Horbury Water Hardness & Quality Report (2026)

Yorkshire Water supplies Horbury, the Wakefield suburb in the Calder Valley — a former textile and engineering community near Wakefield, with a distinctive St Peter and St Leonard's Church (built in 1791 by the local architect John Carr of York as a monument to himself), and a setting in the productive Calder Valley at the heart of the West Yorkshire coalfield and Magnesian Limestone belt — from Pennine upland reservoirs blended with Magnesian Limestone (Permian) and Permo-Triassic Sherwood Sandstone groundwater in the Wakefield Calder Valley distribution zone, treated at Tophill Low Water Treatment Works near Driffield. At 213 mg/L (14.9°Clark) and a TDS of 628.6 mg/L, Horbury's water is hard with a very elevated TDS/hardness ratio (2.95) — one of the highest in the Yorkshire Water supply network — indicating significant sulphate from the Magnesian Limestone (with anhydrite and gypsum beds) and the Coal Measures that dominate the Wakefield and Calder Valley geology.

Horbury lies in the Calder Valley directly on the Magnesian Limestone belt — the Permian Zechstein limestone ridge that runs from Durham through Yorkshire to Nottingham, containing significant dolomite, anhydrite, and gypsum (calcium sulphate) beds. Yorkshire Water supplies Horbury with Pennine reservoir supply blended with a proportion of Magnesian Limestone and Permo-Triassic groundwater, and the gypsum and anhydrite content of the Magnesian Limestone dramatically elevates the TDS, producing 213 mg/L with TDS 628.6 mg/L — hard water with a TDS/hardness ratio of 2.95, reflecting the high sulphate content of the Magnesian Limestone aquifer.

At 213 mg/L, limescale is a persistent household challenge in Horbury. Kettles should be descaled monthly. The combi-boiler benefits from a fitted scale inhibitor and annual professional servicing. Washing-up liquid requires more product per wash. Taps and shower heads develop visible white limescale deposits within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaling product keeps fittings clean. Horbury's hard, sulphate-elevated supply is characteristic of the Magnesian Limestone belt — the Permian gypsum beds of the Wakefield area contributing both calcium and sulphate to the water of this Calder Valley community.