How St Austell compares
At 28 mg/L (2.0 °Clark), St Austell is 88% below the median of the 411 English towns on this map (243 mg/L). It ranks 384 of 411 for hardness (1 is the hardest).
Water hardness in St Austell
St Austell has soft water: limescale is hardly a problem here.
Data
| Value | 28 mg/L calcium carbonate 2.0 °Clark, 1.6 °dH |
|---|---|
| Band | soft |
| Area | Cornwall |
| Population | 24,360 |
| Water company | South West Water |
| Postcode checked | PL25 3FD (Restormel East supply zone) |
| Checked | 21 Oct 2026 |
| From the source | “"classification":"Soft","partsPerMillion":33,"clarkeDegrees":2,"frenchDegrees":3,"germanDegrees":2” |
What it means for your home
Soft water leaves almost no scale. Kettles, showers and appliances stay clean for a long time.
You do not need a softener. Use a low detergent dose: more only leaves residue.
How often to descale
As a rule of thumb for soft water, kettles and shower heads need descaling every three or four months. Descale whenever you see scale building up.
Common questions
Is hard water bad for you?
No. Hard water carries calcium and magnesium, minerals the body uses. Whether tap water is safe depends on germs and pollutants, which water companies test for, not on hardness.
Do I need a water softener in St Austell?
The water company's figure for St Austell is 28 mg/L (2.0 °Clark), which is soft water. Usually not straight away. Set the dishwasher, dose detergent for your band and descale regularly. Get quotes for a softener only if scale is clearly damaging your boiler or appliances.
How do I find the value for my address?
Use your water company's postcode checker. Hardness can differ between districts, so check your own postcode, or test with strips or a drop test.
Nearby towns
Falmouth 30 km Redruth 34 km Plymouth 45 km Plymstock 49 km Newton Abbot 85 km Bideford 85 km Paignton 86 km Torquay 90 km