CF10 Water Hardness
Based on nearest verified measurement point: Cardiff (0.9 km away)
Calcium Carbonate equivalent · Nearest municipality: Cardiff
Admin area: Cardiff
What This Means for Your Home
Kettle descaling
Every 3–4 months
Dishwasher salt
Every 3 months
Boiler risk
Low
Shower filter
Optional
Tools for Your Hardness Level
Boiler Warranty Checker
See if your hardness voids your warranty
Dishwasher Salt Settings
Calibrate for 115 mg/L
Skin & Hair Checker
Check eczema and hair damage risk
Baby Formula Safety
Is it safe to make formula with your water?
Limescale Cost Estimator
Annual cost of hard water for appliances
Pool Chemical Calculator
Doses adjusted for your source water
Data note: Postcode hardness is matched to the nearest verified municipal measurement point in our dataset. Actual hardness at your specific address may vary slightly depending on local pipe infrastructure and your water supplier's supply zone. For verified postcode-level data, consult your water supplier directly. Water supply company for this area: Welsh Water.