Check Your Tap Water Quality
by Postcode
Free, instant, by postcode — hardness, nitrates, lead, PFAS and 30+ more parameters from every UK water company.
🔒 No sign-up · 📍 Any UK postcode · ✅ Official DWI data
Free, instant, by postcode — hardness, nitrates, lead, PFAS and 30+ more parameters from every UK water company.
Looking up your water zone…
We don't have data for that postcode yet. This could be because it's in an area we're still expanding coverage for, or it may be a Northern Ireland postcode (BT postcodes are not currently supported).
Help us improve — let us know your postcode and we'll prioritise adding it:
MyTapWater aggregates public water quality reports from all 21 UK water companies — over 1,327 supply zones — into one easy-to-understand report.
All data comes directly from official annual compliance reports submitted to the Drinking Water Inspectorate (DWI) and Scottish Water.
In-depth guides on water quality, safety, and common issues across the UK.
Water quality data, PFAS notices, and hardness levels for all 20 UK water companies.
Understand what's in your water and what to do about it.
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No thanks, continue with free summaryWhy we built this, where the data comes from, and what we believe about transparency in public water supply.
MyTapWater is a free public tool that makes UK water quality data accessible to everyone. Water companies publish detailed annual compliance reports — but they're dense, technical, and scattered across 21 different websites. We've aggregated all of it into a single, simple postcode lookup.
Enter your postcode and in seconds you'll know the hardness, nitrate levels, fluoride, lead, chlorine, and dozens of other parameters for your specific water zone — presented in plain English.
All data is sourced directly from official annual compliance reports published by UK water companies and submitted to the Drinking Water Inspectorate (DWI). The data covers the 2025 reporting year.
For enforcement and improvement programme data, we use the DWI's public register of active improvement programmes — 398 active notices across England and Wales as of March 2026.
Scottish Water data comes from their own public water quality reporting system, regulated by the Drinking Water Quality Regulator for Scotland (DWQR).
The water quality score (out of 100) is calculated from four weighted categories:
Important: All UK tap water legally meets safety standards. The score reflects overall quality and mineral balance relative to ideal ranges — not whether the water is safe to drink. UK tap water is safe to drink.
MyTapWater participates in the Amazon Associates programme and other affiliate programmes. When you click a product link and make a purchase, we may earn a small commission at no extra cost to you. This helps fund the ongoing maintenance of the site. Product recommendations are based solely on water quality data — we only recommend products relevant to your specific water profile.
Questions, feedback, or data corrections? Get in touch.
All data is published under the Open Government Licence v3.
Learn what's in your water, what it means for your home and health, and what you can do about it.
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Last updated: March 2026
MyTapWater (mytapwater.co.uk) is a UK-based website providing free water quality information. References to "we", "us" or "our" refer to the operators of mytapwater.co.uk.
We collect minimal data. Specifically:
We use a single cookie to remember your cookie consent preference. We do not use advertising cookies or tracking cookies. If you click affiliate links to Amazon or other retailers, those sites may set their own cookies in accordance with their own privacy policies.
MyTapWater participates in affiliate programmes including Amazon Associates. When you click a product link, we may earn a commission. Amazon's privacy policy applies to any interaction on their platform.
Under UK GDPR you have the right to access, correct, or delete any personal data we hold about you. To exercise these rights, contact us at hello@mytapwater.co.uk or via the contact page.
Contact form messages are retained for up to 12 months. Anonymised postcode district search logs are retained for up to 12 months and are used only for aggregate usage analysis.
We may update this policy from time to time. The date at the top of this page indicates when it was last revised.
Last updated: March 2026
MyTapWater provides water quality information for informational purposes only. By using this site you agree to these terms.
All water quality data is sourced from official annual compliance reports published by UK water companies and the Drinking Water Inspectorate. While we take care to ensure accuracy, we cannot guarantee the completeness or timeliness of the data. Always refer to your water company's official communications for the most current information.
Nothing on this site constitutes medical or health advice. All UK tap water meets legal safety standards. The water quality scores and ratings on this site reflect quality relative to ideal ranges — not safety. If you have specific health concerns related to water quality, please consult a qualified health professional.
Some links on this site are affiliate links. We may earn a commission if you make a purchase through these links, at no extra cost to you. Affiliate relationships do not influence our data or recommendations.
Full reports are sold through Lemon Squeezy, who acts as the Merchant of Record for all transactions. Lemon Squeezy handles payment processing and VAT collection. Their terms of service apply to all purchases. Contact hello@mytapwater.co.uk for any order queries.
The compilation, presentation, and scoring methodology of water quality data on this site is the intellectual property of mytapwater.co.uk. Underlying data remains the property of the respective water companies and the DWI.
We are not liable for any decisions made based on information provided on this site. Use of this site is entirely at your own risk.
These terms are governed by the laws of England and Wales.