WaterWater Hardness in Guildford
Surrey, South East • 38 postcode districts
Hard
The average water hardness in Guildford is 296 ppm, classified as hard. Guildford is served by Thames Water, covering 38 postcode districts across Surrey in the South East region.
Hardness varies across the area — see the table below for a breakdown by postcode district.
Water Hardness by Postcode in Guildford
| Postcode | Water Company | Hardness | PPM | Level |
|---|---|---|---|---|
| GU35 | Thames Water | 333 ppm | Very Hard | |
| GU34 | Thames Water | 332 ppm | Very Hard | |
| GU33 | Thames Water | 331 ppm | Very Hard | |
| GU32 | Thames Water | 330 ppm | Very Hard | |
| GU31 | Thames Water | 329 ppm | Very Hard | |
| GU30 | Thames Water | 328 ppm | Very Hard | |
| GU9 | Thames Water | 311 ppm | Very Hard | |
| GU8 | Thames Water | 310 ppm | Very Hard | |
| GU7 | Thames Water | 309 ppm | Very Hard | |
| GU6 | Thames Water | 308 ppm | Very Hard | |
| GU5 | Thames Water | 307 ppm | Very Hard | |
| GU4 | Thames Water | 306 ppm | Very Hard | |
| GU3 | Thames Water | 305 ppm | Very Hard | |
| GU2 | Thames Water | 304 ppm | Very Hard | |
| GU29 | Thames Water | 304 ppm | Very Hard | |
| GU1 | Thames Water | 303 ppm | Very Hard | |
| GU28 | Thames Water | 303 ppm | Very Hard | |
| GU27 | Thames Water | 302 ppm | Very Hard | |
| GU26 | Thames Water | 301 ppm | Very Hard | |
| GU25 | Thames Water | 300 ppm | Hard | |
| GU24 | Thames Water | 299 ppm | Hard | |
| GU23 | Thames Water | 298 ppm | Hard | |
| GU22 | Thames Water | 297 ppm | Hard | |
| GU21 | Thames Water | 296 ppm | Hard | |
| GU20 | Thames Water | 295 ppm | Hard | |
| GU52 | Thames Water | 295 ppm | Hard | |
| GU51 | Thames Water | 294 ppm | Hard | |
| GU19 | Thames Water | 271 ppm | Hard | |
| GU18 | Thames Water | 270 ppm | Hard | |
| GU17 | Thames Water | 269 ppm | Hard | |
| GU16 | Thames Water | 268 ppm | Hard | |
| GU15 | Thames Water | 267 ppm | Hard | |
| GU47 | Thames Water | 267 ppm | Hard | |
| GU14 | Thames Water | 266 ppm | Hard | |
| GU46 | Thames Water | 266 ppm | Hard | |
| GU12 | Thames Water | 264 ppm | Hard | |
| GU11 | Thames Water | 263 ppm | Hard | |
| GU10 | Thames Water | 262 ppm | Hard |
Water Companies Serving Guildford
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