Built with researchers at Imperial College
What's in your water?
Water companies test the grid, WaterGraph tests at your tap.
Fix issues that affect your family, skin, hair, gut, and longevity. An independent service with no commission from filter companies.
Bringing water health
into your life
We come from water. We’re made of water. And we consume it every day. Yet, we know so little about what comes out of our taps, and how it affects our health and wellness.
We offer the truth so that you know confidently about what’s coming out of your tap, and how you can change it to make it better for your family, hair, skin, gut, and longevity.
Giving you independent verification for what’s good for you, by filling up two bottles and posting them back to us.
How it works
Order your test kit
Arrives in one working day. Everything you need in one small box.
Fill two bottles and post them back
Takes five minutes, comes with a prepaid return envelope – post via any letterbox.
Results in 24 hours after your sample arrives at our lab
Get your Water Health Score and Care Plan, detailing what’s wrong and how to fix it.
Testing kits
1 test
- Results in 24 hours when we receive your sample at our lab
- Your results shared in plain English
- A Care Plan with independent fix recommendations
- A Water Health Score for your home
- Support from our team
- Free outbound and inbound P&P
2 tests
- Everything you get in our 1 test option
- Compare two taps. Or your water with and without your filter.
4 tests
- Everything you get in our 2 tests option
- Our best price. Test taps across the whole home.
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Our customers
Know what your children are drinking
We check what matters most to them – lead from old pipes, nitrates, too much copper or iron – and tell you plainly if anything needs fixing, and how to fix it.
David, 38 years old, London
“I’d never thought about it until now… they’re always drinking from the kitchen tap, and before you guys I had no idea what was coming out of it… especially for the baby’s bottle.”
Every reading in plain English.
Exactly how to improve your water’s health, based on what you’re interested in, and what not to waste money on.
Water working for your body
Hardness, copper, iron, and pH all shape how water reacts with your skin, hair and gut.
Sarah, 29 years old, London
“Before I got the right filter, the only relief for my skin and hair was going to another country! Never knew that knowing what was in the water could help me make the right decision to get my confidence back.”
Results for what’s really coming out of it, not the area average, and your options to alleviate any issues.
Find out what makes sense for you, or if yours is working as intended.
Your missing health metric
You track your sleep, exercise, and diet. But the two litres you drink every day have never been tracked – no longer.
Kate, 44 years old, Hampshire
“I want to live a healthy and mobile life until I’m 95. I’ve started tracking my key metrics, but this was totally missing.”
One 0–100 number, built from 8 health indicators.
Test several taps in one order, and watch the numbers move as you fix things.
See how we score, line by line.
The science
What we test for
We test for the key indicators associated with water wellness and health:
HardnessWhat standard is our testing?
WaterGraph is a water screening service. We work hard to provide accurate results that help you make informed decisions about your health and wellness.
We regularly perform control tests to ensure that our accuracy remains high. Our processes have been built with researchers at Imperial College, London. We don’t certify water as safe for drinking, and we don’t offer a UKAS-accredited laboratory service.
How we recommend solutions and calculate the Water Health Score
The foundation of our company is to provide you with the truth. This is why we don’t take commission from filter companies when we give you recommendations.
These recommendations are based on your test results, personal wellness goals, the proven efficacy of available solutions (free and paid), customer service ratings of paid solutions, cost, and effort.
Our team
Formerly Managing Partner of CambridgeCultura, a Cambridge research and insights spinout accredited by the Crown Commercial Service, and a Cambridge-funded visiting specialist at UNESCO. He remains an Affiliated Lecturer at the University of Cambridge, where he took a double-first and the University’s highest MPhil mark.
Professor of Subsurface Hydrology at Imperial College London, specialising in subsurface water flow and contaminant transport – including the Chalk aquifers of Southern England. He works closely with the British Geological Survey and is Principal Investigator on the NERC-funded CAMELLIA project.
Nearly seven years advancing simulation tools and field instrumentation for water systems, combining low-cost sensor design with AI to tackle pollution and water security. His early-warning sensor research was highlighted by the American Geophysical Union. PhD in Fluid Mechanics at Durham, with postdoctoral research at Durham and Imperial.
WaterGraph is a product by Cambridge Lakehouse
What's in your water?
FAQs
How accurate is this, and what happens if you find a problem?
WaterGraph is a water screening service. We work hard to provide accurate results that help you make informed decisions about your health and wellness, and we regularly run control tests to keep our accuracy high. Our processes were built with researchers at Imperial College, London. We don’t certify water as safe for drinking, and we don’t offer a UKAS-accredited laboratory service. Where a reading points to a possible compliance issue, we tell you plainly and we always recommend an accredited lab test to confirm it.
How does testing work?
Order your kit and it arrives in one working day. Fill two bottles from your tap (about five minutes), post them back in the prepaid envelope, and your Water Health Score and Care Plan are ready 24 hours after your sample arrives at our lab.
What do you test for?
8 parameters chosen for water wellness and health: lead, nitrate, copper, iron, fluoride, pH, alkalinity and hardness.
What’s included?
The home test kit with postage both ways, analysis of 8 parameters, your Water Health Score, a personal Care Plan, local water alerts, and support from our team whenever you need it.
Can I test more than one tap?
Yes, and it’s one of the most useful things you can do. Each tap needs its own kit, so we sell them in twos and fours. Compare your kitchen against your bathroom, or the same tap with and without your filter, and everything arrives in one order.
How long do my results take?
24 hours after your sample arrives at our lab, typically two to three days door to door.
How do I collect my water sample?
Fill the two bottles from your tap following the instructions in the box. It takes about five minutes.
What if I already have a filter?
Then you’re our favourite kind of customer. The test tells you whether it’s actually working. Many customers test filtered and unfiltered water side by side, which is exactly what the 2-test kit is for.
Will my report tell me how to fix any issues?
Yes. Your Care Plan says what each issue is, exactly how to fix it, and what not to waste money on.
Do you take commission from filter companies or sell your own filters?
No and no. Recommendations come from your readings, your goals, and the proven efficacy of solutions, nothing else. That independence is the whole point.
Do you test for PFAS, bisphenols, microplastics, hormones, or forever chemicals?
Not in the current 8-parameter panel. We focus on the indicators with the strongest evidence for UK tap water. Expanded panels are on our roadmap, and customers hear first.
What is my Water Health Score used for?
It turns 8 readings into one 0–100 number you can track, compare, and improve. It’s the headline for your home’s water, and the baseline for measuring any fix you make.
What is my Care Plan?
A plain-English action list built from your results and your goals: what’s fine, what needs attention, and the exact next step for each, free actions first.
What if I’m a renter?
Most fixes are tap-level, such as jugs, fittings and filters, with no landlord required. And if something bigger turns up, your report is solid ground for that conversation.
Do you serve the whole of the UK?
Yes, everything happens by post, UK-wide.