How Much Does A Septic System Cost In Australia?

Septic tank systems are a popular choice for waste disposal in many parts of Australia. They effectively treat and dispose of human and organic waste so that it does not contaminate groundwater or surface water.

In this post, we’ll explore how much a septic system typically costs in Australia and the factors that affect this.

The exact cost of a septic tank system installation in your area will depend on a number of factors, including:

  • The size of the tank
  • The type of tank used
  • The cost of materials in your area
  • The distance between the tank and the house
  • Whether a leach field is required

The size of the tank

Septic tank systems come in a wide range of sizes. A small tank that holds 200 litres costs about $1.50 per litre, while a large tank that’s 500 litres costs about $1.30 per litre. Therefore, the larger the tank, the cheaper the cost per litre. Some tanks are made with concrete while others are made with polyethene. Concrete tanks are more expensive to install, but they have a longer lifespan.

The type of tank used

A septic tank system can be made from a variety of materials. These include:

  • Concrete
  • HDPE (High-Density Polyethylene)
  • Polyethylene
  • Plastic

Septic TankHDPE is the most popular material for septic tanks. It’s light and easy to install, and it’s cheap. It also has several advantages over other materials, including:

  • It doesn’t rust or corrode
  • It doesn’t absorb odours
  • It doesn’t crack and leak
  • It can withstand a large amount of pressure
  • It’s flexible and can bend without breaking
  • It’s light and easy to install

The cost of materials in your area

The cost of materials for a septic tank installation will depend on the cost of living in your area. Materials like concrete tend to cost more in areas where the cost of living is higher because they’re harder to source.

The distance between the tank and the house

Some tanks are buried close to the house, while others are buried further away. The cost of a septic tank installation will be lower if the tank is buried close to the house because it will be cheaper to lay pipes.

Whether a leach field is required

The cost of a septic tank installation is usually a one-off payment. This is because most septic tank systems are buried underground and do not need maintenance. An exception to this is in areas that are experiencing higher rainfall, which is when a leach field is required. A leach field is a system of perforated pipes that are installed in the ground to collect wastewater from the tank. This wastewater can then be used to water your garden. The average cost of a leach field is $1500 to $3000.

Eco Septic is a Sydney-based manufacturer that specialises in commercial wastewater systems and domestic treatment plants. We can provide fast and free quotes relevant to your commercial or domestic wastewater needs, all while keeping in mind individual spending capabilities. Our systems can help you dramatically reduce the wastewater levels produced by your household so that you have a clean conscience knowing you’ve done your bit in the face of the wastewater crisis.

For more information on how much wastewater a household produces, don’t hesitate to contact a member of our team at Eco Septic today.

Feel free to contact us on 1800 808 135 to discuss tank/system type, sizing and pricing or visit us at for more information.

We cover all Sydney suburbs as well as the regions of South Coast, Snowy Mountains, Southern Highlands, Riverina, Blue Mountains and Hawkesbury, Laguna, North and Mid North Coast, Bateman’s Bay, Nowra, Mallacoota, Narooma, Balmoral, Cobargo, Glenn Ines, Avondale, Glenmore, Mogo, Tarago, Torrumbarry, Albury, Faulconbridge, Maraylya, Sherbrooke, Strathdickie, Little Hartley, Linden, cattail,
Bowen Mountain, Murwillumbah, Kyogle, Bryon Bay, Lismore, Evan Heads, Yamba, Grafton, and surrounding areas.