Drainage and septic tanks
There is no emptying invoice for the tank. Why is that a paperwork gap and not a survey defect rating of the lid?
The missing emptying invoice is a paperwork gap, not a defect rating of the lid. There is no invoice for the tank in the pack, so you do not have a record of when it was last emptied. It does not turn an absent bill into a condition score for that cover. A cesspool holds sewage and is emptied. A septic tank and a treatment plant are different. The report has not rated the lid for lack of an invoice, and it has not decided which of those the tank is beyond what was seen.
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?
Paperwork tells you about maintenance history if the seller produces it. A lid tells you about the cover you could look at: cracked, buried, or sound in appearance. Those are different sentences and should stay different. The survey does not invent a rating system for missing receipts, and it should not be asked to. General binding rules for small sewage discharges are a regulatory subject. They are not a mark the survey has awarded to this cover, and this note does not invent distances or a pass against those rules.
Ask the solicitor to request emptying records, permits or service notes, and to describe the tank as the seller claims it. Compare that claim with what the survey actually saw. Do not let a tidy lid stand in for the missing invoice, and do not let the missing invoice condemn the lid. If you need the tank identified properly, that is a drainage specialist looking at the installation, not a reinterpretation of a cover the surveyor photographed.
What should you ask your surveyor?
- What did you see of the lid and the ground, as distinct from any invoice?
- Have you avoided turning the missing paperwork into a rating of the cover?
- Did you record the tank only as far as it could be seen, without reclassifying it from a bill?
What are the typical next steps?
- Ask the solicitor for emptying records as paperwork.
- Keep the lid description separate from the missing invoice.
- Do not treat a tidy cover as a service history.
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 lid is cracked, is that the same point as the missing invoice?
No. A cracked lid is something the survey could see and can describe as a cover. The missing invoice is still only a gap in the papers. One does not become the other, and the survey has not scored the cover for a missing bill.
Does a verbal promise of annual emptying fill the gap?
No. A spoken promise is not an invoice. The paperwork gap remains until records are produced, and the survey has still not rated the lid on the strength of that promise or treated it as an invoice. Ask for the paper itself.