Drainage and septic tanks
A small treatment plant has an alarm box and no power was on. What can the survey not say about how that plant treats sewage?
The treatment plant with an alarm box and no power on is a plant the survey cannot describe as treating sewage. The box was seen. The power was off, so no cycle was watched and no treatment was shown. The survey does not grant a discharge consent, and it does not swap this plant for a cesspit or a septic tank. What it can say is limited to the unit that was there and the fact it was not running.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
A small plant treats sewage only when it is powered and maintained. An alarm that cannot be observed, on a dead supply, tells you the controls were not demonstrated. It does not tell you the plant would pass or fail if the power were on. Smell, a high level or a missing outlet, if those were noted, stay separate observations.
Ask the solicitor for the service record, the discharge arrangements and whether the power is a simple isolation or a fault. None of that is created by the survey. Do not invent a distance from the plant to a watercourse or a boundary. Until the plant is seen working, the report should not say that it treats sewage.
What should you ask your surveyor?
- Was the power off at the plant, and did you see the alarm box only?
- Could you watch any treatment stage, or was the unit stopped?
- Are you avoiding any claim that the plant is treating sewage?
What are the typical next steps?
- Do not write that the plant treats sewage while it had no power.
- Ask for the service record and the discharge papers through the solicitor.
- Keep cesspit, septic tank and this plant as different words.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
If the alarm box looks new, is the plant working?
No. A box on the wall is not a running plant. With the power off, treatment was not seen and cannot be claimed from the visit.
Does the survey approve the discharge from this plant?
No. The survey does not grant a discharge consent, and it does not invent a distance or a standard the installation must meet.