WG
WaterGrade

Water Hardness in Sunbury-on-Thames

Sunbury-on-Thames has hard water at 253 mg/l CaCO₃. This is above the UK national average of 197.72 mg/l. You may notice limescale buildup on taps, in kettles, and around showerheads.

253

mg/l CaCO₃

HardUK average: 197.72 mg/l
253
0 (Soft)200 (Hard)400+ (Very Hard)

What Does Hard Water Mean?

With a hardness of 253 mg/l, Sunbury-on-Thames has hard water. This level of hardness is common in areas supplied from chalk and limestone aquifers in the South East of England.

You will likely notice white limescale deposits on taps, showerheads, and inside your kettle. Over time, limescale can reduce the efficiency of boilers and heating systems, increasing energy costs. A water softener can help prevent these issues.

Water Supplier

Water Company
Thames Water
Supply Zone
Sunbury East (NLW49)
Source Type
River
Treatment Works
Sunbury East Treatment Works

Full Water Quality Report for Sunbury-on-Thames

See all 8 water quality parameters including pH, chlorine, lead, nitrate, fluoride and more.

View →

Frequently Asked Questions

Is water hard in Sunbury-on-Thames?▾
Yes, Sunbury-on-Thames has hard water at 253 mg/l CaCO₃, classified as "Hard". You will likely notice limescale buildup on taps, in kettles, and around showerheads. A water softener or regular descaling can help manage this.
What is the hardness of water in Sunbury-on-Thames?▾
The water hardness in Sunbury-on-Thames is 253 mg/l CaCO₃ (milligrams per litre of calcium carbonate). This is classified as "Hard" on the standard UK scale and is above the national average of 197.72 mg/l. Water is supplied by Thames Water from river sources.
Who supplies water to Sunbury-on-Thames?▾
Water in Sunbury-on-Thames is supplied by Thames Water, which covers the London and Thames Valley region. The water is sourced from river abstraction and treated at Sunbury East Treatment Works before distribution.
Check another postcode →Browse all hard water areas →