Tap water hardness in Capital Region
We have published hardness data for 75 cities in Capital Region. The median is 18.8 °dH; the hardest water is in Dragør (24.7 °dH), the softest in Rønne (11.1 °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 Capital Region, hardest first
| °dH | mg/L | ||
|---|---|---|---|
| Dragør | 24.7 | 442 | very hard |
| Fløng | 23.7 | 424 | very hard |
| Hedehusene | 23.7 | 424 | very hard |
| Taastrup | 23.6 | 421 | very hard |
| Ølstykke | 22.5 | 402 | very hard |
| Albertslund | 22.4 | 400 | very hard |
| Brøndby Strand | 22.4 | 400 | very hard |
| Trørød | 22.3 | 398 | very hard |
| Stenløse | 21.9 | 392 | very hard |
| Søvang | 21.8 | 389 | very hard |
| Birkerød | 21.5 | 384 | very hard |
| Ishøj | 21.5 | 384 | very hard |
| Veksø | 21.4 | 382 | very hard |
| Holte | 21 | 376 | very hard |
| Rødovre | 21 | 375 | very hard |
| Vallensbæk | 20.9 | 374 | very hard |
| Smørumnedre | 20.9 | 373 | very hard |
| Virum | 20.3 | 362 | very hard |
| Ballerup | 20.2 | 361 | very hard |
| Skovlunde | 20.2 | 361 | very hard |
| Glostrup | 20.1 | 360 | very hard |
| Hvidovre | 20 | 357 | very hard |
| Tårnby | 19.8 | 354 | very hard |
| Buddinge | 19.6 | 350 | very hard |
| Charlottenlund | 19.6 | 350 | very hard |
| Herlev | 19.6 | 350 | very hard |
| Frederikssund | 19.5 | 348 | very hard |
| Måløv | 19.5 | 348 | very hard |
| Værløse | 19.5 | 348 | very hard |
| Hundested | 19.4 | 346 | very hard |
| Nexø | 19.4 | 346 | very hard |
| Lynge | 19.3 | 345 | very hard |
| Stavnsholt | 19.3 | 345 | very hard |
| Blovstrød | 19.1 | 342 | very hard |
| Frederiksværk | 19.1 | 341 | very hard |
| Hørsholm | 19 | 340 | very hard |
| Skodsborg | 18.9 | 338 | very hard |
| Farum | 18.8 | 336 | very hard |
| Svaneke | 18.8 | 336 | very hard |
| Helsinge | 18.4 | 328 | very hard |
| Kokkedal | 18.3 | 327 | very hard |
| Kongens Lyngby | 18.3 | 327 | very hard |
| Græsted | 18.2 | 325 | very hard |
| Skævinge | 18 | 321 | very hard |
| Jægerspris | 17.8 | 319 | very hard |
| Lillerød | 17.8 | 318 | very hard |
| Copenhagen | 17.6 | 314 | very hard |
| Ramløse | 17.4 | 311 | very hard |
| Tisvilde | 17.4 | 311 | very hard |
| Liseleje | 17.2 | 307 | very hard |
| Allerød | 17.1 | 305 | very hard |
| Allinge | 17 | 303 | very hard |
| Frederiksberg | 17 | 303 | very hard |
| Nivå | 16.9 | 303 | very hard |
| Ølsted | 16.9 | 302 | very hard |
| Ganløse | 16.7 | 298 | very hard |
| Brøndbyvester | 16.6 | 296 | very hard |
| Slangerup | 16.5 | 295 | very hard |
| Gilleleje | 16.2 | 289 | very hard |
| Kirke-Esbønderup | 15.8 | 282 | very hard |
| Skibby | 15.6 | 279 | very hard |
| Humlebæk | 15.6 | 278 | very hard |
| Hasle | 15.4 | 275 | very hard |
| Dronningmølle | 15.2 | 272 | very hard |
| Åkirkeby | 15.1 | 270 | very hard |
| Fredensborg | 15 | 268 | very hard |
| Kvistgård | 15 | 268 | very hard |
| Ålsgårde | 14.7 | 262 | very hard |
| Espergærde | 14.7 | 262 | very hard |
| Hellebæk | 14.7 | 262 | very hard |
| Helsingør | 14.7 | 262 | very hard |
| Karlebo | 14.7 | 262 | very hard |
| Nødebo | 14.7 | 262 | very hard |
| Hillerød | 14.6 | 261 | very hard |
| Rønne | 11.1 | 198 | very hard |