Mangotsfield Water Hardness & Quality Report (2026)

Mangotsfield, in South Gloucestershire north-east of Bristol near Downend on the Bristol/Gloucestershire border, is supplied by Bristol Water from Chew Valley Lake and Blagdon Lake — the twin Mendip reservoirs — and the River Yeo and Mendip supply catchments. The Mendip reservoirs impound catchments from the Carboniferous Limestone and Devonian country of the north Somerset Mendip Hills. Bristol Water also draws contributions from the Bristol Avon catchment and from Jurassic limestone sources in the north Somerset/south Gloucestershire supply zone. Mangotsfield's north-east Bristol position is slightly further from the core Bristol Mendip supply grid and may receive a higher proportion of the local Jurassic limestone groundwater contribution than the more westerly Kingswood zone, explaining the slightly higher hardness. Bristol Water treats and distributes through the South Gloucestershire network.

Mangotsfield's hardness of 197.5 mg/L (13.9°Clark) is somewhat harder than Kingswood (183 mg/L) in the same South Gloucestershire area, reflecting a higher Carboniferous and Jurassic limestone contribution in the north-east Bristol supply zone. The Drinking Water Inspectorate (DWI) classifies this supply as moderately hard.

Limescale is a regular household concern in Mangotsfield. At 197.5 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 Mangotsfield households.