WaterIs Watford Water Hard or Soft?
Hard at 233 ppm • Greater London, London
The average water hardness in Watford is 233 ppm, classified as hard. Watford is served by Affinity Water, covering 11 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 Watford
| Postcode | Water Company | Hardness | PPM | Level |
|---|---|---|---|---|
| WD25 | Affinity Water | 255 ppm | Hard | |
| WD24 | Affinity Water | 254 ppm | Hard | |
| WD23 | Affinity Water | 253 ppm | Hard | |
| WD7 | Affinity Water | 228 ppm | Hard | |
| WD6 | Affinity Water | 227 ppm | Hard | |
| WD19 | Affinity Water | 226 ppm | Hard | |
| WD5 | Affinity Water | 226 ppm | Hard | |
| WD18 | Affinity Water | 225 ppm | Hard | |
| WD4 | Affinity Water | 225 ppm | Hard | |
| WD17 | Affinity Water | 224 ppm | Hard | |
| WD3 | Affinity Water | 224 ppm | Hard |
Water Companies Serving Watford
Water Hardness Guides
Recommended Products for Watford
Popular choices for households dealing with 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.