Greater London · London

Is Croydon water hard or soft?

Hard at 297 ppm · 9 postcode districts

  • Supplier South East Water
  • County Greater London
  • Postcodes 9
Area average
297
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Croydon is 297 ppm, classified as hard. Croydon is served by South East Water, covering 9 postcode districts across Greater London in the London region.

Hardness varies across the area — see the table below for a breakdown by postcode district. CR9 has the hardest water at 301 ppm, while CR0 is the softest at 292 ppm.

By postcode

Water Hardness by Postcode in Croydon

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
CR9 South East Water
301
301 ppm Very Hard
CR8 South East Water
300
300 ppm Hard
CR7 South East Water
299
299 ppm Hard
CR6 South East Water
298
298 ppm Hard
CR5 South East Water
297
297 ppm Hard
CR4 South East Water
296
296 ppm Hard
CR3 South East Water
295
295 ppm Hard
CR2 South East Water
294
294 ppm Hard
CR0 South East Water
292
292 ppm Hard
Suppliers

Water Companies Serving Croydon

Tap for full coverage area and hardness data.

South East Water

297 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 Croydon

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 Croydon water

Is Croydon water hard or soft?
Croydon is classified as hard, averaging 297 ppm across 9 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Croydon has the hardest water?
CR9 has the hardest water in Croydon at 301 ppm, while CR0 is the softest at 292 ppm. See the full table above for every district.
Which water company supplies Croydon?
Croydon is supplied by South East Water, covering 9 postcode districts across Greater London.
Is tap water in Croydon safe to drink?
Yes. All tap water in Croydon meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Croydon?
At 297 ppm, many households in Croydon 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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