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How much does a sewage treatment plant cost?

Installation and operating costs can vary significantly across the various on-site sewage treatment options. There are many factors which can affect the price of your system including soil type, property slope, setbacks to waterways, as well as setbacks to other buildings. All these points need to be considered when choosing and designing your sewage treatment plant.

We have put together a sewage system price guide to help customers get an idea of the installation and running costs involved in the different systems. 

Important note - all cost mentioned on this page are approximate and are to be used as a guide only. For an exact price please contact our team for a custom quote.

Septic system price

A septic system is a made up of a septic tank and a network of absorption trenches or baths.

Septic tanks are often one of the cheaper options to install and operate, however, they are dependent on factors such as your property having permeable soil, and don't treat the water to a quality where it can be used for surface irrigation (watering your garden). 

  • Cost to install a septic system - $7000 to $15,000

Running costs can be broken up depending on if the system is gravity-fed or requires a pump to move the water from your house into the tank.

  • Running costs for a gravity-fed septic system - $200 to $400 every 5 to 10 years
  • Running costs for a septic system with a pump - $760 - 1,520 every 5 to 10 years

For more information on the costs involved in installing and operating a septic system including a breakdown of running costs take a look at our complete price guide - Sewage System Price Guide

Looking for a Home Sewage Treatment Plant? Let our wastewater experts help you.

Aerated wastewater treatment system

An aerated wastewater treatment system uses an aerator to encourage the growth of the bacteria which helps to breakdown and clean the effluent. This style can offer a versatile, often cost effective, treatment option, however, requires a reliable power source and the mechanical parts pose a breakdown risk.

Installation costs vary depending on the method of treated water disbursement.

  • Cost to install an aerated wastewater treatment system surface disbursement - $7000 - $9000
  • Cost to install an aerated wastewater treatment system subsurface disbursement - $11,000 - $15,000

Running costs for a gravity-fed aerated wastewater system - approx $1000 per annum over a 15 year period.

For more information on the costs involved in installing and operating an aerated wastewater treatment system including a breakdown of running costs take a look at our complete price guide - Sewage System Price Guide

Sand filter wastewater system

A sand filter style wastewater system uses sand and the bacteria living in the sand to breakdown and filter the effluent. The treated wastewater is then distributed via absorption trenches and baths or fed to a second tank to be utilised for irrigation. This style is available is a large range of shapes and sizes which means it is a practical solution for a variety of different sized homes.

  • Cost to install a sand filter system - $11,000 to $22,000

Running costs for a sand filter system:

  • Enviro septic gravity or pumped - $200 to $400 every 5  to 10 years
  • Sand filter servicing (if model requires) - $500 per year

For further details on the price of a sand filter wastewater system as well as a breakdown of the operating costs visit our - Sewage System Price Guide

Sewage Systems |  HSTP Price Guide | Express Wastewater

Your local wastewater treatment specialists

Our team provide detailed customised quotes for every job as each block of land is unique and individual homes and businesses have differing wastewater requirements which can make one system ideal and another totally unsuitable. Speak to our team about your wastewater treatment requirements today.

How much does a sewage treatment plant cost? Let our experts help you.

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Why Use Express Wastewater Solutions?


    Because we are not a manufacturer and not tied to one particular system we can always offer the best solution for your wastewater needs.


    Because we do this every day we have developed a close knit expert team for every step of the process – from plans and council paperwork to excavations, electrical and plumbing. We handle it all to make the whole process as stress free and quick as possible.


    Most people have never installed a home sewerage treatment plant and don’t know the next step, that is why we offer a free 30 minute phone consult with one of our experts to point you in the right direction.


    We handle your wastewater installation from start to finish we can deal with all the trades, council everything so you don’t have to worry about a thing.


    Have peace of mind knowing that Express are licensed, insured professionals that will do your job right the first time.


    Not sure what system is right for you, or want to know if your system is working properly? Just give one of our friendly wastewater experts a call and they will be more than happy to help.


    We will always look to repair your system rather than replace it if it does not need to be, which will generally save large amounts of money sometimes up to and over $10,000.