Your options if your septic system has failed
Finding out your off-mains system has failed can feel overwhelming. But with the right help, it's more manageable than you might think.
This guide explains what a failed system means, what your options look like, and what to do next.
Whatever your situation, we can help you put this behind you — and move forward with confidence.
How most homeowners find out their system has failed
There are several ways to learn your off-mains system has failed or is nearing end of life:
- a technician identified it during a service visit
- a solicitor or surveyor flagged it during a property transaction
- you discovered it after you moved into a new home
- you had suspicions and commissioned an inspection, which confirmed the problem
- you share a system with a neighbour and they alerted you
If any of these apply to you, you're in the right place.
What system failure actually means
A failed off-mains system may not look the way you expect.
At one end of the spectrum, failure is impossible to ignore — sewage backing up into your home or wastewater surfacing in your garden. At the other end, a system can appear to be functioning normally until an inspection reveals a serious problem.
Most failures fall somewhere in between. Whatever the severity, the underlying issue is the same: your system is no longer treating and dispersing wastewater as it should.
The most common cause of failure is the drainage field. Some drainage fields were never installed correctly in the first place — the wrong design, the wrong depth, or the wrong soil conditions from the start. Others have simply reached the end of their working life.
Tanks fail too, though less often. Even properly installed concrete and brick tanks corrode over time. In some cases, the structure collapses entirely.
A failed system needs attention right away
It's tempting to put off a problem like this, but a failed septic system doesn't wait. The longer it's unresolved, the more complex and expensive the solution becomes.
A failed system is also a health and environmental risk. Improperly treated wastewater in your garden can expose your family and pets to pathogens. If it reaches water sources, the harm extends even further.
There is a financial side too. If you sell your property, you must disclose a failed system to prospective buyers. By dealing with it now, you won't be forced to act — or lower your asking price — under the pressure of a sale.
The most common ways to resolve a failed system
When an off-mains system fails, the most pressing question is usually the same: what exactly needs doing to solve the problem?
The honest answer is that it depends. In some cases, targeted repairs can bring your system back to working order. But when your system has reached the end of its life, or when the failure is too extensive, replacement is the right call.
For most homeowners, there are three paths forward:
- Replace your drainage field
If your tank is in good condition, you may need only a new drainage field. This requires sufficient space and suitable soil on your property. If space is limited, connecting the Ecoflo compact biofilter to your existing tank can reduce the size of the drainage field you need. - Replace your tank
If your drainage field is sound but your tank is collapsed, corroded, or beyond repair, you may be able to replace it without disturbing the rest of the system. - Replace your entire system
When both your drainage field and tank have failed, or when site conditions make a partial replacement impractical, a full replacement is needed. What the new system looks like will depend on your site and its conditions.
To know which solution is best, you need a clear picture of your site. That's exactly what our free site assessment is for.
The Ecoflo biofilter can help you reduce the size of a new drainage field.
We'll give you straight answers
Our free site assessment is the first step to getting your system back on its feet. No jargon, no vague solutions — just experienced help from start to finish.
