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Underground Water Tanks

Underground water tanks are becoming more and more popular in major cities and urban areas with smaller blocks of land and more properties being crammed onto them, space is becoming a problem.

If you want a water tank but space is a problem why not consider an underground rainwater tank as an alternative. Underground water tanks are perfect for those urban situations where there is a need to install a water harvesting system, but there’s no room above ground to put it. They are also excellent for homeowners who don't like the appearance of an above ground water tank.

Precision Poly Water Tanks can address that situation, we supply a large range of underground water tanks in all shapes and sizes including Slimline Underground Water Tanks, Round underground rainwater tank and square underground water tanks.

Precision Poly Water Tanks deliver the water tanks all over NSW, Brisbane and Melbourne. 


1250 litre round underground watertanks


  • Diameter 1260mm
  • Height 1140mm
2500 slim underground rainwater water tank


  • Width 1260mm
  • Length 2500mm
  • Height 1140mm
3000 litre underground watertank


  • Diameter 1960mm
  • Height 1400mm
3000 liter round underground watertank

3000 litre Underground Watertank with 600mm Riser (Adjustable)

  • Height 1400mm
  • Diameter 1960mm
  • Adjustable Riser 600mm maximum height
3750 litre slim underground tank
  • Width 1260mm
  • Length 3750mm
  • Height 1140mm
5000 litre square rainwater tank
  • Width 2500mm
  • Length 2500mm
  • Height 1140mm
tank 5000l underground water tank
  • Length 2890mm
  • Width 2300mm
  • Height 1320mm

Height including Riser 1550mm

Diameter 2500mm


Standard fittings:

  • 100mm PVC inlet.
  • 100mm PVC overflow.
  • 25mm poly pump outlet.
  • 20mm PVC electrical grommet.
  • 300mm inspection plate.

Precision Poly water Tanks specialise in rainwater harvesting and have years of experience in the industry. We supply round rainwater tanks, under deck tanks, slimline tanks and underground tanks which are all made from food grade polyethylene. Order Your Water Tank Today

Australian made & ownedCall for more information: 0408 917 884