Kent · South East

Is Canterbury water hard or soft?

Hard at 255 ppm · 21 postcode districts

  • Supplier Southern Water
  • County Kent
  • Postcodes 21
Area average
255
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Canterbury is 255 ppm, classified as hard. Canterbury is served by Southern Water, covering 21 postcode districts across Kent in the South East region.

Hardness varies across the area — see the table below for a breakdown by postcode district. CT21 has the hardest water at 291 ppm, while CT1 is the softest at 237 ppm.

By postcode

Water Hardness by Postcode in Canterbury

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
CT21 Southern Water
291
291 ppm Hard
CT20 Southern Water
290
290 ppm Hard
CT19 Southern Water
266
266 ppm Hard
CT18 Southern Water
265
265 ppm Hard
CT17 Southern Water
264
264 ppm Hard
CT16 Southern Water
263
263 ppm Hard
CT15 Southern Water
262
262 ppm Hard
CT14 Southern Water
261
261 ppm Hard
CT13 Southern Water
260
260 ppm Hard
CT12 Southern Water
259
259 ppm Hard
CT11 Southern Water
258
258 ppm Hard
CT10 Southern Water
257
257 ppm Hard
CT9 Southern Water
245
245 ppm Hard
CT8 Southern Water
244
244 ppm Hard
CT7 Southern Water
243
243 ppm Hard
CT6 Southern Water
242
242 ppm Hard
CT5 Southern Water
241
241 ppm Hard
CT4 Southern Water
240
240 ppm Hard
CT3 Southern Water
239
239 ppm Hard
CT2 Southern Water
238
238 ppm Hard
CT1 Southern Water
237
237 ppm Hard
Suppliers

Water Companies Serving Canterbury

Tap for full coverage area and hardness data.

Southern Water

263 ppm Hard

Each water company publishes its own hardness data, so you can cross-check the Canterbury figures here against the published hardness data from Southern Water.

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 Canterbury

Popular choices for households dealing with hard water.

Splendid Twin Tank Water Softener

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

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

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 Canterbury water

Is Canterbury water hard or soft?
Canterbury is classified as hard, averaging 255 ppm across 21 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Canterbury has the hardest water?
CT21 has the hardest water in Canterbury at 291 ppm, while CT1 is the softest at 237 ppm. See the full table above for every district.
Which water company supplies Canterbury?
Canterbury is supplied by Southern Water, covering 21 postcode districts across Kent.
Is tap water in Canterbury safe to drink?
Yes. All tap water in Canterbury meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Canterbury?
At 255 ppm, many households in Canterbury 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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