Earth homes and how water can be saved in themJune 15, 2010
Preliminary research suggests that earth homes use about 270 litres of water per square foot of construction, about 1/4th of conventional brick mortar and RCC construction. Embodied water is thus much less in earth buildings.
Also these building harvest rainwater, recycle waste-water and have very little water footprint in their life cycle.
A good reason to build with earth.