What a sewage treatment plant service should actually include
A proper service covers the mechanical parts and the biological process, not just a look in the lid. What should happen, and what the report should say.
Read the guideAn alarm usually means a failed pump, a stuck float or a rising level. What to check, what to stop doing, and how urgent it really is.
Treat it as urgent but not a panic. Check that the plant still has power and is still running, reduce water use in the house, and look at the level in the chamber. Do not simply silence the alarm and carry on — on most plants it means a pump has failed, a float is stuck, or the level is rising with nowhere to go.
Most domestic plants have a single alarm covering more than one fault, which is why the beep on its own does not tell you much. In practice it is nearly always one of four things:
The common thread is that something that should be moving has stopped. Nothing on that list fixes itself.
Look at the consumer unit for a tripped breaker or RCD, and at any local isolator near the plant. If a breaker has tripped, you can reset it once. If it trips again straight away, stop — something is faulty and repeatedly resetting it is both pointless and unsafe.
Stand next to the plant. A working blower hums steadily; a rotating plant turns slowly and audibly. Silence from a plant that normally makes noise is a clear finding and worth reporting when you call.
Lift the lid carefully and look. If the liquid is up near the inlet, the plant is backing up. If it looks normal, the alarm may be a float or sensor fault rather than a genuine high level — but that still needs attention, because a failed float means you have lost your early warning.
If you can see where the treated effluent leaves, check whether anything is coming out. Nothing leaving a plant that is otherwise running usually points at a blocked outfall or a drainage field that has stopped accepting liquid.
While the alarm is active, cut water use to the minimum. No baths, no washing machine, no dishwasher. Everything you put in has to go somewhere, and on a plant that cannot discharge it will find the lowest opening — usually a ground floor shower or an outside gully.
And do not just mute it. The mute button is there so you can sleep, not so you can forget. A silenced alarm on a plant that is still faulty is how a nuisance becomes sewage in the garden.
More urgent than most people assume. A plant that has lost its air supply starts losing its bacterial population within hours. After a day or two the biology is badly depleted, and even once the fault is fixed the plant can take weeks to recover its treatment performance — during which the discharge leaving it is well below the standard it is supposed to meet.
A high-level alarm is more immediately visible: the chamber fills, the house backs up, and you have a mess. Either way, a call on the day is far cheaper than a call at the weekend after it has overflowed.
Typically: confirm the fault the alarm is reporting, test the pump and floats in situ, check blower output rather than just whether it is noisy, inspect diffusers and filters, check the control panel and contactors, measure the sludge level, and look at the outfall. Faults divide fairly neatly into parts that can be swapped on the visit — diaphragms, floats, a pump, a contactor — and faults that point at the wider system, like a blocked outfall or a failed drainage field.
If the plant has been struggling for a while, expect a conversation about sludge. An over-sludged plant will keep alarming whatever you replace, because the working volume has gone.
We repair and service plants of all makes across Derbyshire, Sheffield, Nottinghamshire and Yorkshire, and we answer the phone 24 hours a day. If yours is alarming now, call 07884 111 641 and describe what it is doing — or read more about our servicing and repair work and what a service should include.
You can silence it so you can sleep, and you can reset a tripped breaker once. If it trips again immediately, leave it alone and call — something is faulty.
Normal toilet use, yes, sparingly. What to avoid is volume: baths, showers, washing machines and dishwashers all put a lot of water through at once, and that is what causes an overflow.
No. An intermittent alarm usually means a float that is sticking or a level that is rising and falling at the limit. It is the stage at which it is cheap to fix.
We take emergency call-outs 24/7 across the region. Tell us the make if you know it and what the plant is doing — running, silent, alarming, backing up — and we will bring the likely parts.
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A proper service covers the mechanical parts and the biological process, not just a look in the lid. What should happen, and what the report should say.
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