WaterIs Kingston Upon Thames Water Hard or Soft?
Very Hard at 310 ppm • Greater London, London
The average water hardness in Kingston Upon Thames is 310 ppm, classified as very hard. Kingston Upon Thames is served by Thames Water, covering 24 postcode districts across Greater London in the London region.
Hardness varies across the area — see the table below for a breakdown by postcode district.
Water Hardness by Postcode in Kingston Upon Thames
| Postcode | Water Company | Hardness | PPM | Level |
|---|---|---|---|---|
| KT24 | Thames Water | 346 ppm | Very Hard | |
| KT23 | Thames Water | 345 ppm | Very Hard | |
| KT22 | Thames Water | 344 ppm | Very Hard | |
| KT21 | Thames Water | 343 ppm | Very Hard | |
| KT20 | Thames Water | 342 ppm | Very Hard | |
| KT19 | Thames Water | 318 ppm | Very Hard | |
| KT18 | Thames Water | 317 ppm | Very Hard | |
| KT17 | Thames Water | 316 ppm | Very Hard | |
| KT16 | Thames Water | 315 ppm | Very Hard | |
| KT15 | Thames Water | 314 ppm | Very Hard | |
| KT14 | Thames Water | 313 ppm | Very Hard | |
| KT13 | Thames Water | 312 ppm | Very Hard | |
| KT12 | Thames Water | 311 ppm | Very Hard | |
| KT11 | Thames Water | 310 ppm | Very Hard | |
| KT10 | Thames Water | 309 ppm | Very Hard | |
| KT9 | Thames Water | 291 ppm | Hard | |
| KT8 | Thames Water | 290 ppm | Hard | |
| KT7 | Thames Water | 289 ppm | Hard | |
| KT6 | Thames Water | 288 ppm | Hard | |
| KT5 | Thames Water | 287 ppm | Hard | |
| KT4 | Thames Water | 286 ppm | Hard | |
| KT3 | Thames Water | 285 ppm | Hard | |
| KT2 | Thames Water | 284 ppm | Hard | |
| KT1 | Thames Water | 283 ppm | Hard |
Water Companies Serving Kingston Upon Thames
Water Hardness Guides
Recommended Products for Kingston Upon Thames
Popular choices for households dealing with very hard water in this area.
Water2Buy W2B200 Water Softener
From ~£400Best-value whole-house ion-exchange softener for UK homes. Eliminates limescale from pipes, boilers, and appliances. Digital metered regeneration — low salt use. 7-year warranty.
View on AmazonPhilips AWP1775 Shower Filter
From ~£30Quick win for skin and hair in hard water areas. Reduces chlorine and limescale — fits standard shower hoses in minutes, no tools needed. Cartridge lasts ~6 months.
View on AmazonBRITA Marella Water Filter Jug
From ~£20UK's best-selling filter jug. Reduces limescale, chlorine, and metals for better-tasting tap water. Quick first step alongside a softener.
View on AmazonGet Water Hardness Updates
Be notified when your water company reports changes to hardness levels.