Do I need council approval for a septic system?

The single most useful thing to know about on-site wastewater is who the decision maker is. People look for a state authority and find guidance rather than a permit, because in most of Australia the approving body is the local council. The state sets the framework and accredits or approves the equipment, and the council approves your particular system on your particular block.123

Victoria

EPA Victoria states that you need a permit from your local council to construct, install or alter an on-site wastewater management system, which includes a septic tank system. The application must include a valid certificate of conformity for the system, and the system has to meet council requirements under both the planning and the environment protection frameworks.1

Altering means changing the design or construction of the system, changing how it operates, or moving it to a different premises. General maintenance is explicitly not an alteration, so servicing your existing system does not need a fresh permit.1

Victoria also applies the general environmental duty to constructing, operating and maintaining the system, which means the obligation does not stop once the permit is issued. It continues for as long as you own the system.1

Queensland

Queensland needs local government approval, and for a treatment plant it also needs a treatment plant approval under the Plumbing and Drainage Act 2018. A septic only or primary system does not require that second approval. Business Queensland is direct about the consequence of skipping it: without approval the system cannot be installed in Queensland.2

Which department issues the treatment plant approval depends on size. Approvals for plants treating no more than 4.2 kilolitres of sewage a day come from the housing and public works department, and larger systems go to the environment department.2

New South Wales

In NSW the council approves the installation, and NSW Health accredits the equipment. NSW Health is explicit that accreditation of sewage management facilities is its only statutory role in on-site single domestic wastewater management, and that a council must not approve installing certain facilities unless the Ministry of Health has accredited them.3

Accreditation covers the vessel and the treatment system, including septic tanks, collection wells, aerated wastewater treatment systems, greywater treatment systems and composting toilets. It does not cover the drains connected to the facility or the land application area, which are assessed for your site rather than accredited in general.3

The conditions matter more than the permit

An approval is not a one-off piece of paper. It arrives with conditions, and those conditions are what set your servicing interval, what they require you to keep records of, and what the council can ask to see later. An aerated system generally carries a mandatory service contract written into the approval.21