Onsite sewerage treatment and disposal

On-site sewerage facilities (OSSF) are used for the treatment and disposal of wastewater and domestic sewerage on properties in unsewered areas.

On-site sewerage facilities include different types of treatment and methods such as septic tanks with transpiration trenches, aerobic sand filtration systems with surface irrigation and aerated wastewater treatment systems with sub-surface irrigation.

The property owner is responsible for ensuring maintenance is carried out on their system. Council maintains an inspection program to ensure all on-site sewerage facilities are operating correctly.

Site and soil evaluator

One of the important aspects of an on-site wastewater management system is the requirement for a thorough site and soil evaluation to be undertaken as part of the process of obtaining Council approval for effluent disposal within the property. 

It is essential for the evaluator to select the most suitable on-site effluent disposal facility for the property and engage best environmental practices to support his or her design.

The quality of effluent from an OSSF is a key consideration to determine how sewage effluent is to be controlled and disposed of within the property. 

Before lodging an application to install, extend or remove an OSSF with Council, it is recommended that the property owner consult with a site and soil evaluator to discuss the options available for effluent disposal within the property.

Notice of compliance for on-site sewerage work

Following the installation of an OSSF, a site and soil evaluator shall inspect and certify the installation of the OSSF to ensure that it fully complies with thePlumbing and Drainage Act 2002, Queensland Plumbing and Wastewater Code, Council's development conditions and the Environmental Protection Act 1994 by submitting a Form 8 - see State Government plumbing forms.

Commissioning certificate

Following the installation of a wastewater treatment plant, the manufacturer of the plant is to certify that the facility conforms to design requirements and specifications and that such equipment has been installed and commissioned in accordance with manufacturer's instructions.


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