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water tanks underground

Water Tanks Underground


Our water tanks underground are manufactured to the guidelines of Australian Standard AS/NZS 4766:2006 – meaning when you buy our underground water tanks, you have peace of mind that you will not have to worry about manufacturing defects.

These underground water tanks are cheap and easy to install making them a perfect space-saving solution for your property.

We offer fast delivery throughout NSW, ACT, parts of VIC & South-East QLD.

Still not sure what you need? Simply contact us to discuss your underground tank water requirements and arrange a quote.

Why Buy An Underground Water Tank From Poly Water Tanks

  • Built to cure properly, no rush job production for a premium-grade finish.
  • Made from the best materials, UV-stabilised virgin food-grade polyethylene with no taste or smell (drinking-water compatible).
  • Small footprint design with no waste, giving the biggest storage capacity for its real estate.

Underground Water Tank Features


On occasion, it isn't practical to fit a water tank in the backyard or under the house due to lack of space, or perhaps a water tank doesn't fit in with the surrounding design. Whatever your reasons, the "Nugget" - a water tank underground that can be wholly buried in your backyard or under the driveway - or one of our round underground tanks are your perfect solution. With individual units available in 1250 and 1500 litre capacities, the "Nugget" underground water tanks can satisfy your water requirements from 1250 litres up to a maximum of 6000 litres by linking multiple individual units together. Alternatively, our 2000 and 3000 litre round underground water tanks have generous capacity with minimal excavation requirements.
As with all Poly Water Tanks, quality and durability are of utmost importance during the manufacturing process. The materials that we use are of premium quality and include UV stabilised virgin food grade polyethylene which leaves no taste or smell – this is drinking water compatible.
For best results when placing your water tanks underground, we recommend that you seek the advice of a consulting engineer for underground tank water system installation instructions specific to your particular scenario.

Advantages of Choosing Underground Water Tanks

Underground water tanks provide an excellent solution for properties with limited space or aesthetic considerations. These underground watertank systems can be completely buried, ensuring that they do not detract from the visual appeal of your landscape or take up valuable yard space. Whether you need an underground tank water system for residential or commercial use, our underground water storage tanks are designed to meet Australian standards, ensuring reliability and safety.

Additionally, the water tank underground installation helps maintain a cooler temperature for the stored water, reducing the risk of bacterial growth and maintaining water quality over time.

Moreover, underground water storage tanks offer superior protection from environmental elements and vandalism. Placing your water tank underground shields it from extreme weather conditions, potential damage, and unauthorised access, therefore prolonging the lifespan of the tank. Our range includes the versatile "Nugget" underground watertank, which can be linked to increase capacity up to 6000 litres, and our robust 2000 and 3000 litre round underground water tanks, requiring minimal excavation. Investing in an underground water storage tank not only optimises your water storage solution but also ensures a discreet and secure method of managing your water resources.