How to Choose the Right Underground Water Tank

Underground water storage tanks have changed the face of water harvesting and preservation in Australia. These tanks do not occupy space, as they remain tucked safely below the ground. Many domestic and commercial real estate property owners find them a viable option when short on space on the property or if they need the space for other functions.

They store a lot of water without compromising on the utilisation of space. Since needs vary and underground tanks have different qualities, one needs guidance to opt for the ideal underground tank.

Types of Underground Water Tanks in Australia

An underground tank is a water reservoir with 10% of its volume concealed underground. When choosing the right tank, the following are some options for consideration.

1. The material used in making a tank determines its portability, durability, and ability to maintain the integrity of the water for a long time. Concrete underground tanks are fairly common and built on-site because the weight of their material makes portability impossible. The porosity of concrete means the tank requires sealing during its construction to prevent minerals from leaching into the stored water. Pre-cast concrete tanks serve well under back or front yards and driveways. These tanks remain popular for their durability and easy maintenance. When constructed and cured well, it can last over 40 years.

Fibreglass underground water tanks are composed of a combination of glass and resin, and the tanks come in different classes depending on the intended purpose of the tank. As an option for underground water storage, they resist corrosion and are cost-effective.

Their durability also arises from high tensile strength coupled with flexibility. They are portable, customisable, and are said to be over 10 times stronger than steel tanks. It is easy to reconfigure and repair them, making them an economical option for storing high amounts of water. Some tanks are made of steel, and others of plastic.

2. The water tank should have adequate water capacity to make the storage effort worthwhile. A reasonable capacity ranges between 5,000 and 10,000 litres.

3. When checking its construction, it is wise to note that tanks with seams or weak seams crack along the seam. To avert that, look for tanks manufactured with a rotational process with no seams.

4. Order the tank from a reputable supplier or brand which offers clear terms of guarantee, installation, and after-sales support.

5. Consult experts to know the tank size you want to invest in. The walls should have sufficient robustness to withstand pressure from the soil around it without collapsing or splitting.

6. Considering that underground tanks serve other purposes, such as fuel storage or use as a septic tank, all tanks should have colour-coding to distinguish the ones intended for water storage from those available for storing other commodities.

Enhance Water Efficiency with an Underground Water Tank


Choosing the right underground water tank alleviates many headaches caused by inadequate or inaccessible water storage. Improper water storage can cause leakages, contamination, or inadequate supply of water, especially during emergency periods. The tank’s durability is another factor in considering the best options for achieving water efficiency.