How Plymouth compares
At 14 mg/L (1.0 °Clark), Plymouth is 94% below the median of the 411 English towns on this map (243 mg/L). It ranks 406 of 411 for hardness (1 is the hardest).
Water hardness in Plymouth
Plymouth has soft water: limescale is hardly a problem here.
Data
| Value | 14 mg/L calcium carbonate 1.0 °Clark, 0.8 °dH |
|---|---|
| Band | soft |
| Area | Devon |
| Population | 260,203 |
| Water company | South West Water |
| Postcode checked | PL1 1RR (Mayflower North Supply Zone) |
| Checked | 21 Oct 2026 |
| From the source | “"classification":"Soft","partsPerMillion":17,"clarkeDegrees":1,"frenchDegrees":2,"germanDegrees":1” |
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 Plymouth?
The water company's figure for Plymouth is 14 mg/L (1.0 °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
Plymstock 4 km Paignton 41 km Newton Abbot 41 km St Austell 45 km Torquay 45 km Exeter 59 km Exmouth 59 km Falmouth 70 km