Kingswood Water Hardness & Quality Report (2026)

Kingswood, in South Gloucestershire immediately east of Bristol, is supplied by Bristol Water from Chew Valley Lake and Blagdon Lake — the twin Mendip reservoirs in the north Somerset Mendip Hills. Both reservoirs impound catchments on the Carboniferous Limestone and Devonian country of the Mendip Hills, collecting water from limestone moorland that contributes moderate dissolved calcium. Bristol Water also draws from the River Yeo and Cheddar valley spring catchments in the Mendip area. The Carboniferous Limestone of the Mendips is a productive carbonate formation that dissolves moderate calcium in reservoir and spring water, producing a moderately hard supply. Bristol Water treats at Chew Stoke and Barrow Gurney treatment works and distributes through the Bristol and South Gloucestershire network to Kingswood.

Kingswood's hardness of 183 mg/L (12.8°Clark) reflects the Carboniferous Limestone and north Somerset plateau catchment of Bristol Water's Mendip reservoir supply. The chalk and limestone of the north Somerset and Mendip catchments produce moderately hard water typical of the Bristol Water supply zone. The Drinking Water Inspectorate (DWI) classifies this supply as moderately hard.

Limescale is a regular household concern in Kingswood. At 183 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 well. Using Calgon monthly in the washing machine and a regular descaling routine is appropriate limescale management for Kingswood households on the Bristol Water Mendip supply.