07/04/2018
The typical water use per person in the US is about 80 gallons per day, the Earthship is designed to drop that use per day to approximately 20 gallons. With this lower water usage, Earthships are able to capture sufficient water from the roof to be self sufficient.
Water usage is reduced by using grey water for toilet flushing, low flow shower heads, low water use washing machines, hand dish washing, and by not using water for an evaporative cooler.