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Readings submitted
Global community. Local water clarity.
Know what's in your tap water, made easy.
Submit a TDS reading, explore the UK map, or share your story — community data helps everyone drink smarter.
A growing community movement
Real readings. Real places. Real transparency.
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Locations covered
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Community average TDS
How we're helping
Making water quality visible together
Inspired by community map movements — built for UK drinking water and TDS transparency.
Raising awareness
Explain TDS in plain language so anyone can understand what their meter reading means.
Empowering communities
Anyone can submit readings, photos, and stories — reviewed before public discussions go live.
Map access for all
Search UK postcodes or click the map to see regional averages — no app install required.
Better daily choices
Track trends over time and decide when filtration or further testing might be worth it.
Recommended water purifier
Get cleaner water at home
Cut your TDS readings down to safe levels with a verified filter.
Shop nowGeographic Insights
UK Water Quality Heat Map
Search a UK address or postcode, or click the map — like a postcode finder. We show your area and local water quality (TDS).
Address
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Postcode
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Region
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Avg. TDS (area)
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Tip: click anywhere on the UK map to pick a location.
Live Data Stream
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Submit Water Reading
Your report helps map drinking water conditions for everyone.
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Water News Hub
Articles, global water news, and community stories — reviewed before publication.
Knowledge Base
What is TDS and why should you care?
Total Dissolved Solids (TDS) indicates how much dissolved material exists in water, including minerals, salts, metals, and micro-organic matter. It is measured in ppm.
TDS is not a full contamination test, but it is one of the fastest indicators to spot unusual water behavior and track quality trends over time.
How to measure quickly
Use a handheld TDS meter, dip into a clean sample, and record the displayed ppm reading immediately.
0-150 ppm
Ideal quality for most households. Usually clean-tasting and low mineral stress.
150-300 ppm
Acceptable range but monitor consistently, especially if taste or scaling changes.
300-500 ppm
Filtration is recommended. May indicate heavy dissolved content in your source water.
500+ ppm
Unsafe threshold for routine drinking in many standards. Use treatment and confirm lab testing.
Collaborate
Partner with us
Schools, councils, housing groups, and NGOs — help your community map local water quality and share trusted guidance.
Get in touch
Contact the How Clean Is My Water team
Want to collaborate, share research, or report a local water quality concern? Reach out and we will get back to you.
Email: hello@howcleanismywater.org
Support: support@howcleanismywater.org
Availability: Mon-Fri, 9:00 AM to 6:00 PM