Water Hardness in Marlow
Marlow has very hard water at 312 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.
312
mg/l CaCO₃
Very HardUK average: 197.72 mg/l
312
0 (Soft)200 (Hard)400+ (Very Hard)
What Does Very Hard Water Mean?
With a hardness of 312 mg/l, Marlow 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
- Marlow (SWA6)
- Source Type
- Groundwater
- Treatment Works
- Marlow Treatment Works
Full Water Quality Report for Marlow
See all 8 water quality parameters including pH, chlorine, lead, nitrate, fluoride and more.
Frequently Asked Questions
Is water hard in Marlow?▾
Yes, Marlow has hard water at 312 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 Marlow?▾
The water hardness in Marlow is 312 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 Marlow?▾
Water in Marlow is supplied by Thames Water, which covers the London and Thames Valley region. The water is sourced from underground aquifers (boreholes) and treated at Marlow Treatment Works before distribution.