How to Install Underground Water Tank?

Underground water tanks in Sydney regulations focus on safety and quality in water harvesting and storage. All the procedures require legal clearances. Although some may view underground water tanks Sydney installation as a DIY project, it requires technical skills to avoid mistakes and accidents.

Requirements for Installing Underground Water Tanks

Installing an underground water tank in Sydney is a life-changing undertaking. It ensures adequate and safe water for domestic and commercial use. The following tips guide on how to go about the underground water tank installation in Sydney:

  • Available space

Some Australian authorities advocate for water tanks for new homes, but some homeowners seek to install theirs in existing homes. Both situations come with different considerations. The availability of space on the property guides the location for tank installation.

Standard underground water tanks suit properties with extensive land around them. These include traditional and robust steel and concrete tanks. For tight spaces and existing homes, collapsible water tanks work best.

Underground water tanks fit under the patio or deck or behind a garage. Innovations in water storage options now offer tanks that owners install under swimming pools. Some manufacturers advise building a deck above an old swimming pool and turning it into a water tank.

  • Type of the water tank

Owners with space construct concrete and steel tanks on the site. They also require space to hold the construction materials and manoeuvre construction machinery. An alternative for that is the collapsible inground water tank. These are like large water bags that have a supporting frame. They are assembled at the site, eliminating the challenge of moving a big water tank into a confined space.

  • Installation

Different tanks come with unique installation guidelines. Read the manual carefully to avoid mistakes that could damage the tank and void the warranty. Choose expert contractors for the task installation.

1. Preparation of the tank’s base

After choosing the site for the tank, ensure the tank will be close to a downpipe, is unobtrusive, and does not block access. Inground water tanks need a solid flat base to support their weight after filling. According to the manufacturer’s specifications, the base can be a concrete, timber, or steel platforms. A bed of sand is a temporary base

2. Install the tank’s water connections.

During the tank installation, add the tank’s water inlet, outlet, and holes for the overflow. Secure the pipes tightly to avoid leaks. Some of these pipes are permanent installations. Others are removable when moving the tank or during cleaning and maintenance.

Use Teflon tape as a sealant and precaution against leakage. If using a pump, a flexible pipe will be fitted between the tap and the tank to absorb the pump’s vibration, which could damage the tank.

3. Fit accessories

Underground water tanks use filtering devices to keep out debris during water collection. Another additional part is the flush diverter. These filters direct the initial rainwater that contains dirt and debris from gutters and the roof away from the tank. They later divert clean water to your tank.

Some water tanks need pumps to raise the water pressure. That will aid in distributing the water from the tank in case gravity does not provide adequate pressure. Some tanks come with internal pumps that do not need extra space.

4. Maintenance

Inground water tanks are low-maintenance installations. Their maintenance focuses on cleaning gutters and filters to protect the integrity of the collected water. Checking the tank’s parts regularly and replacing worn ones ensures the tank’s longevity. Flush out the sludge accumulated at the tank’s bottom during the occasional cleaning.


Underground water tanks support the storage of rainwater and recycled water. They help save costs, enhance the environment, and improve the value of a property. It all begins with choosing the right underground water tank and installing it correctly.

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