On-site sewerage facilities are used for the treatment of domestic sewage on premises in unsewered areas.
An on-site sewerage facility is a facility on a premises for treating, storing and disposing of sewage generated on the premises. An on-site sewerage facility may include:
- an on-site sewage treatment plant, which uses mechanical, biological and filtration methods to treat waste before discharging through either above or below ground irrigation systems; or
- a septic system, which uses biological methods to treat waste before discharging through a below ground system.
An on-site sewerage facility does not include a dry-vault toilet that is not a chemical, composting or incinerating toilet.
To install an on-site sewage treatment facility, including a septic system or an on-site sewage treatment plant, you must first get approval from your local government.
In addition to local government approval, on-site sewage treatment plants must also have obtained chief executive approval or its equivalent (type specification or model approval) in accordance with Part 5 of the Plumbing and Drainage Act 2002.
A septic system does not require chief executive approval as it is not an on-site sewage treatment plant.
If the facility does not have the required approvals it cannot be installed in Queensland.
Chief executive approvals for on-site sewage treatment plants to treat sewage from fewer than 21 equivalent persons are issued by the Department of Housing and Public Works. Systems treating sewage from equal to or greater than 21 equivalent persons require a licence from the Department of Environment and Heritage Protection.
The Queensland Plumbing and Wastewater Code and AS1546.3:2001 (Joint Australian and New Zealand Standard), state the performance requirements and criteria used to assess on-site sewage treatment and greywater treatment facilities.
The department approves wastewater treatment systems to varying qualities such as:
The department provides a register of greywater diversion devices that have been approved by the WaterMark Certification Scheme.
View information about composting treatment systems.