Drainage and septic tanks
A basement WC discharges through a pump and the pump was not run. What discharge has not been demonstrated?
The pumped discharge from the basement WC has not been demonstrated. The pan empties through a pump, and that pump was not run, so the survey has not shown that waste leaves the bowl, that the pump lifts, or that the rising pipe clears. What was recorded is the installation as seen. It is not a working test. A unit that sat quietly has not proved it will start when the WC is used. No drain test was carried out.
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 basement WC sits below a drain that can take a normal fall, so a pump, often in a small packaged unit, has to lift the waste. If it is not run, a seized pump, a stuck non-return valve or a blocked rising main all stay hidden. The surveyor can see the unit, the pipe and any stain already there. They cannot infer that the discharge works. Seeing the box is not the same as watching it pump, and this visit did not watch it.
Ask a drainage contractor to run the pump and to confirm where the rising pipe discharges. Tell the solicitor the basement WC is pumped and that the pump was not operated. Do not tell a lender the sanitary fittings were tested. If the unit is old, ask separately for any maintenance record. The home survey has not commissioned that check and it has not certified the discharge.
What should you ask your surveyor?
- Was the basement WC arranged to discharge through a pump?
- Was that pump left unrun, so no discharge was shown?
- Did you see the unit without testing the rising pipe?
What are the typical next steps?
- Treat the pumped WC as untested until the pump is run.
- Ask a drainage contractor to prove the discharge.
- Do not tell a lender the basement fittings were tested.
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 pan looks clean, has the pump worked recently?
A clean pan does not show that the pump lifts or that the rising pipe clears. The survey did not run the unit. Clean ware can sit above a seized pump. No drain test was carried out, so the discharge remains undemonstrated whatever the bowl looks like on the day.
Does a humming pump on a later visit rewrite this report?
No. A later visit by a contractor would be a new test, not a correction of this inspection. This survey did not run the pump. If someone later shows it working, that is fresh evidence. It does not mean the discharge had been demonstrated when the report was written.