Great Yarmouth Water Hardness & Quality Report (2026)

Great Yarmouth, the seaside resort and port town on the east Norfolk coast at the mouth of the River Yare, is supplied by Anglian Water from the Norfolk Chalk Aquifer. Anglian Water draws from licensed chalk boreholes in the Broadland and east Norfolk chalk area — the Cretaceous Chalk underlying the Norfolk Broads, the Yare and Bure valleys, and the coastal plain — producing hard groundwater with high dissolved calcium. This chalk is overlain by a thin veneer of glacial sediments (boulder clay, sands, and gravels) that permits reasonable recharge while contributing little mineral content of its own. The water is treated at Anglian Water's east Norfolk facilities before distribution to Great Yarmouth. The town's position at the chalk aquifer's discharge edge near the coast produces groundwater at high calcium concentration.

Great Yarmouth's very hard water — 257 mg/L (18.0°Clark) — reflects the Norfolk Cretaceous Chalk Aquifer beneath the Norfolk coastal plain. The chalk here is a Cretaceous Upper and Middle Chalk sequence extending from the chalk escarpment of the Norfolk uplands eastward under the Broads and coastal plain toward the sea. Groundwater in the chalk accumulates very high dissolved calcium over its underground flow path from the recharge area on the chalk hills to the coastal discharge zone at Great Yarmouth. The Drinking Water Inspectorate (DWI) classifies this supply as very hard, consistent with the wider East Anglian chalk zone.

Limescale is a serious household challenge in Great Yarmouth. At 257 mg/L, limescale forms rapidly in kettles — a white crust within one to two weeks requiring fortnightly descaling. Combi-boiler heat exchangers accumulate significant deposits; annual boiler servicing and fitting a polyphosphate scale inhibitor are strongly recommended. Showerheads, taps, and shower screens develop heavy deposits. Washing-up liquid lathers poorly. Using Calgon monthly in the washing machine and maintaining a regular descaling routine is essential limescale management for Great Yarmouth households.