Lead pipes and drinking water
A blue plastic main stops at an old lead tail before the stopcock. What piece of pipe is the remaining lead, and what water sample was not taken?
The remaining lead is the old tail, the short piece after the blue plastic main stops and before the stopcock. That is the lead the survey could see. The water sample that was not taken is any test of the water drawn from this house. Blue plastic upstream and a lead tail at the change of material are a visual sequence. They are not a laboratory result, and they are not a measurement of how the water sits against drinking-water guidance. The survey has named the tail. It has not sampled the tap.
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?
Blue medium-density pipe is the modern main people recognise by colour. Where it ends on an old lead tail, the renewal stopped short of the stopcock. The lead that remains is that tail, not a vague suspicion about every pipe in the house, and not a finding that no other lead exists out of sight. The surveyor should describe the junction they saw and stop. A water sample would be a separate act, done by whoever is competent to take it, and it was not done on this inspection.
Ask a plumber or the water company, as appropriate, about replacing the remaining lead tail, and ask what they need to see at that junction. If you also want the water checked, that is a sample at the tap, not a sentence added to the survey. Tell the solicitor the main is plastic up to an old lead tail. Do not drill or scrape the tail to confirm the metal.
What should you ask your surveyor?
- Where does the blue plastic stop, and where is the lead tail?
- Did you take any water sample, or only describe the pipes?
- Have you limited the remaining lead to the tail you could see?
What are the typical next steps?
- Call the remaining lead the old tail before the stopcock.
- Do not invent a water-sample result that was never taken.
- Ask about replacing that tail, and sample the water only as a separate step.
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 blue pipe is in the road, is the house then clear?
Not on that fact alone. Blue pipe up to the boundary, or up to the point the survey saw, still leaves the old lead tail before the stopcock. That tail is the remaining lead, and no water sample was taken.
Does a new stopcock mean the tail was replaced?
No. A new stopcock can be fitted onto an old tail. Unless the surveyor saw the lead gone, the tail is still the lead piece, and the water was still not sampled. The old lead tail is still there and unsampled.