Septic Tank & Wastewater System Servicing Signs

15 May 2025 / Septic Tank Systems, Wastewater Treatment Systems

Signs Your Septic Tank and Wastewater Treatment System Needs Servicing

There’s a particular smell that can stop you mid-step, usually near the garden, especially after rain. Or maybe you’ve noticed drains gurgling oddly or water pooling where it shouldn’t. These little signs are often early warnings of bigger problems hidden underground.

Septic tanks and wastewater treatment systems are generally low-maintenance, but the consequences of skipping servicing are noticeable. Regular checks help you catch minor issues before they turn into costly repairs.

Unpleasant Odours: The First Warning Sign

Unusual smells around your garden, especially after rain, could mean your septic tank is full, clogged, or your wastewater treatment system isn’t working properly. When this happens, gases like hydrogen sulphide — the classic “rotten egg” smell — escape into the air.

It’s tempting to blame the weather, but persistent odours near your tank or irrigation area usually signal a problem. At BioSeptic, we often find early smells are ignored until tanks become overloaded, when a simple quarterly maintenance check could have fixed the issue quickly.

Bubbling Drains and Sluggish Water Flow

In a well-functioning system, water drains away quietly. Strange gurgling sounds or slow drainage from sinks and toilets usually point to a developing problem.

Bubbling drains and sluggish flow may suggest:

A partial blockage in the pipes leading to the tank.
An overfull septic tank struggling to process waste.
A malfunction inside the treatment system itself.

It’s easy to overlook slow drainage at first, but left unchecked, it can lead to wastewater backing up inside your home — something far more expensive (and unpleasant) to fix.

If your system hasn’t been serviced in over 12 months, now’s a good time. Call BioSeptic on 1300 658 111 or visit our website to book a check-up.

Pooling Water or Patches of Green

Another clear sign of trouble is pooling water around the septic tank, treatment area, or irrigation field. This often happens when the system becomes overwhelmed and untreated wastewater rises to the surface.

You might also notice that the grass above your tank or trenches suddenly looks much greener and grows faster than the surrounding lawn. While it might seem like a bonus at first, it usually means nutrients are escaping from your system, and that’s a health risk.

Health NSW warns that wastewater that isn’t properly treated or managed can carry significant health and environmental risks, especially when it enters the broader water system (Health NSW, 2023).

Unexplained Plumbing Issues

Sometimes, a septic or wastewater treatment system issue shows up through your plumbing. Frequent toilet clogs, sudden backups, or unpleasant smells coming from your drains could all be signs that your system is struggling.

These symptoms are easy to dismiss as isolated plumbing issues, but often, they trace back to problems in the tank or treatment system. A routine check could save you from much bigger headaches.

How Regular Servicing Protects Your System

Your septic system or aerated wastewater treatment system (AWTS) is a long-term investment in your property. Regular servicing protects that investment by identifying issues early, keeping the system running efficiently, and extending its lifespan.

The maintenance process usually involves:

Checking sludge levels in the tank.
Inspecting mechanical parts like pumps and blowers.
Ensuring the irrigation system is distributing treated water properly.
Testing water quality.

It’s far easier (and cheaper) to address a small problem during routine maintenance than to wait until a major failure occurs.

Know When to Call BioSeptic

If you’ve noticed any of these signs — smells, slow drains, pooling water, or plumbing issues — don’t wait. Septic and wastewater treatment systems rarely fix themselves. Problems often worsen over time, leading to higher repair bills and health risks.

At BioSeptic, we provide full servicing and repairs for all types of wastewater treatment systems and septic tanks.

If in doubt, contact our team. We’re ready to help you protect your home, your health, and your investment.