Water hardness by postcode in Germany
Enter your postcode: we match it to the nearest city with published hardness data and show its value, unit and source.
How the search works
Every postcode is matched to the nearest of the 809 cities in Germany for which a water supplier or regulator publishes hardness. Supply areas do not follow postcode boundaries, so the result is the figure of the nearest published supply. If the match is more than 15 km away we say so, and the annual water quality report of your own supplier is the better reference. Each city page names the source document and its date and, where the supplier publishes them, the values of each supply zone.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Regions
- Baden-Württemberg146 · 12.8 °dH
- Bayern137 · 15.8 °dH
- Brandenburg15 · 16 °dH
- Hessen73 · 10.7 °dH
- Mecklenburg-Vorpommern7 · 17.2 °dH
- Niedersachsen94 · 7 °dH
- Nordrhein-Westfalen153 · 11.3 °dH
- Rheinland-Pfalz25 · 9.9 °dH
- Saarland11 · 7.9 °dH
- Sachsen38 · 5.2 °dH
- Sachsen-Anhalt10 · 17.1 °dH
- Schleswig-Holstein26 · 12 °dH
- Thüringen8 · 16.5 °dH
Largest cities in Germany
| °dH | mg/L | ||
|---|---|---|---|
| Berlin | 18.4 | 328 | very hard |
| Hamburg | 11.7 | 209 | very hard |
| Munich | 15.8 | 282 | very hard |
| Cologne | 16.9 | 301 | very hard |
| Frankfurt am Main | 12.2 | 218 | very hard |
| Düsseldorf | 15 | 268 | very hard |
| Stuttgart | 11 | 196 | very hard |
| Dortmund | 7.7 | 137 | hard |
| Essen | 6.6 | 118 | moderately hard |
| Bremen | 7.7 | 138 | hard |
| Dresden | 7.7 | 137 | hard |
| Hannover | 12 | 214 | very hard |
| Nuremberg | 12.1 | 215 | very hard |
| Leipzig | 14.1 | 252 | very hard |
| Duisburg | 12.5 | 223 | very hard |
| Bochum | 7.5 | 133 | hard |
| Wuppertal | 5.5 | 98 | moderately hard |
| Bielefeld | 12.8 | 229 | very hard |
| Bonn | 5.6 | 99 | moderately hard |
| Mannheim | 20 | 357 | very hard |
| Münster | 13.8 | 246 | very hard |
| Karlsruhe | 18.4 | 329 | very hard |
| Augsburg | 13.2 | 236 | very hard |
| Mönchengladbach | 13.5 | 241 | very hard |
| Gelsenkirchen | 9.5 | 170 | hard |
| Aachen | 7.8 | 140 | hard |
| Braunschweig | 8.4 | 150 | hard |
| Kiel | 16.9 | 301 | very hard |
| Magdeburg | 14.3 | 255 | very hard |
| Freiburg im Breisgau | 4.9 | 88 | moderately hard |
| Krefeld | 13 | 232 | very hard |
| Mainz | 19.3 | 345 | very hard |
| Lübeck | 16.3 | 292 | very hard |
| Oberhausen | 10.8 | 192 | very hard |
| Kassel | 10.9 | 195 | very hard |
| Hagen | 7.2 | 129 | hard |
| Potsdam | 19 | 339 | very hard |
| Saarbrücken | 6.2 | 111 | moderately hard |
| Ludwigshafen am Rhein | 12.6 | 226 | very hard |
| Herne | 9.3 | 166 | hard |