Water Hardness in Marlborough
Marlborough has very hard water at 302 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.
302
mg/l CaCO₃
Very HardUK average: 197.72 mg/l
302
0 (Soft)200 (Hard)400+ (Very Hard)
What Does Very Hard Water Mean?
With a hardness of 302 mg/l, Marlborough has very 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
- Marlborough (S9)
- Source Type
- Groundwater
- Treatment Works
- Marlborough Treatment Works
Full Water Quality Report for Marlborough
See all 8 water quality parameters including pH, chlorine, lead, nitrate, fluoride and more.
Frequently Asked Questions
Is water hard in Marlborough?▾
Yes, Marlborough has hard water at 302 mg/l CaCO₃, classified as "Very 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 Marlborough?▾
The water hardness in Marlborough is 302 mg/l CaCO₃ (milligrams per litre of calcium carbonate). This is classified as "Very Hard" on the standard UK scale and is above the national average of 197.72 mg/l. Water is supplied by Thames Water from underground aquifer sources.
Who supplies water to Marlborough?▾
Water in Marlborough is supplied by Thames Water, which covers the London and Thames Valley region. The water is sourced from underground aquifers (boreholes) and treated at Marlborough Treatment Works before distribution.