On-site sewerage treatment

On-site sewerage facilities (OSSF) 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

A site and soil evaluation must be undertaken as part of the process of obtaining Council approval for effluent disposal within a 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 the Plumbing and Drainage Act 2002, Queensland Plumbing and Wastewater Code, Council's development conditions and the Environmental Protection Act 1994 by submitting a Form 8 to Council.

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.

Request for concurrence agency

Under the Standard Plumbing and Drainage Regulations 2003, Private Building Certifiers are required to submit a concurrence agency referral to Council when they assess any domestic extension where the number of bedrooms increases in a dwelling where there is an OSSF. This is regardless of if the extensions involve plumbing work or not.

Council's role as a concurrence agency is to assess if the existing OSSF is able to cope with the extension to the dwelling.

Private Building Certifiers are to complete the Request for concurrence agency for on-site wastewater management application and pay the relevant fee.

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Greywater is waste water generated from baths, showers, washbasins and laundries, which can be diverted for use on lawns and gardens. The Department of Housing and Public Works has more information on its use and disposal.