Tap water hardness in Hessen
We have published hardness data for 73 cities in Hessen. The median is 10.7 °dH; the hardest water is in Limburg an der Lahn (23.3 °dH), the softest in Hofgeismar (3.1 °dH).
78 % of these cities have hard or very hard water (over 120 mg/L).
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Cities in Hessen, hardest first
| °dH | mg/L | ||
|---|---|---|---|
| Limburg an der Lahn | 23.3 | 416 | very hard |
| Rüsselsheim am Main | 22.4 | 400 | very hard |
| Hirschberg an der Bergstraße | 22.2 | 396 | very hard |
| Zwingenberg | 22.1 | 395 | very hard |
| Solms | 22 | 393 | very hard |
| Viernheim | 20 | 357 | very hard |
| Hofheim am Taunus | 19.7 | 352 | very hard |
| Darmstadt | 19.1 | 341 | very hard |
| Flörsheim am Main | 19 | 339 | very hard |
| Weiterstadt | 19 | 338 | very hard |
| Griesheim | 18.9 | 338 | very hard |
| Bensheim | 18.5 | 330 | very hard |
| Runkel | 18.4 | 328 | very hard |
| Walluf | 18.3 | 327 | very hard |
| Altenstadt | 18.2 | 325 | very hard |
| Biblis | 18.2 | 325 | very hard |
| Selters (Taunus) | 17.7 | 317 | very hard |
| Alsbach-Hähnlein | 17.7 | 315 | very hard |
| Bickenbach | 17.7 | 315 | very hard |
| Mühlheim am Main | 17 | 304 | very hard |
| Bad Soden am Taunus | 16.4 | 293 | very hard |
| Reinheim | 16 | 286 | very hard |
| Hanau | 15.9 | 284 | very hard |
| Eschborn | 15.6 | 278 | very hard |
| Bad Schwalbach | 13.1 | 234 | very hard |
| Mühlheim am Main | 13.1 | 234 | very hard |
| Mörfelden-Walldorf | 12.9 | 229 | very hard |
| Baunatal | 12.6 | 225 | very hard |
| Gudensberg | 12.5 | 223 | very hard |
| Frankfurt am Main | 12.2 | 218 | very hard |
| Ober-Mörlen | 12.2 | 218 | very hard |
| Pfungstadt | 12 | 214 | very hard |
| Offenbach am Main | 11.7 | 209 | very hard |
| Idstein | 11.6 | 207 | very hard |
| Bad Arolsen | 11 | 196 | very hard |
| Kassel | 10.9 | 195 | very hard |
| Ehringshausen | 10.7 | 191 | very hard |
| Reiskirchen | 10.7 | 190 | very hard |
| Wölfersheim | 10.6 | 190 | very hard |
| Bad Homburg vor der Höhe | 10.6 | 189 | very hard |
| Marburg | 10.5 | 187 | very hard |
| Taunusstein | 10.3 | 185 | very hard |
| Spangenberg | 10.1 | 181 | very hard |
| Nidda | 9.7 | 173 | hard |
| Geisenheim | 9.1 | 163 | hard |
| Gießen | 9.1 | 163 | hard |
| Gelnhausen | 9 | 161 | hard |
| Großkrotzenburg | 8.8 | 157 | hard |
| Schwalmstadt | 8.6 | 153 | hard |
| Friedrichsdorf | 8.5 | 152 | hard |
| Laubach | 8.5 | 152 | hard |
| Niederaula | 8.1 | 145 | hard |
| Lohfelden | 7.9 | 142 | hard |
| Mengerskirchen | 7.7 | 137 | hard |
| Bad Soden-Salmünster | 7 | 124 | hard |
| Neu-Anspach | 6.9 | 122 | hard |
| Reichelsheim (Odenwald) | 6.8 | 121 | hard |
| Eppstein | 6.7 | 120 | moderately hard |
| Usingen | 6.7 | 120 | moderately hard |
| Wehrheim | 6.6 | 119 | moderately hard |
| Stadtallendorf | 6.3 | 113 | moderately hard |
| Waldems | 6.2 | 110 | moderately hard |
| Grebenhain | 6.1 | 108 | moderately hard |
| Gedern | 5.3 | 95 | moderately hard |
| Niedernhausen | 5.2 | 94 | moderately hard |
| Oberursel (Taunus) | 5.2 | 93 | moderately hard |
| Wächtersbach | 5.1 | 92 | moderately hard |
| Schotten | 4.7 | 84 | moderately hard |
| Lützelbach | 4.4 | 79 | moderately hard |
| Glashütten | 4.3 | 77 | moderately hard |
| Trendelburg | 4.3 | 77 | moderately hard |
| Helsa | 4 | 71 | moderately hard |
| Hofgeismar | 3.1 | 55 | soft |