On properties not connected to municipal sewer systems, on-site sewage treatment systems must be installed. Regulations for the installation of septic systems in Queensland state that residential sewage systems may cater to only 20 adults, or equivalent. Industrial sites and large commercial farms need a commercial sewage treatment system to handle waste produced by the greater number of people on site. Sewage treatment can be done by experienced team in Queensland for both residential and commercial purposes. These regulations and requirements are set out in the guidelines for installing septic systems in Queensland.

These guidelines are in keeping with environmental protection laws and policies, which aim to protect the environment from untreated human waste. Each council has their own rules and regulations which must be adhered to, with regard to sewage treatment systems. Before installing a septic tank in Queensland, it is important to be informed of local council requirements, and to apply for the relevant permissions.

Those tasked with installing sewage treatment systems should also be aware of the guidelines pertaining to minimum distance from houses and waterways, including storm water drains and swimming pools. Also important to note is the slope of the ground surrounding the septic tank; care must be taken to ensure that the access hatch is above ground and accessible, and not subject to pooling rainwater, which may cause the system to overflow. Similar guidelines apply to commercial sewage treatment systems, with regard to their placement on the commercial property, and the uses of effluent.

Regular maintenance and testing should be carried out on all sewage treatment systems. This is usually done by the company which carried out the installation. Maintenance of electrical systems, such as fans, pumps, and heating, ensures that all parts of the system are working to treat the waste properly. In sewage treatment systems which use chemicals to break down and sterilise the waste, these chemicals must be kept in good supply. If they were to run low, the waste would not be properly treated.

The effluent, or water produced from the waste treatments, must adhere to strict standards in terms of sediment and chemical concentrations. These standards can be found in the state guidelines documents. The effluent must conform to standards, in order to be used for irrigation purposes on the property.
Irrigation may be carried out by drip lines, or by sprinklers, so it is important to ensure that people are not likely to be walking through the area while irrigation is in progress. This is because, despite the strict standards for effluent quality, it is still not considered fit for human consumption. Thus, it should not come into contact with skin, eyes, or lungs. In addition, ground mulch in the area to be irrigated must be adequate, to prevent run off of the effluent, or adverse environmental impact. It should also be ensured that the slope of the area being irrigated does not allow for effluent to run off into waterways, including swimming pools, ponds, and storm water drains.