Greater London · London

Is Watford water hard or soft?

Hard at 233 ppm · 11 postcode districts

  • Supplier Affinity Water
  • County Greater London
  • Postcodes 11
Area average
233
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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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. WD25 has the hardest water at 255 ppm, while WD3 is the softest at 224 ppm.

By postcode

Water Hardness by Postcode in Watford

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
WD25 Affinity Water
255
255 ppm Hard
WD24 Affinity Water
254
254 ppm Hard
WD23 Affinity Water
253
253 ppm Hard
WD7 Affinity Water
228
228 ppm Hard
WD6 Affinity Water
227
227 ppm Hard
WD19 Affinity Water
226
226 ppm Hard
WD5 Affinity Water
226
226 ppm Hard
WD18 Affinity Water
225
225 ppm Hard
WD4 Affinity Water
225
225 ppm Hard
WD17 Affinity Water
224
224 ppm Hard
WD3 Affinity Water
224
224 ppm Hard
Suppliers

Water Companies Serving Watford

Tap for full coverage area and hardness data.

Affinity Water

268 ppm Hard

Water Hardness Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Effects Solutions Water Softeners Limescale Removal
Recommended

Products for Watford

Popular choices for households dealing with hard water.

Splendid Twin Tank Water Softener

From ~£400

Twin-tank electric softener sized for 1 to 7 bedroom homes. Removes limescale from pipes, boilers, and appliances and delivers continuous soft water, with metered regeneration to keep salt use low.

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Philips Shower Filter

From ~£30

Quick win for skin and hair in hard water areas. Reduces chlorine and limescale, fits standard shower hoses in minutes, no tools needed. Cartridge lasts around 6 months.

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BRITA Marella Water Filter Jug

From ~£20

UK's best-selling filter jug. Reduces limescale, chlorine, and metals for better-tasting tap water. Quick first step alongside a softener.

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FAQ

Common questions about Watford water

Is Watford water hard or soft?
Watford is classified as hard, averaging 233 ppm across 11 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Watford has the hardest water?
WD25 has the hardest water in Watford at 255 ppm, while WD3 is the softest at 224 ppm. See the full table above for every district.
Which water company supplies Watford?
Watford is supplied by Affinity Water, covering 11 postcode districts across Greater London.
Is tap water in Watford safe to drink?
Yes. All tap water in Watford meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Watford?
At 233 ppm, many households in Watford notice limescale in kettles and showerheads within weeks. A shower filter is the cheapest first step; a whole-house softener gives the most complete protection.
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