Cudworth Water Hardness & Quality Report (2026)

Yorkshire Water supplies Cudworth, a former coalmining village north of Barnsley in South Yorkshire — a community of interwar and postwar housing in the Dearne Valley coalfield, set between the A628 Barnsley–Castleford road corridor and the River Dearne — from Pennine upland reservoir supply blended with Permian Magnesian Limestone groundwater in the Barnsley distribution zone, treated at Blackburn Meadows Water Treatment Works in the Don Valley near Sheffield. At 220.5 mg/L (15.5°Clark) and a TDS of 651 mg/L, Cudworth's water is hard with a notably elevated TDS/hardness ratio (3.0) indicating significant sulphate content from Carboniferous Coal Measures and Permian Magnesian Limestone geology east of Barnsley.

Cudworth lies east of Barnsley on the Carboniferous Coal Measures plain, where the Permian Magnesian Limestone begins its dip beneath the Coal Measures in the low ridge east of town. Yorkshire Water blends soft Pennine reservoir supply with a significant Magnesian Limestone groundwater fraction in the Barnsley distribution zone, contributing calcium, magnesium, and elevated sulphate that raises TDS to 651 mg/L against 220.5 mg/L hardness — a characteristically elevated-sulphate hard water typical of the South Yorkshire Coal Measures and Magnesian Limestone border zone.

At 220.5 mg/L, limescale is a persistent household challenge in Cudworth. 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. The hard and notably sulphate-tinged Barnsley supply is a daily domestic reminder of the Permian limestone geology that underlies the coalfield communities of the Dearne Valley.