Cistern

Some lots have no well and no pipe to a city water main. A house there cannot draw water on demand. Instead it keeps a reserve in a cistern, which is simply a large storage tank, and draws from that. A pump pushes water out of the tank and into the home's plumbing, the same way a well pump would. Cisterns sit buried or above grade. Desert ground is frost free, so burying one is straightforward. Residential sizes run from a few thousand gallons up to 10,000 gallons or more.

In the Phoenix metro, cisterns go hand in hand with hauled-water areas. Rio Verde Foothills is the well-known case. Many homes there have no well and no pipe to a utility. A truck fills the cistern on a schedule, and the household lives off that stored water until the next delivery. You size the tank to how much water you use and how often a truck can reach you. Bigger tanks mean fewer deliveries.

The choice matters beyond storage, because lenders care about it. A home that runs on hauled water into a cistern can be harder to finance. HUD's individual water systems guidance treats cistern and hauled-water supplies as a special case for FHA-insured loans. That is why buyers in these areas settle their financing path early.

Take a Rio Verde owner with no well. They might set a 10,000-gallon cistern in the ground and sign on with a water hauler. The real cost of that lot then includes both the tank and the delivery bills that follow it.

If you build where there is no well or main, treat the cistern as core infrastructure rather than an add-on. Size it for real use and delivery frequency. Plan the pump with your plumber. Then check how a stored-water supply affects your loan and your insurance.