Bentley Water Hardness & Quality Report (2026)

Bentley, a northern suburb of Doncaster in the Borough of Doncaster on the south Yorkshire plain, is supplied by Yorkshire Water from the River Don catchment and the South Yorkshire Magnesian Limestone zone. Yorkshire Water serves the Doncaster area from a blend of Pennine reservoir supply — soft upland water from the Carboniferous Millstone Grit of the Pennines — and groundwater from the Permian Magnesian Limestone of south and west Yorkshire, which runs north from Worksop through Doncaster toward the Humber. The Magnesian Limestone (a dolomitic Permian limestone) west and north of Doncaster contributes hard, calcium- and magnesium-rich groundwater that raises the supply hardness from the low soft base provided by the Pennine reservoir supply. Bentley at the northern edge of Doncaster reflects this blended supply.

Bentley's hardness of 171.5 mg/L (12.0°Clark) reflects the Yorkshire Water blend of soft Pennine reservoir supply and hard South Yorkshire Magnesian Limestone groundwater in the Doncaster supply zone. The TDS of 450.2 mg/L confirms elevated mineral content from the Magnesian Limestone. The Drinking Water Inspectorate (DWI) classifies this supply as moderately hard.

Limescale is a regular household concern in Bentley. At 171.5 mg/L, limescale forms in kettles within three to four weeks and monthly descaling is sensible. Combi-boiler heat exchangers accumulate deposits at a moderate rate; annual servicing is recommended. Showerheads and taps develop consistent deposits. Washing-up liquid lathers moderately. Using Calgon monthly in the washing machine and a regular descaling routine is appropriate limescale management for Bentley households.