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Built with researchers at Imperial College London

WaterGraph Test

Know your water

A home water test kit, analysed in our lab. Test your tap water for 8 key things, including lead and nitrate, with free postage both ways. Your results come with a Water Health Score and a Care Plan.

£49

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Results within 3 working days of your sample reaching our lab

A row of terraced houses on a London street

Test

Your home

Attention

Nothing over UK health limits. However one reading needs attention.

Your tap's water on 14 October 2026. One reading to watch as the seasons change, and some wellness factors to know.

8 key things, tested in our lab

We test your tap water for lead, nitrate, copper, iron, fluoride, pH, alkalinity and hardness. Your results are checked against UK limits and explained in plain English.

  • Lead
  • Nitrate
  • Copper
  • Iron
  • Fluoride
  • pH
  • Alkalinity
  • Hardness

With WaterGraph Premium, you can test your tap water for PFAS (forever chemicals) too. About PFAS testing

More about what we test

Water testing FAQs

Where can I get my tap water tested in the UK?

WaterGraph tests your tap water by post, anywhere in the UK: we send you a kit, you post your sample back, and we test your water in our lab. Your water company tests across your area, but only a test of your own tap shows what's coming out of it.

What's the best home water test kit in the UK?

Look for three things: a lab analysis rather than strips you read by eye, the readings that matter in UK homes such as lead and nitrate, and a company that doesn't sell filters. WaterGraph Test is analysed in our lab, covers 8 key things, and we don't sell water filters or take payment to recommend products.

How much does a water test cost in the UK?

WaterGraph Test is £49, with free postage both ways, your Water Health Score and a Care Plan. WaterGraph Guard is £59 a year for two tests six months apart, plus alerts all year if something goes wrong on your water network. WaterGraph Premium is £399: everything in Guard, plus a lab test for PFAS. It renews as Guard at £59 a year. Extra tests are £49 each on Test and £29 each on Guard and Premium.

How do I know if my water filter is working?

Test it. Pick two taps and label one filtered, or compare the same tap with and without your filter. Many customers test filtered and unfiltered water side by side.

All FAQs

How it works

  1. Order a test · Fill two bottles · Post them back

    Your kit arrives in one working day with a returnable prepaid box. Simply fill the bottles with the first water out of your tap and post it back free of charge.

    The WaterGraph test kit: a box and two sample bottles

  2. Results in 3 working days

    Within 3 working days of your sample reaching our lab, you get a summary of your results and a Care Plan, guiding you through any issues that might need fixing and how to fix them. Always in plain, jargon-free English.

    The Care Plan in a WaterGraph report, with Nitrate open: the reading set against the UK limit and the local average

  3. Your Water Health Score

    One number for your water, scored against UK limits and typical UK levels, with our method published.

More about how it works How we score

Example report

Your water health, in black and white

Every test comes with a report built around you: what we found at your tap, what it means, and what to do about it.

  • Every reading, explained
  • How to fix issues, step by step
How to read your report
An example WaterGraph report for Buckingham Palace, our demo address

Test, Guard or Premium?

Test

£49

One lab test of your tap

  • Results within 3 working days of your sample reaching our lab
  • A Care Plan: what to fix, and how
  • Free postage both ways
  • Extra tests £49 each
How many taps?

Guard

Best value

£59

Two tests six months apart, plus alerts all year

  • Everything in Test
  • A second test posted in six months
  • We watch your water network all year. We send you alerts if there's an issue
  • Extra tests £29 each
How many taps?

Renews yearly, cancel any time

Premium

£399

Guard plus a PFAS test

  • Everything in Guard
  • A lab test for 50 PFAS (forever chemicals)
  • Extra standard tests £29 each
How many taps? One tap only for PFAS

Then renews as Guard at £59 a year

Bought a Test? For 30 days after your results, your report offers Guard for £10, and your first test counts as the first of the two. You can upgrade to Premium any time by paying the difference.

We don't sell water filters or take payment to recommend products. We offer a screening test, not a certificate that your water is safe.

Built with researchers at Imperial College London. Rated Excellent on Trustpilot. Hundreds of customers making informed decisions about the water in their home.

Test your tap

A lab test of your tap water, your Water Health Score and a Care Plan, posted UK-wide. From £49.

Get a Test