• Water is a precious resource, and having an underground tank ensures the availability of a fresh supply of potable water.close up of flowing water drops falling into water tank image by sasha from Fotolia.com
  
  Underground water tanks are useful as storage devices and could prove to be lifesaving in the event of a major disaster. The primary reason to own an underground water tank is to save on the cost of water. The tank can be used to collect rainwater and then serve as a water supply. This can save on high city water bills and ensure that you always have water. Some homeowners' insurance companies give significant discounts if you own an underground water tank.
  
  

Plastic

• A plastic underground water tank is lightweight, easy to handle and easy to install. Plastic water tanks present no health risks. Water can be kept fresh and uncontaminated for long periods. Plastic tanks are used in many countries where fresh water is scarce. In Africa, for instance, plastic tanks are used to store rainwater for drinking purposes. Other areas may use the stored water for agricultural needs such as irrigation or for watering livestock.
  
  

Concrete

• Precast or cast-in-place concrete is an exceptionally strong and durable material used for underground water tanks. Concrete tanks are built to withstand the gases and chemicals emitted from the soil. Underground concrete tanks work well where space is a concern. The ground can easily be excavated to accommodate these sturdy tanks, whose water capacity ranges from 7,000 liters (1,849 gallons) up to 10,000 liters (2,642 gallons). Concrete works especially well in fire-prone areas. If placed underground, there is minimal risk of damage from fire or environmental factors.
  
  

Fiberglas

• Underground water tanks made of Fiberglas are lightweight and versatile. They provide leak-free storage of water for all types of usage. They are durable and are not susceptible to corrosion or leakage. Fiberglas tanks are less expensive than steel or concrete. Installation is much simpler and less time-consuming. Fiberglas underground water tanks can safely store fresh water for short- or long-term use.
  
  

Steel

• Underground water tanks can be constructed of carbon steel, lined carbon steel or stainless steel. These steel tanks receive a corrosion resistant polyurethane coating. Steel tanks are considered safe and contamination-free for storing potable or non-potable water. They come in a variety of shapes and sizes for both commercial and residential use.