How can I tell whether my water pipes are lead?

An old pipe is a reason to check, not a diagnosis.

The answer in 2 lines. In England, homes built before 1970 may still have lead water pipes. Dull grey pipework with rounded, swollen joints is a clue, but appearance cannot tell you how much lead is in the water. Ask your water supplier about testing and replacement. Meanwhile, clear standing water from the cold kitchen tap before drinking or cooking. Mention babies, children or pregnancy when requesting advice. Replacement needs coordination because the supplier and property owner look after different sections of pipe.

The first steps

Look at accessible incoming pipework: photograph the pipe near the internal stop tap without disturbing it. Avoid opening sealed service ducts.
Ask for a lead investigation: explain what you found, whether pipework has recently been disturbed and whether children or a pregnant person live there.
Reduce exposure while waiting: clear water that has stood in the cold kitchen supply before using it for drinking or food preparation, following the supplier’s advice.

Stop: danger

Do not sand, cut or heat a suspected lead pipe: leave investigation and replacement to a qualified professional.
A supplier says the water is unsafe: follow its specific drinking-water instructions. Do not assume that running the tap makes an unsafe supply suitable.

Recognising possible lead pipework

The Drinking Water Inspectorate’s lead guide includes identification advice and a photograph of a typical joint. Compare those with your accessible incoming pipe. Grey plastic and other metals can be mistaken for lead, so send photographs rather than treating colour as proof.

Its guidance describes a gentle coin check with disposable gloves and precautions against dust. If you are unsure, leave the surface alone and ask a qualified plumber to identify it. New copper under the sink does not establish the material of the buried supply pipe.

Arrange testing and ask the right questions

Use Ofwat’s official contact directory to find the supplier shown on your water bill, then request advice about suspected lead at your address. Ask how sampling will be arranged and whether you need to leave the tap unused beforehand. Follow those instructions so the sample answers the intended question.

Request the result and next steps in writing. Ask which sections of pipe have been identified as lead, whether replacement assistance is available and how work on the supplier’s pipe will be coordinated with yours. A test result is evidence about the sampled water, not a full survey of concealed plumbing.

What not to do

Assuming clear water or a normal taste rules out lead.
Treating a general boil-water notice as advice for every kind of contamination: follow the instructions issued for your supply.
Arranging private replacement work before discussing the connection and public pipe with the supplier.
Assuming a property survey has checked every buried or concealed pipe unless its scope expressly says so.

Children, pregnancy and health concerns

Read UKHSA’s information for the public for exposure advice and when to seek medical help. Lead is particularly concerning for developing children. If you think someone has been exposed, contact their GP and explain the suspected source; do not wait for symptoms.

If the supply is declared unsafe and you prepare baby feeds, use the official infant-feeding guidance published in 2026. Follow its instructions for an alternative supply rather than improvising with bottled water.

Who arranges replacement?

The property owner normally looks after internal plumbing and the private supply pipe. The supplier looks after its communication pipe. Shared supplies need particular checking: ask for the responsibility boundary to be confirmed in writing.

If you rent, report suspected lead and test results to your landlord. Use GOV.UK’s repairs guidance to check water-installation duties and the route for unresolved problems. In a block, ask the landlord or building manager about communal pipework. Do not assume a test automatically determines who pays every associated cost.

Good to know

Flushing is an interim precaution; removing the source addresses the underlying problem.
This guide concerns England. Wales, Scotland and Northern Ireland have different housing rules and administrative arrangements.

Illustrative example: Daniel moves into an older house in Nottingham and spots a grey incoming pipe. He photographs it, requests a supplier investigation and asks his surveyor what was checked. He coordinates any private replacement with the supplier instead of replacing only the visible kitchen section.

A made-up story, for illustration.

Bobby

Sources, verification, confidence

Verified on 4 November 2026, for England. Confidence: high for the older-property indicator, testing route, exposure precautions and general division of pipe responsibilities; medium for visual identification and the allocation of costs in shared systems. No visual check replaces water testing and an assessment of the pipework.