Water / H20


Why use water that either travels long distances through a pipe from a community water arrangement, or comes from a well which requires large amounts of electricity, shrinks the aquifer supply and lowers the water levels of our planet?

Why have a middle person between our energy needs and the people? Our dwellings can be designed to have water by easily accessible means: rain and snow falling on the roof. The location of Earthship Village Colorado receives approximately 16.5” of water per year. This is twice the amount needed for a family of 4 if all of the water that hits the roof is drained, filtered and collected in cisterns for later use.


Each Earthship roof has a non-permeable surface to catch water and transfers it through a series of filters and into cisterns. Each cistern used is buried to protect it from the sun. The size is chosen based on the local climate of the area the Earthship is built. The water is gravity fed from the cistern into a Water Organizing Module, or WOM. The pump to this device pushes water into a pressure tank to obtain the correct water pressure. Filters are used to clean the water for both cleaning and consumption.

Hot Water

Water can be heated in two ways: by the sun and using natural gas. First the sun warms the water. If the water does not get warm enough, then natural gas will turn on. This type of water heating is known as “Gas on Demand”.

Hot Water Recirculation Panel

Earthships use a hot water recirculation panel. This panel features a water saving design that re-circulates the cold water in the hot water lines back into the cistern, allowing hot water to replace it.
The hot water recirculation system requires the plumbing to be completed during two separate stages: the rough-in and the electrical stage.

Each kit contains a hot water recirulating panel and the number of timer switches required for your dwelling.

The Path of Water

  • The Roof Water Catchment System channels water caught on the roofs through filters made from a silt mixture.
  • Water is gravity fed from the cisterns into the WOM.
  • Water is pushed into a pressure tank to obtain proper household water pressure.
  • A separate drainage system is used for toilets than for other plumbing fixtures.
  • Water is used for bathing or cleaning purposes.
  • Water is drained into interior gray water treatment and containment systems.