Is Colchester a hard water area?
Yes. Tap water across the CO postcode area is very hard, the top band on the scale water companies use, with a median of 313 mg/L calcium carbonate. It ranges from 227 mg/L in CO7 to 394 mg/L in CO9, from 16 districts with their own water company reading.
- Soft
- Moderately soft
- Slightly hard
- Very hard
- Soft
- 0 to 60 mg/L
- Moderately soft
- 60 to 120 mg/L
- Slightly hard
- 120 to 180 mg/L
- Hard
- 180 to 200 mg/L
- Very hard
- 200 to 400 mg/L
Hardness by CO district
Hardest first. Hard starts at 180 mg/L, very hard at 250.
| District | mg/L | Hardness |
|---|---|---|
| CO9 | 394 | very hard |
| CO10 | 378 | very hard |
| CO8 | 376 | very hard |
| CO6 | 376 | very hard |
| CO13 | 359 | very hard |
| CO14 | 359 | very hard |
| CO2 | 314 | very hard |
| CO3 | 314 | very hard |
| CO12 | 312 | very hard |
| CO11 | 312 | very hard |
| CO16 | 306 | very hard |
| CO15 | 306 | very hard |
| CO4 | 304 | very hard |
| CO1 | 304 | very hard |
| CO5 | 282 | very hard |
| CO7 | 227 | hard |
Softener quotes for Colchester
At 313 mg/L most CO homes get their money back on a softener within a few years. Free quotes from installers covering your postcode, no obligation.
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Check your exact postcode
The area figure is a median. Your district can sit anywhere between 227 and 394 mg/L.
Nearby areas
- Is Colchester a hard water area?
- Yes. The median hardness across CO postcode districts is 313 mg/L calcium carbonate, which is very hard. 100% of the 16 districts we hold readings for are hard or very hard (180 mg/L and above).
- What is the water hardness in Colchester?
- Between 227 and 394 mg/L depending on the district, with a median of 313. The hardest measured district is CO9 at 394 mg/L and the softest is CO7 at 227. Figures come from water company drinking-water tests.
- Do I need a water softener in Colchester?
- In most CO homes a softener pays for itself: at 313 mg/L kettles, boilers and showers scale up quickly. Check your own district first, because hardness varies from 227 to 394 within the area.
Hardness as mg/L calcium carbonate from water company drinking-water tests and postcode checkers. See the UK hardness map for every area.