Servicing your septic or AWTS: what's actually required
Every on-site wastewater system comes with maintenance obligations — and for some systems they're written into law, not just the owner's manual. A conventional septic tank mostly needs a periodic pump-out and an annual look. An aerated wastewater treatment system (AWTS) needs a professional service roughly every three months, and in most states the service agent's report goes straight to your council. These guides cover what's required, how often, and what it costs to stay compliant.
| System | Routine servicing | Pump-out / desludge | Who checks up on you |
|---|---|---|---|
| Conventional septic | Owner check yearly; no mandatory contract in most states | Every 3–5 years typically | Council inspection programs (varies by LGA) |
| AWTS (aerated system) | Professional service, usually quarterly — mandatory | Every 3–5 years, on the agent's advice | Service agent reports to council in most states |
| Sand / media filter | Annual check typical; pumps and filters need attention | Septic tank component every 3–5 years | Council, per approval conditions |
| Composting toilet | Owner-managed emptying per manufacturer | Greywater system still needs its own care | Council, per approval conditions |
| State | Typical required interval | Service reports go to |
|---|---|---|
| NSW | Quarterly (accreditation + council approval to operate) | Council, lodged by the service agent |
| QLD | Usually quarterly (set in the chief executive approval) | Council, lodged by the service technician |
| VIC | Quarterly for AWTS (permit conditions) | Council, usually direct from the agent |
| SA | Per approval; regular professional maintenance | Council / approving authority after each service |
| WA | Quarterly for most ATUs | Local government (the controlling body) |
| TAS | Per certificate of accreditation, commonly 3–6 monthly | Owner keeps records; council can audit |
| NT / ACT | Per approval conditions; follow the manufacturer's schedule | Confirm with your council or health authority |
Servicing guides
AWTS servicing requirements
The mandatory quarterly service, state by state — who reports to council, and what happens if you skip it.
Pump-out frequency
How often to pump by tank size and household, and how to measure sludge and scum yourself.
Owner maintenance guide
What not to flush, which cleaning products matter, the additives myth, and protecting your trenches.
Service contracts
Choosing a service agent, what a proper report covers, and manufacturer vs independent agents.
Wondering what all this costs? See our servicing cost guide and pump-out cost guide. If your system is already showing trouble — smells, wet ground, slow drains — start with the problems guides instead, or find an accredited local through the directory.
Common questions
Is servicing legally required for a normal septic tank?
Generally no formal service contract is required for a conventional septic tank — but you're still legally responsible for keeping it working, and many councils run inspection programs. Pump-outs every 3–5 years are the practical minimum.
Why is AWTS servicing mandatory but septic servicing isn't?
An AWTS is a small mechanical treatment plant — blowers, pumps, disinfection. When those fail, partially treated effluent can be sprayed onto lawns, so regulators make professional servicing a condition of the system's approval.
Who is allowed to service my system?
For an AWTS, a licensed or accredited service technician — either the manufacturer's agent or an independent one, depending on your state and the system brand. Pump-outs must be done by a licensed liquid-waste contractor.
Need a service agent or a pump-out?
Tell us your postcode and system type — accredited local service agents and pump-out operators will call back with quotes.