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+

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.

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

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

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.

View on Amazon

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.

View on Amazon

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.

View on Amazon

Get free water softener quotes

Tell us about your home and we will match you with quotes for softening your hard water. No obligation, takes under a minute.