Tap water hardness in Zealand
We have published hardness data for 72 cities in Zealand. The median is 18 °dH; the hardest water is in Stege (26.7 °dH), the softest in Osted (12.9 °dH).
100 % of these cities have hard or very hard water (over 120 mg/L).
Danish waterworks report hardness in °dH; GEUS classes: soft < 8, medium hard 8–12, fairly hard 12–18, hard 18–30, very hard > 30 °dH. Most Danish tap water is groundwater and hard.
Cities in Zealand, hardest first
| °dH | mg/L | ||
|---|---|---|---|
| Stege | 26.7 | 477 | very hard |
| Søllested | 22.1 | 394 | very hard |
| Greve | 21.5 | 384 | very hard |
| Skælskør | 21 | 375 | very hard |
| Gundsømagle | 20.7 | 370 | very hard |
| Roskilde | 20.7 | 370 | very hard |
| Karise | 20.4 | 364 | very hard |
| Køge | 20.4 | 364 | very hard |
| Solrød | 20.3 | 362 | very hard |
| Sorø | 20.1 | 359 | very hard |
| Strøby Egede | 20 | 357 | very hard |
| Hårlev | 19.7 | 352 | very hard |
| Nakskov | 19.7 | 352 | very hard |
| Rødby | 19.7 | 352 | very hard |
| Rødbyhavn | 19.7 | 352 | very hard |
| Gørlev | 19.4 | 346 | very hard |
| Ejby | 19.3 | 345 | very hard |
| Gadstrup | 19.2 | 344 | very hard |
| Lille Skensved | 19.2 | 343 | very hard |
| Kalundborg | 19.1 | 342 | very hard |
| Rødvig | 19 | 339 | very hard |
| Sakskøbing | 19 | 339 | very hard |
| Væggerløse | 19 | 339 | very hard |
| Kirke Hvalsø | 18.9 | 337 | very hard |
| Nyråd | 18.9 | 337 | very hard |
| Vindinge | 18.9 | 337 | very hard |
| Vordingborg | 18.9 | 337 | very hard |
| Høng | 18.7 | 334 | very hard |
| Store Merløse | 18.6 | 332 | very hard |
| Bjæverskov | 18.4 | 328 | very hard |
| Holeby | 18.4 | 328 | very hard |
| Maribo | 18.3 | 328 | very hard |
| Idestrup | 18.2 | 325 | very hard |
| Tune | 18.2 | 325 | very hard |
| Gevninge | 18 | 321 | very hard |
| Nysted | 18 | 321 | very hard |
| Ruds-Vedby | 18 | 321 | very hard |
| Eskilstrup | 17.9 | 320 | very hard |
| Faxe | 17.9 | 320 | very hard |
| Ringsted | 17.7 | 316 | very hard |
| Alholm | 17.6 | 314 | very hard |
| Havdrup | 17.6 | 314 | very hard |
| Store Heddinge | 17.2 | 308 | very hard |
| Faxe Ladeplads | 17.2 | 307 | very hard |
| Nykøbing Sjælland | 17.2 | 307 | very hard |
| Stensved | 17.1 | 306 | very hard |
| Neder Vindinge | 16.9 | 303 | very hard |
| Ørslev | 16.8 | 300 | very hard |
| Forlev | 16.6 | 297 | very hard |
| Haslev | 16.4 | 293 | very hard |
| Jyllinge | 16.4 | 293 | very hard |
| Svebølle | 16.4 | 293 | very hard |
| Næstved | 16.3 | 292 | very hard |
| Rønnede | 16.3 | 291 | very hard |
| Stenlille | 16.3 | 291 | very hard |
| Vipperød | 16.2 | 289 | very hard |
| Slagelse | 16.1 | 287 | very hard |
| Asnæs | 15.6 | 278 | very hard |
| Nykøbing Falster | 15.6 | 278 | very hard |
| Sundby | 15.6 | 278 | very hard |
| Hørve | 15.5 | 278 | very hard |
| Stubbekøbing | 15.5 | 278 | very hard |
| Svinninge | 15.5 | 278 | very hard |
| Holbæk | 15.5 | 277 | very hard |
| Mørkøv | 15.5 | 277 | very hard |
| Fensmark | 15.4 | 275 | very hard |
| Korsør | 14.9 | 266 | very hard |
| Lejre | 13.6 | 243 | very hard |
| Svogerslev | 13.6 | 243 | very hard |
| Glumsø | 13.4 | 239 | very hard |
| Fuglebjerg | 13.2 | 236 | very hard |
| Osted | 12.9 | 230 | very hard |