How big does a septic tank soakaway need to be?

How big does a septic tank soakaway need to be?

The minimum size a soakaway should be constructed to is 30m. Pipes should be laid on a 300mm layer of shingle or medium of up to 50mm. The trenches must be filled 50mm above perforated pipe and covered with a membrane and then filled in with soil.

How does a septic tank and soakaway work?

A soakaway in simple terms is a hole in the ground filled with rocks. It will be set away from the septic tank, and wastewater is then released into it. That wastewater will diffuse through the rocks and slowly escape into the surrounding ground.

How far does a soakaway have to be from a boundary?

A soakaway must always be the first choice but must not be used: Within 5m of a building or road, 2.5m of a boundary or in an area of unstable land in ground where the water table reaches the bottom of the soakaway at any time of the year.

How deep should soakaway pipes be?

How deep should a soakaway be? The Perforated pipe should be laid at a minimum depth of 200mm and a maximum depth of 700mm. This enables aerobic contact between the effluent and the drainage stone and soil particles. This leads to aerobic digestion and effectively treats the effluent.

How deep should you dig a soakaway?

Dig a hole in your garden measuring about 300mm square and 300mm depth. Pour a bucket of at least 10 litres of water into that hole. If the water has soaked away within about two hours then soakaways should work very well.

How deep do I need to dig a soakaway?

A simpler approach is to excavate the trial pit to establish whether a soakaway is likely to work or not, rather than determine just how effectively it will actually work. For this, dig a hole at least 1.2 metres deep. Remember, any excavation deeper than 1.2m MUST be supported to eliminate risk of bank collapse.

Do all septic tanks need a soakaway?

A soakaway is not usually needed with a sewage treatment plant, but it is required with a septic tank. This is because the water released by a septic tank is primary treated effluent, meaning it has only gone through one stage of treatment.

How to build a proper septic tank?


  • Laser transit and grade pole
  • 4″ Sch. 40 PVC pipe (and fittings if needed)
  • 4″ ASTM D2729 perforated pipe
  • 4″ASTM D3034 pipe and fittings
  • 4″ Sch.
  • PVC primer and glue
  • Saw (either hand saw or cordless reciprocating saw)
  • Hammer drill and bits (to go through wall if necessary)
  • Hydraulic cement (to seal around pipe if going through wall)
  • How to find your septic system tank?

    Request the septic tank location information from your county Health Department. The Health Departments of counties throughout the U.S.

  • Get in touch with the contractor who built the house.
  • Ask your neighbors where their septic tanks are located.
  • Inquire with the house’s previous owners.
  • Ask local septic companies if they’ve pumped the tank before.
  • How effective is a septic tank?

    – Plastic septic tanks tend to have lower effluent levels, which may be discovered after a tank is opened for pumping. – If not installed properly, a plastic septic tank can “float” to the surface of the ground. – Because plastic is such a light-weight material, it can be damaged at installation. – Plastic septic tanks are not approved in all states.

    How do you build a septic tank system?

    Pound a stake into the ground so that the top of the stake is level with the bottoms of the 45-degree bends.

  • Tape a 1 in (2.5 cm) wide block to the end of a 4 ft (1.2 m) level.
  • Place another stake about 3 7⁄8 ft (1.2 m) down the trench from the first one.
  • Lay the end of the level without the block on the first stake and the block on the second.