Request Service Today

What are the common issues with on-site sewage facilities?

If you have an on-site sewage facility already installed on your property, or you are needing to have one installed, it is important to be familiar with a range of information regarding them. This ensures the safety of you and those around you, as well as your neighbours and the greater community.

We have listed out some of the common issues that can arise with on-site sewage facilities, to ensure you are well prepared in advance. If you require further assistance in South East Queensland, give Express Wastewater a call 1300 722 517 and we can help.

What is an on-site sewerage facility?

According to the Sunshine Coast Regional Council, an on-site sewerage facility, otherwise known as an OSF, is 'any system that stores, treats and disposes of household wastewater on the property' and are a type of wastewater treatment system.

Who would have an OSF?

If your property is not connected to any public sewerage arrangement, you would have an OSF.

Need Assistance with OSF? Let our wastewater experts help you.

What are the different types of OSF?

There are a range of OSFs available including:

Common Issues with On-Site Sewerage Facilities

There are a few issues that commonly arise when it comes to OSFs, with problems usually being created by one or a combination of:

  • Lack of maintenance: This is an overarching aspect and can cause almost any of the below issues - that's why it is so important to keep on top of maintenance requirements!
  • Toxic chemicals in the system: If there are toxic chemicals going into the system, like solvents, oils, paints, disinfectant, pesticides, household cleaning products and bleaches, these products kill the helpful bacteria in an OSF. This causes the healthy bacteria to die and will reduce the digestion of organic matter, pollution in the absorption trenches and can cause the system to fail.
  • Too much sludge and scum in a septic tank: Not arranging for your septic tank to be desludged regularly can result in a failing tank and untreated effluent, with polluted wastewater flowing into the absorption trench.
  • Excessive water use: This can cause effluent to flow through a septic tank too quickly, which doesn't give the bacteria a chance to do their job. Additionally, solids can be pushed through the system which clog up absorption trenches.
  • Incorrect OSF design: Means a system is too big/too small to handle the load of a property, and it can cause a range of issues and lead to system failure.

Other issues include:

  • Overflowing land application area
  • Wastewater leaching into groundwater
  • Incorrect OSF has been chosen for your property
  • Unpleasant odours from the OSF
  • Blockages e.g. tree roots
  • Structural components of a system are damaged
  • Mechanical components of a system fail e.g. blowers and pumps
  • Failure to meet the relevant effluent quality standards

If you are having issues with your OSF, arrange a professional to attend your property ASAP to assess. Failure to do so can result in serious health issues for you, those around you and your local waterways.

Signs your OSF isn't working correctly

If you have one or more of the following occurring in your home, get a professional out as soon as you can to check your system:

  • The water isn't draining away properly in your sinks
  • Water is pooling around the disposal area
  • Your drain pipes are making gurgling sounds
  • There is an unpleasant smell coming from your drain or OSF
  • Water is backing up in your sinks

These are just a few of the most common signs - if you think something isn't right, call in a wastewater professional. They can check the system and find anything that needs addressing (hopefully) before it becomes a major issue.

Express Wastewater

If you would like further assistance with an OSF throughout Brisbane, the Sunshine Coast & Gold Coast areas, give Express Wastewater a call 1300 722 517 and we would be happy to help.


Sunshine Coast Council (Common failures of on-site sewage facilities):

Federation - NSW Government (Common Problems, Fact Sheets and Check Lists):

What are the common issues with on-site sewage facilities? Let our experts help you.

Not what you're looking for?

Try our search below for more information relating to septic, sewage and wastewater systems.

Search Help Section by Service

Search our information section by a specific service. Simply click the tile below.

Septic Tanks

Sewage Systems

Wastewater Treatment

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.