WaterWater Hardness in Wales
205 postcode districts • 6 counties
Slightly Hard
68
Average ppm
20
Minimum ppm
120
Maximum ppm
205
Postcodes
Water Hardness Across Wales
The average water hardness in the Wales region is 68 ppm, classified as slightly hard. Across 205 postcode districts, hardness ranges from 20 ppm to 120 ppm.
The region is served by Welsh Water (Dwr Cymru). Water hardness varies by county — see the breakdown below or check your specific postcode.
Counties in Wales
| County | Avg Hardness | PPM | Level | Postcodes |
|---|---|---|---|---|
| Powys | 113 ppm | Slightly Hard | 8 | |
| Gwent | 83 ppm | Slightly Hard | 18 | |
| West Wales | 72 ppm | Slightly Hard | 51 | |
| Cardiff | 68 ppm | Slightly Hard | 36 | |
| North Wales | 66 ppm | Slightly Hard | 67 | |
| Mid Wales | 43 ppm | Soft | 25 |
Water Companies in Wales
Hard Water Guides
Learn more about water hardness and how to manage it.
Get Water Hardness Updates
Be notified when your water company reports changes to hardness levels.