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London’s Premium Water Filtration & Softening Specialists

Installed by experienced water filtration engineers with clean pipework, professional commissioning, and ongoing aftercare support. Fully insured, reliable, and built around long-term performance.

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✅ Fully Insured 🔧 Professional Installation 📍 London-Based Engineers 🛡️ Warranty Included ⭐ 5-Star Service

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Hard Water Is Damaging Your Home

London has some of the hardest water in the UK — here's what it's costing you.

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Taps & Showers

Limescale blocks flow

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Boilers & Cylinders

Scale cuts efficiency

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Appliances

Kettles & dishwashers suffer

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Skin & Hair

Dry, itchy & brittle

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Higher Bills

£600+ wasted yearly

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Glass & Surfaces

White stains won't wipe off

London's Best Water Filters, Supplied & Fitted

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Can You Drink Tap Water in London? | Borough Water Quality Checker
Updated April 2026 · Thames Water & DWI Data

Can You Drink
Tap Water in London?

Borough-by-borough breakdown of London's water quality — what's in it, what's safe, and what to do about it.

✓ Legally Safe
⚠ Very Hard Water
✕ Not the Cleanest
320
ppm TDS
London tap water average
500
ppm TDS
WHO safety limit
12
ppm TDS
After RO filtration
✓ Official verdict

Yes — London tap water is safe to drink. But "safe" ≠ "clean".

Thames Water treats London's tap water to meet strict UK Drinking Water Inspectorate (DWI) standards. You won't get sick from drinking it. However, London has some of the hardest water in the UK — with a TDS of ~320 ppm driven by its chalk and limestone geology. This means high calcium, magnesium, residual chlorine, and in older homes, traces of lead. Perfectly within legal limits. Not ideal to drink unfiltered.

Check your borough
💧
Borough Water Quality Checker
Select your London borough to see TDS, hardness & risk levels
—
Total Dissolved Solids (TDS)
—ppm
WHO limit
500 ppm
0 — pureAfter RO: ~12 ppmWHO: 500 ppm
Remove 96%+ of dissolved solids
RO systems installed across London · 48-hour turnaround
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Common questions
Yes — London tap water meets all UK Drinking Water Inspectorate (DWI) legal standards. Thames Water treats it with chlorine, UV, and filtration to kill bacteria and viruses. You won't get sick from drinking it. That said, "legally safe" and "genuinely clean" are different things. London water carries ~320 ppm of dissolved solids — calcium, magnesium, chlorine, and in older pipes, lead. A filter makes a noticeable difference in taste, scale, and peace of mind.
The taste comes from three main sources: residual chlorine used in treatment, high mineral content (calcium and magnesium from chalk aquifers), and occasionally organic compounds from Thames and Lee Valley reservoir sources. London's TDS of ~320 ppm is significantly higher than most bottled waters (50–150 ppm), which explains why filtered water tastes noticeably lighter.
Hard water contains high levels of calcium and magnesium. London sits on a chalk and limestone geology, and water picks up these minerals as it travels through the ground. With hardness levels typically above 300 mg/L CaCO₃, London ranks among the UK's hardest cities. The result: limescale on kettles, shower heads, boilers, and washing machines — costing households up to £200/year in energy and appliance damage.
Potentially, yes — in properties built before 1970. Lead service pipes were standard in Victorian and Edwardian construction. Thames Water is replacing them, but many homes still have internal lead pipes. The WHO advises there is no safe level of lead exposure for children. If your home is pre-1970, a certified lead-reducing RO filter is strongly recommended, especially if you have young children or are pregnant.
For London's specific water profile, a Reverse Osmosis (RO) system is the gold standard. It removes 96%+ of TDS — reducing 320 ppm down to around 12 ppm. This eliminates chlorine taste, hardness minerals, heavy metals including lead, and nitrates. Popular systems like the Waterdrop G3P600 and X12 can be installed under your sink. Brita jugs help with taste only — they don't remove lead or significant hardness.
An under-sink RO system typically costs between £270–£1,750 fully installed in London. Entry-level systems like the Waterdrop G2P600 start from £270. Premium systems with UV, remineralisation, and alkaline stages range up to £1,400. Compared to bottled water (average Londoner spends £300–£500/year), an RO system pays for itself within 12–18 months.

Data sourced from Thames Water quality reports & UK Drinking Water Inspectorate (DWI) · Last updated April 2026

Powered by London Water Filter · 21 Upper Hill, London SW2 2SD · +44 7960 036327

Waterdrop Reverse Osmosis System

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Years Of Experiences
About Us

Clean Water Starts with the Right Filter – Installed by Experts

At London water filter, we provide reliable and affordable water filter systems along with expert installation services — so your family always has access to clean, safe drinking water.

We offer three advanced types of water filters to suit every household:
Basic Water Filters, Reverse Osmosis (RO) Systems, and UV Water Purifiers — each designed to remove harmful contaminants and improve water quality at home.

  • Wide Range of Water Filters

Choose from Basic, RO, or UV filters — built for long-term performance and maximum water purification.

  • Expert Fitting Service

Our skilled technicians provide quick and professional installation to ensure your system works perfectly from day one.

  • Safe Drinking Water for Your Family

Our filters are designed to eliminate bacteria, chlorine, heavy metals, and impurities — delivering clean, mineral-rich water.

  • Fast Customer Support

Have a question or need filter maintenance? Our team is ready to help with reliable and timely service.

Water is life's matter. There is no life without water.

Why Choose Us

London #1 Water Filter Expert

Choosing the right water filter for home or whole house water filter system can transform your home’s water quality. At London water filter, we’re committed to delivering pure, safe drinking water through cutting-edge filtration solutions and expert services.

With years of experience, we help families enjoy healthier lives by offering advanced systems like the reverse osmosis water filter — one of the most effective ways to remove impurities, bacteria, and heavy metals from tap water.

Every filter is installed by certified technicians to guarantee performance, safety, and long-term reliability.

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Our Services

From water filter for house installation to domestic water filter systems maintenance — we handle it all.

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Client Testimonial

Trusted by Homes & Businesses Across London

We’ve earned the trust of customers all over London for delivering reliable, high-quality water filtration systems. Our local expertise, fast installations, and excellent customer service make us the top choice in the city.

Excellent service from start to finish! I bought a filter from London Water Filter, had it installed the next day, and when I needed a quick repair, they came out the same day. Truly dependable.

    Terrell Torres
    Terrell Torres

    The team at London Water Filter was amazing! They helped me choose the right filter, installed it quickly, and even followed up to check everything was running smoothly. Highly recommended!

      Melisa Hampton
      Melisa Hampton

      Since switching to London Water Filter, the water quality in our home has drastically improved. The team was professional, quick to install, and genuinely cared about our needs.

        Jardel Rayner
        Jardel Rayner

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