About Water Hardness Scale
An independent data resource dedicated to mapping and publishing verified municipal water hardness levels across Europe and beyond.
Our Mission
Hard water affects millions of households across Europe — shortening appliance lifespan, raising energy bills, and affecting skin and hair health. We believe everyone should have free, easy access to accurate local water hardness data. Our goal is to make that data understandable and actionable for homeowners, tenants, and businesses.
Our Data Methodology
All data is verified against European Environment Agency (EEA) publications and local municipal water board utility disclosures. We standardize regional measurements — German degrees (°dH), French degrees (°fH), and mmol/L — into a unified mg/L CaCO₃ format for consistent cross-border comparison.
Read the full methodology →Who We Are
Water Hardness Scale is maintained by a small independent team of researchers and developers with a background in data engineering and environmental science. We are not affiliated with any water utility, softener manufacturer, or chemical supplier. Our data and calculator outputs are objective and uninfluenced by commercial partnerships.
We fund the platform through affiliate partnerships and advertising — see our Affiliate Disclosure for full transparency. If you notice an error in our data, please submit a correction.
Independence & Transparency
- Data sourced exclusively from public municipal and EEA records
- No data is sold to third parties
- Affiliate commissions do not influence our hardness readings or recommendations
- Corrections submitted via our contact form are manually reviewed before updating the database