Lead pipes and drinking water
The incoming pipe is plastic and a few joints inside look soldered. Why is solder on a joint not the same finding as a lead supply pipe?
Because solder on a joint is a different observation, it is not the same finding as a lead supply pipe. The incoming pipe here is plastic. A few joints that look soldered are joints, not a lead pipe running in from the main. The survey can note both: plastic incoming, soldered appearance on some joints. It has not analysed the solder, and it has not renamed the plastic as lead. If lead in the water is the worry, the Drinking Water Inspectorate says you can ask the water company to test the kitchen 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?
What it saw was plastic on the incoming pipe and joints that look soldered. That is not a finding that the supply pipe is lead. It is also not a certificate that the joints are free of any lead-bearing solder. The survey did not test the metal in the joint and did not test the water. Those two notes must stay apart.
Ask the surveyor to keep the sentences split, so a reader's eye does not turn 'soldered joints' into 'lead supply'. If you want the water checked, ask the water company to test the kitchen tap and tell them what was seen. Do not invent a concentration from the look of a joint. Do not let a plumber scrape a joint 'to see' as if that were the test. The plastic incoming pipe remains plastic in the note. The joints remain a separate, untested observation.
What should you ask your surveyor?
- Is the incoming pipe recorded as plastic, not as lead?
- Are the soldered-looking joints written as joints, not as the supply pipe?
- Did you test the solder or the water, or only look?
What are the typical next steps?
- Keep the plastic incoming pipe and the soldered joints as separate notes.
- Do not call the joints a lead supply pipe.
- Ask the water company to test the kitchen tap if lead is the worry.
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 solder looks dull, is the supply lead?
No. Colour on a joint does not convert a plastic incoming pipe into a lead supply. The two findings stay different and untested.
Does new plastic pipe prove every joint is fine?
No. The plastic incoming pipe is one finding only. Joints that look soldered are another, and the survey has not analysed them at all.