Knowing what you can legally do to your own septic system in NSW can save you money on small maintenance tasks, and keep you out of serious trouble on the ones that require a licence. The short answer: owners can do surface-level housekeeping and inspection, but anything that involves cutting into drainage lines, altering the tank, or transporting waste requires either a licensed plumber or a licensed liquid-waste operator. This guide sets out the boundary clearly, but treat it as general guidance rather than legal advice: check the relevant rules or speak to NSW Fair Trading plumbing and drainage licensing for your specific situation.
What owners are allowed to do themselves
NSW does not require a licence for ordinary owner-maintenance that does not involve modifying or opening the drainage system. In practice, that means:
Surface inspection and housekeeping:
- Walking the property to check for wet patches, odours or lush grass above trench lines
- Clearing vegetation and debris from around the tank lid access point (but not opening the tank)
- Checking that the AWTS alarm panel is illuminated and the pump cycle is operating normally
- Keeping records of service dates, council inspection reports and pump-out history
What to flush and what not to: Owner education is entirely DIY territory. Understanding what damages a septic system, including what never to flush or pour down the drain and keeping inappropriate solids out of the system, is the single most cost-effective thing an owner can do. No licence is needed to change household cleaning products or install an in-sink strainer.
Locating the tank: Owners can use existing as-installed drawings or a council diagram to locate the tank lid. Exposing the lid surround by hand digging, without opening the lid or touching any plumbing, is generally within owner scope.
Keeping service records: Logging pump-out dates, AWTS service visits and council inspection results is owner territory and is important for council compliance under NSW septic rules.
What must be done by a licensed plumber (NSW Fair Trading)
Under NSW plumbing and drainage legislation, any work on the drainage system of a building, including the on-site sewage components connected to it, must be carried out by a person who holds a plumbing or drainage licence issued by NSW Fair Trading. This covers:
- Installing a new septic tank or AWTS
- Replacing an existing tank (even like-for-like)
- Modifying or extending inlet or outlet pipes
- Installing, relocating or replacing absorption trenches
- Relining or jetting drainage pipes inside the system
- Installing or replacing inspection openings and inspection risers
- Any work that alters the layout or hydraulic capacity of the system
- Commissioning or decommissioning a tank (including crushing and filling an old tank)
The Section 68 approval process for new installs and major modifications also sits firmly in licensed-operator territory. A licensed plumber coordinates the approval application as part of the job.
If root intrusion has damaged a pipe, the jetting and any subsequent pipe repair or replacement is licensed plumber work.
What must be done by a licensed liquid-waste operator (EPA)
Transporting and disposing of liquid waste in NSW requires a separate EPA licence for the liquid-waste transport vehicle. This is why a homeowner cannot legally pump their own septic tank and cart the waste away: it is not a lack of equipment, it is a licensing requirement that protects waterways and public health.
Specifically, any person who pumps out a septic tank and removes the contents must hold:
- An EPA-licensed liquid-waste transport vehicle registration
- A transport approval to carry the relevant class of waste
Septic tank pump-outs use EPA-licensed operators and equipment, with waste disposed of at approved receiving facilities. The NSW EPA on-site sewage management provides detail on the regulatory framework for waste transport.
There is a related question many owners ask: can you pump your own tank with a rented machine? Our separate guide on that question covers the answer in full. The short version: pumping without a licensed vehicle and EPA permit is not legal, and the waste cannot be legally disposed of without the appropriate transport licence.
AWTS servicing accreditation as a separate category
An aerated wastewater treatment system (AWTS) sits in a third category beyond basic plumbing. Under NSW Health’s accreditation framework for sewage management facilities, AWTS units must be serviced by an accredited service agent, not just any licensed plumber.
The AWTS quarterly service schedule is a condition of the approval to operate, and service reports must be lodged with council after each visit. Only accredited agents can complete and sign off these reports. If an AWTS is serviced by a non-accredited person, the service report will not be accepted and council may issue a compliance notice.
Our aerated system servicing is carried out by accredited agents.
Insurance and liability if you DIY regulated work
Carrying out licensed plumbing work without a licence exposes the owner to several practical risks beyond any regulatory penalty:
Home insurance: Many home and contents policies include exclusions for damage arising from unlicensed plumbing or drainage work. If a pipe you connected or altered fails and causes sewage contamination of the house, your insurer may decline the claim.
Property sale: An unlicensed alteration to a septic system is an unapproved system modification. It may constitute a failure to disclose during conveyancing and can become a post-settlement issue if discovered.
Council enforcement: If council inspects and identifies unlicensed work, the owner can be required to remove and replace the work at their cost, using a licensed plumber, even if the work is technically functional.
Environment and health liability: If an unlicensed alteration causes effluent pooling or waterway contamination, the property owner bears the liability.
The table below summarises what falls into each category.
| Task | Who can do it | Licence type |
|---|---|---|
| Walk-around visual inspection | Owner | None required |
| Clearing debris from around lid | Owner | None required |
| Monitoring AWTS alarm panel | Owner | None required |
| Maintaining flush records | Owner | None required |
| Flushing domestic drains | Owner | None required |
| Opening tank for inspection | Licensed plumber | NSW Fair Trading plumbing |
| Installing or replacing tank | Licensed plumber | NSW Fair Trading plumbing |
| Modifying inlet/outlet pipes | Licensed plumber | NSW Fair Trading plumbing |
| Installing/replacing trenches | Licensed plumber | NSW Fair Trading plumbing |
| Jetting drainage pipes | Licensed plumber | NSW Fair Trading plumbing |
| Pumping out tank contents | Licensed liquid-waste operator | EPA liquid-waste transport |
| Transporting septic waste | Licensed liquid-waste operator | EPA liquid-waste transport |
| Servicing an AWTS | Accredited service agent | NSW Health AWTS accreditation |
| Lodging council AWTS report | Accredited service agent | NSW Health AWTS accreditation |
DIY vs licensed plumber FAQs
Can I install a septic tank on my own property in NSW?
No. Installing a septic tank or any on-site sewage system requires a licensed plumber and a Section 68 approval from your local council. This applies even on rural acreage blocks where the tank will not be connected to a public network.
What maintenance can I legally do without a plumber?
You can inspect the surface of the property for signs of system problems, maintain good flush habits, clear surface debris from around the tank lid access, and keep records. Everything involving opening the tank, modifying pipes or transporting waste requires a licence.
What happens if I pump my own tank?
Pumping without an EPA-licensed liquid-waste transport vehicle is an offence. Beyond the legal risk, the waste cannot be legally disposed of without a transport permit. The appropriate disposal facility will not accept waste from an unlicensed operator.
Is there anything special about AWTS compared to conventional septic for DIY?
Yes. AWTS units have an additional accreditation layer. Not only must any physical work be done by a licensed plumber, but the mandatory quarterly service can only be completed and reported to council by an NSW Health-accredited service agent. A regular plumber who is not accredited cannot sign off the council report.
If I want to plant trees on my acreage, do I need to consult a plumber about the septic?
Not for planting itself, but it is worth knowing where your system components are before you plant large trees. You can locate your tank and trench lines using council records or your as-installed diagrams (owner task), then apply appropriate planting setbacks. The tree root intrusion guide covers safe planting distances.