Water hardness in Slovakia
1113 cities with published hardness data, sorted by population. Median: 1.9 mmol/L.
Median
1.9 mmol/L
190 mg/L CaCO₃ · very hard
- 47 soft
- 283 moderately hard
- 209 hard
- 574 very hard
Slovak suppliers report "Vápnik a horčík" in mmol/L; the recommended range is 1.1–5 mmol/L.
Ranking of the hardest and softest water in Slovakia →
Regions
- Banská Bystrica Region327 · 1 mmol/L
- Bratislava Region61 · 2.13 mmol/L
- Košice Region300 · 1.28 mmol/L
- Prešov Region266 · 2.22 mmol/L
- Trenčín Region61 · 3 mmol/L
- Trnava Region98 · 3.7 mmol/L
Largest places, hardest first
Every place is listed on its region page.
| mmol/L | mg/L | ||
|---|---|---|---|
| Piešťany · Trnava Region | 6.4 | 641 | very hard |
| Holíč · Trnava Region | 4.3 | 430 | very hard |
| Skalica · Trnava Region | 4.27 | 427 | very hard |
| Sabinov · Prešov Region | 4.26 | 426 | very hard |
| Trnava · Trnava Region | 4 | 400 | very hard |
| Hlohovec · Trnava Region | 3.8 | 380 | very hard |
| Myjava · Trenčín Region | 3.63 | 363 | very hard |
| Malacky · Bratislava Region | 3.24 | 324 | very hard |
| Bardejov · Prešov Region | 3.23 | 323 | very hard |
| Banská Bystrica · Banská Bystrica Region | 3.15 | 315 | very hard |
| Stupava · Bratislava Region | 3.05 | 305 | very hard |
| Prešov · Prešov Region | 2.74 | 274 | very hard |
| Bratislava · Bratislava Region | 2.47 | 247 | very hard |
| Moldava nad Bodvou · Košice Region | 2.35 | 236 | very hard |
| Pezinok · Bratislava Region | 2.32 | 232 | very hard |
| Rožňava · Košice Region | 2.27 | 228 | very hard |
| Prievidza · Trenčín Region | 2.2 | 220 | very hard |
| Senec · Bratislava Region | 2.12 | 212 | very hard |
| Revúca · Banská Bystrica Region | 2.04 | 204 | very hard |
| Banská Štiavnica · Banská Bystrica Region | 1.85 | 185 | very hard |
| Stropkov · Prešov Region | 1.79 | 179 | hard |
| Brezno · Banská Bystrica Region | 1.6 | 160 | hard |
| Svidník · Prešov Region | 1.58 | 158 | hard |
| Zvolen · Banská Bystrica Region | 1.5 | 150 | hard |
| Humenné · Prešov Region | 1.24 | 124 | hard |
| Vranov nad Topľou · Prešov Region | 1.23 | 123 | hard |
| Trebišov · Košice Region | 1.22 | 122 | hard |
| Žiar nad Hronom · Banská Bystrica Region | 1.2 | 120 | hard |
| Košice · Košice Region | 1.17 | 117 | moderately hard |
| Veľký Krtíš · Banská Bystrica Region | 1 | 100 | moderately hard |
| Rimavská Sobota · Banská Bystrica Region | 0.98 | 98 | moderately hard |
| Michalovce · Košice Region | 0.94 | 94 | moderately hard |
| Dubnica nad Váhom · Trenčín Region | 0.85 | 85 | moderately hard |
| Handlová · Trenčín Region | 0.75 | 75 | moderately hard |
| Detva · Banská Bystrica Region | 0.7 | 70 | moderately hard |
| Fiľakovo · Banská Bystrica Region | 0.7 | 70 | moderately hard |
| Lučenec · Banská Bystrica Region | 0.66 | 66 | moderately hard |
| Snina · Prešov Region | 0.5 | 50 | soft |