UK Water Companies
Water hardness levels for all 15 UK water suppliers, ranked by average hardness.
| # | Water Company | Avg Hardness | PPM | Level | Postcodes |
|---|---|---|---|---|---|
| 1 | Anglian Water | 321 ppm | Very Hard | 261 | |
| 2 | Thames Water | 302 ppm | Very Hard | 354 | |
| 3 | South East Water | 297 ppm | Hard | 17 | |
| 4 | Affinity Water | 268 ppm | Hard | 33 | |
| 5 | Southern Water | 263 ppm | Hard | 131 | |
| 6 | Portsmouth Water | 261 ppm | Hard | 34 | |
| 7 | SES Water | 239 ppm | Hard | 7 | |
| 8 | Wessex Water | 231 ppm | Hard | 123 | |
| 9 | Severn Trent Water | 221 ppm | Hard | 401 | |
| 10 | Yorkshire Water | 215 ppm | Hard | 218 | |
| 11 | Northumbrian Water | 101 ppm | Slightly Hard | 122 | |
| 12 | South West Water | 80 ppm | Slightly Hard | 129 | |
| 13 | United Utilities | 77 ppm | Slightly Hard | 242 | |
| 14 | Welsh Water (Dwr Cymru) | 68 ppm | Slightly Hard | 214 | |
| 15 | Scottish Water | 54 ppm | Soft | 3 |