TOP 10 HARDEST WATER SUPPLIES - WALES
The ten water supply zones in Wales with the hardest water, ranked from Dŵr Cymru Welsh Water and Hafren Dyfrdwy data. The water hardness data in this chart has been verified by Aquatell directly from primary sources.
| Rank | City / Town / Village(water supply zone) | Council Area | mg/l | gpg | °Clark | °dH | °fH | Source |
|---|---|---|---|---|---|---|---|---|
| 1 | 1. Laugharne, St Clears, WhitlandPendine | Carmarthenshire | 223 | 13 | 15.6 | 12.5 | 22.3 | Source |
| 2 | 2. Llansilin, PontfadogMardy | Powys / Wrexham | 223 | 13 | 15.6 | 12.5 | 22.3 | Source |
| 3 | 3. Four Crosses, Llandrinio, MiddletownFour Crosses | Powys | 220 | 12.8 | 15.4 | 12.3 | 22 | Source |
| 4 | 4. Llanfyllin, Llanfair Caereinion, CaerswsPant | Powys | 217 | 12.7 | 15.2 | 12.1 | 21.7 | Source |
| 5 | 5. GladestryDunfield | Powys | 201 | 11.8 | 14.1 | 11.3 | 20.1 | Source |
| 6 | 6. Knighton, PresteignePilleth / Leintwardine | Powys | 180 | 10.5 | 12.6 | 10.1 | 18 | Source |
| 7 | 7. Hyssington, SneadBishops Moat | Powys | 165 | 9.7 | 11.6 | 9.2 | 16.5 | Source |
| 8 | 8. Chepstow, Caldicot, parts of NewportChepstow / Caldicot | Monmouthshire / Newport | 149 | 8.7 | 10.4 | 8.3 | 14.9 | Source |
| 9 | 9. Llangollen, TrevorLlangollen | Denbighshire / Wrexham | 145 | 8.4 | 10.1 | 8.1 | 14.5 | Source |
| 10 | 10. Prestatyn, Meliden, DyserthPrestatyn | Denbighshire | 144 | 8.4 | 10.1 | 8.1 | 14.4 | Source |
Showing the 10 hardest water supply zones in Wales. Find every town on the full Wales chart.