WaterWater Hardness in Southampton
Hampshire, South East • 23 postcode districts
Hard
The average water hardness in Southampton is 219 ppm, classified as hard. Southampton is served by Severn Trent Water, covering 23 postcode districts across Hampshire 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 Southampton
| Postcode | Water Company | Hardness | PPM | Level |
|---|---|---|---|---|
| SO45 | Severn Trent Water | 286 ppm | Hard | |
| SO43 | Severn Trent Water | 284 ppm | Hard | |
| SO42 | Severn Trent Water | 283 ppm | Hard | |
| SO41 | Severn Trent Water | 282 ppm | Hard | |
| SO40 | Severn Trent Water | 281 ppm | Hard | |
| SO32 | Severn Trent Water | 250 ppm | Hard | |
| SO31 | Severn Trent Water | 249 ppm | Hard | |
| SO30 | Severn Trent Water | 248 ppm | Hard | |
| SO24 | Severn Trent Water | 219 ppm | Hard | |
| SO23 | Severn Trent Water | 218 ppm | Hard | |
| SO22 | Severn Trent Water | 217 ppm | Hard | |
| SO21 | Severn Trent Water | 216 ppm | Hard | |
| SO20 | Severn Trent Water | 215 ppm | Hard | |
| SO19 | Severn Trent Water | 191 ppm | Hard | |
| SO18 | Severn Trent Water | 190 ppm | Hard | |
| SO17 | Severn Trent Water | 189 ppm | Hard | |
| SO16 | Severn Trent Water | 188 ppm | Hard | |
| SO15 | Severn Trent Water | 187 ppm | Hard | |
| SO14 | Severn Trent Water | 186 ppm | Hard | |
| SO53 | Severn Trent Water | 166 ppm | Moderately Hard | |
| SO52 | Severn Trent Water | 165 ppm | Moderately Hard | |
| SO51 | Severn Trent Water | 164 ppm | Moderately Hard | |
| SO50 | Severn Trent Water | 163 ppm | Moderately Hard |
Water Companies Serving Southampton
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