Septic Tanks

There are three main Septic Systems used in the Shoalhaven area:

  1. A.W.T.S or Supertreat System

  2. Pump Out System
    The pump out system is a two tank system where the household grey and blackwater flows into a septic tank. It is naturally churned over using a bafflewall and the liquids then overflow into the pump out tank. This tank will require a pump out from time to time, usually around 8 weeks for a fully occupied home.

  3. Site Disposal System
    The site disposal system is a one tank system attached to absorption trenches. The grey and black water runs into the septic tank through the bafflewall and the overflow liquid then goes into an absorption trench where it is dissolved into the ground.

Bennett's Concrete not only install septic tanks and systems but also can upgrade your existing absorption trenches to satisfy Council's regulations. We are also able to supply and install new concrete septic tank lids in a range of sizes to replace those old, broken and dangerous lids.


  • 2050 litre
  • 2550 litre (septic baffle)
  • 3400 litre (septic baffle)
  • 4850 litre squat (septic baffle)


  • 2050 litre
  • 2800 litre
  • 3550 litre
  • 4450 litre
  • 5150 litre squat
  • 10,000 litre

Product Specifications


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P.O.Box 214 NOWRA NSW 2541
phone: (02) 4422 3861 fax: (02) 4421 3861


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