London has the largest number of homes with lead pipes anywhere in the UK, simply because of how much of the city was built before 1970. If your property falls into that category, the good news is straightforward: a reverse osmosis system removes 99%+ of dissolved lead from drinking water. That’s the direct answer. Everything below explains why, how to check if your home is at risk, and which filter actually does the job properly.
How much lead is actually in London water?
The water leaving Thames Water’s treatment works contains effectively no lead. The problem starts after that — in the pipes between the treatment works and your kitchen tap. London has a particularly old housing stock, and properties built before 1970 commonly used lead for the service pipe connecting the home to the street main, or lead solder on internal copper joints.
The UK’s legal limit for lead in drinking water is 10 micrograms per litre (µg/L), a standard that’s aligned with WHO guidance. But here’s the part most people miss: the World Health Organization has been clear that there is no known safe level of lead exposure, particularly for children and pregnant women. Meeting the legal limit isn’t the same as zero risk. A 2022 UK industry study found that roughly 23% of tested samples came from properties with lead pipework — a number that skews even higher in cities with older housing, London included.
How do I know if I have lead pipes?
Check where the water pipe enters your home, usually under the kitchen sink or near the stopcock. Two simple checks:
Look at the colour. Lead pipes are dull grey, not the orange-brown of copper.
Try the scratch test. Gently scratch the pipe with a coin. Lead reveals a shiny, soft silver surface underneath. Copper stays the same colour and feels harder.
Listen to the sound. Tap the pipe lightly. Lead gives a dull, muted thud. Copper rings clearly.
If your home was built before 1970, especially anywhere in inner London — Brixton, Hackney, Islington, Camden — there’s a realistic chance at least part of your supply pipe is original. If you’re unsure, we test for this as part of every installation we do.
Which filters actually remove lead — and which don’t
This is where most generic filter guides fall short. Not every type of water filter removes lead, and the difference matters.
Jug filters reduce some lead but performance varies hugely by brand and how fresh the cartridge is. Not reliable as your only line of defence.
Standard carbon filters (the kind built into many under-sink systems) reduce some lead but don’t remove it consistently. They’re built mainly for taste and chlorine, not heavy metals.
Reverse osmosis systems are the only domestic filtration method that consistently removes 99%+ of dissolved lead. The RO membrane has pores small enough (0.0001 microns on our systems) to block lead particles along with fluoride, PFAS, and other heavy metals, while still letting clean water through.
If lead is your specific concern, RO is not optional — it’s the only filter type proven to handle it properly.
The two RO systems we recommend for lead removal
Waterdrop G2P600 — £649 installed
A 7-stage tankless RO system that brings London’s water down from 320 ppm TDS to around 12 ppm, removing lead, fluoride, PFAS, and chlorine along the way. Two filters, simple maintenance, NSF/ANSI 58 and 372 certified. This is the system we install most often in pre-1970 London flats and houses where lead is the main concern and budget matters.
Waterdrop X12 — £1,899 installed
Built for households who want the most complete protection available. Same lead-removing 0.0001µm RO membrane as the G2P600, but with 11 stages of filtration, built-in UV sterilisation (kills bacteria and viruses too), and an alkaline mineral boost so the water doesn’t taste flat after filtering. The smart digital faucet shows real-time TDS readings so you can actually see the lead-related minerals dropping, not just take our word for it. We recommend this for families with young children or anyone in an older property where pipe condition is uncertain.
Both come with professional installation included, a 12-month labour warranty, and a written before-and-after water test so you have proof of what changed.
What we do differently
We TDS-test your water before installing anything and give you a written report — not just a sales pitch. If you’re renting, under-sink RO installation is a minor modification most landlords approve, and we’ve fitted these systems in plenty of London rental flats. We’re based in SW2 and cover all 32 boroughs with same-week appointments, using our own engineers — never subcontractors.
Frequently asked questions
Does a water filter really remove lead from tap water?
Yes, but only reverse osmosis systems do it reliably — removing 99%+ of dissolved lead. Standard jug or carbon filters reduce some lead but performance is inconsistent.
How do I know if my London home has lead pipes?
Check the pipe under your kitchen sink or near the stopcock. Lead is dull grey, scratches to reveal shiny silver underneath, and sounds dull when tapped — unlike copper, which rings clearly. Homes built before 1970 are most at risk.
Is London tap water safe if I have lead pipes?
It meets the UK’s legal limit of 10 µg/L, but the WHO states there’s no truly safe level of lead exposure. If you have lead pipes, especially with young children or during pregnancy in the household, filtering at the point of use is the practical solution.
Can I install a lead-removing filter in a rented flat?
Yes. Under-sink RO systems require one small hole for the dedicated tap, a minor change most landlords approve. We’ve installed these across many rental properties in London.
How long does installation take?
Most RO installations take two to three hours. We test your water before and after, and you get a written report showing the difference.
Worried about lead in your London home?
We test your water and install RO systems that remove 99%+ of dissolved lead, fitted by our own engineers across all London boroughs. Book water test or call 07960 036327.
