Lead pipes were standard in UK homes built before 1970. If you have them, your tap water may carry elevated lead — a potent neurotoxin. Enter your postcode to see your zone's measured lead level.
Free · Instant · No sign-up
The WHO states there is no threshold below which lead is proven harmless. Children under six and pregnant women are at greatest risk. If your home has lead pipes, take action now — see the steps below.
Lead pipes were standard issue in UK homes until the 1970s, when copper and plastic (polyethylene) gradually replaced them. If your property was built before 1970 and has never had its plumbing substantially replaced, there is a meaningful chance some lead pipework remains — particularly the supply pipe running from the street main to your stop tap, and possibly the internal distribution pipework.
Common locations for lead pipes: the rising main inside your property (the vertical pipe from the stop tap), pipes under the kitchen sink, and older ball-valve supply pipes to cisterns. If your home has been extended or partially replumbed, some sections may have been replaced with copper while others remain lead.
Lead is a cumulative neurotoxin — it builds up in the body over time, stored primarily in bones. There is no metabolic use for lead; all ingested lead is harmful. The mechanisms of toxicity are well understood: lead interferes with haem synthesis, disrupts calcium signalling in nerve cells, and competes with zinc and iron in enzymatic processes.
The supply pipe serving your property is split at the property boundary. The section from the water main to the boundary — the communication pipe — is the water company's responsibility. Under the Water Industry Act 1991 and subsequent amendments, water companies are required to replace lead communication pipes when they are identified, and must do so within a specified period when lead levels in a zone exceed statutory thresholds.
The section from the boundary into your property — the supply pipe and internal plumbing — is the homeowner's responsibility. However, most water companies offer free or subsidised replacement of the internal supply pipe when they replace the external section, as a partial replacement leaves a significant remaining exposure source.
Only filters independently certified to NSF/ANSI Standard 53 (for health effects contaminant reduction) are proven to remove lead from drinking water. Standard activated carbon filters — including most basic filter jugs — do not reliably remove lead.
The most effective option is a reverse osmosis (RO) system, which removes 95–99% of dissolved lead along with nitrates, THMs, PFAS, and most other contaminants. RO systems are certified to both NSF/ANSI 53 and NSF/ANSI 58.
The easiest way is the scratch-and-colour test: unpainted lead pipes are dull grey and scratch to a bright, shiny silver. They are also soft — you can dent them with your thumbnail. A magnet will NOT stick to lead (unlike iron or steel pipes, which are magnetic). Lead pipes often feel heavier than plastic or copper pipes of the same diameter. If your home was built before 1970, there is a real chance your supply pipe or internal pipework contains lead. The only definitive way to confirm is a lead test on your drinking water — enter your postcode above to see your zone's measured lead levels.
Yes, at elevated levels. Lead is a potent neurotoxin with no safe lower threshold — any exposure contributes to cumulative body burden. Children under six and foetuses are most vulnerable: even low-level exposure is linked to reduced IQ, attention deficit, and developmental delays. In adults, elevated lead exposure is associated with hypertension and kidney damage. The UK legal limit is 10 µg/L (micrograms per litre), reduced from 25 µg/L in 2013. The WHO guideline is also 10 µg/L, but they note there is no proven safe level. Water companies are required to run lead monitoring programmes and replace their own lead communication pipes.
Lead supply pipes are divided into two sections at the property boundary. The section from the water main to your property boundary — the 'communication pipe' — is the water company's responsibility to replace, and they are required to do so under the Water Industry Act. The section inside your property boundary — the 'supply pipe' and internal plumbing — is your responsibility as the homeowner. Most water companies offer subsidised or free replacement schemes for the internal lead supply pipe when they replace the external section. Check your water company's website for their lead pipe replacement programme details.
Four practical steps: (1) Run the cold tap for 2–3 minutes first thing in the morning before using water for drinking or cooking — this flushes out water that has been sitting in contact with lead pipework overnight. (2) Always use cold water for drinking and cooking — hot water dissolves more lead. (3) Install a certified filter. (4) Contact your water company about their lead pipe replacement programme — replacement of the external communication pipe and the internal supply pipe will permanently resolve the issue. Filters treat the symptom; pipe replacement is the cure.
Only filters certified to NSF/ANSI Standard 53 for lead reduction are proven effective. This includes: (a) Reverse osmosis systems (typically 95–99% lead removal — the most effective option); (b) Solid carbon block filters certified to NSF/ANSI 53; (c) Some high-specification filter jugs with ion-exchange media. Standard activated carbon jug filters (including basic Brita models) do NOT reliably remove lead — check the specific model's certification. Reverse osmosis systems such as the Waterdrop G3 or A1 countertop unit are independently certified and effective.
Lead pipe risk is highest in cities with older Victorian and Edwardian housing stock. London, Birmingham, Glasgow, Liverpool, Manchester, Sheffield, and Bradford all have significant numbers of pre-1970 properties that may retain original lead supply pipes. The water company itself may have relatively low lead levels at the treatment works, but water standing in old lead pipes inside properties can carry elevated lead. This is why zone averages can mask individual property risk — if your home has lead pipes, your actual exposure may be higher than the zone mean. Check your postcode above for your zone's mean lead level and contact your water company for pipe assessment.
All city guides