Drainage and septic tanks
A pumped rising main is said to join the public sewer at the lane. Was the connection seen, or only described?
Only described. The pumped rising main said to join the public sewer at the lane was not followed to that joint. The survey can note a pump, a chamber or a visible length of pipe. The connection in the lane, and the buried run between, were not seen. A seller's account is not a drainage test. This visit did not run the pump, dye the line or lift every cover up to the lane. The report records a description. It has not confirmed the connection.
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 rising main carries pumped waste where gravity will not serve. The joint that matters is where that private pipe meets the public sewer. It may lie in the road, the verge or a chamber that cannot be opened freely. From the house the survey may see the pump and hear the account. It cannot see a buried joint by standing at the gable. Described and seen are different findings. This connection is only described, and the drain was not tested.
Ask the solicitor for the drainage search, any adoption plan and any pump warranty that names the outfall. A sewer map, if one is supplied, is still not the same as watching the connection. The survey has not said the rising main is sound. If the route matters, a drains firm with proper access can survey the line. Do not tell a lender the lane connection was inspected. It was said to be there, and this visit did not prove the outfall.
What should you ask your surveyor?
- Which pump or chamber was actually visible, and which length was only described?
- Is there a plan in the pack that marks the outfall, or only a verbal account?
- Did the surveyor lift a cover and still not see the public connection?
What are the typical next steps?
- Treat the lane connection as unseen until a plan or a drainage survey shows it.
- Ask the solicitor for the sewer map and any private-pump agreement.
- Do not describe the rising main as tested when you write to a lender.
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
Does a dry chamber today prove the rising main reaches the public sewer?
No. A dry chamber shows that one chamber was not holding water during the visit. It does not trace the pipe to the lane or prove a joint on the public sewer. The survey did not test the drain. An empty pit and a seller's description can both be true while the connection stays unseen.
If the connection is real, who must maintain the private rising main?
The survey has not decided that. A private pumped run can remain private even where it discharges to a public sewer. Responsibility follows the legal status of the pipe, which is a question for the drainage search and the title. Your solicitor should read those papers. The report can only say the connection was described.