WaterWater Hardness in Hemel Hempstead
Hertfordshire, South East • 24 postcode districts
Hard
The average water hardness in Hemel Hempstead is 288 ppm, classified as hard. Hemel Hempstead is served by Thames Water, covering 24 postcode districts across Hertfordshire 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 Hemel Hempstead
| Postcode | Water Company | Hardness | PPM | Level |
|---|---|---|---|---|
| HP9 | Thames Water | 326 ppm | Very Hard | |
| HP8 | Thames Water | 325 ppm | Very Hard | |
| HP7 | Thames Water | 324 ppm | Very Hard | |
| HP6 | Thames Water | 323 ppm | Very Hard | |
| HP5 | Thames Water | 322 ppm | Very Hard | |
| HP4 | Thames Water | 321 ppm | Very Hard | |
| HP3 | Thames Water | 320 ppm | Very Hard | |
| HP2 | Thames Water | 319 ppm | Very Hard | |
| HP1 | Thames Water | 318 ppm | Very Hard | |
| HP27 | Thames Water | 292 ppm | Hard | |
| HP23 | Thames Water | 288 ppm | Hard | |
| HP22 | Thames Water | 287 ppm | Hard | |
| HP21 | Thames Water | 286 ppm | Hard | |
| HP20 | Thames Water | 285 ppm | Hard | |
| HP19 | Thames Water | 261 ppm | Hard | |
| HP18 | Thames Water | 260 ppm | Hard | |
| HP17 | Thames Water | 259 ppm | Hard | |
| HP16 | Thames Water | 258 ppm | Hard | |
| HP15 | Thames Water | 257 ppm | Hard | |
| HP14 | Thames Water | 256 ppm | Hard | |
| HP13 | Thames Water | 255 ppm | Hard | |
| HP12 | Thames Water | 254 ppm | Hard | |
| HP11 | Thames Water | 253 ppm | Hard | |
| HP10 | Thames Water | 252 ppm | Hard |
Water Companies Serving Hemel Hempstead
Get Water Hardness Updates
Be notified when your water company reports changes to hardness levels.