Emsworth Water Hardness & Quality Report (2026)

Portsmouth Water supplies Emsworth, a harbour town on the Chichester Harbour in south-east Hampshire. The company's supply is drawn from a series of chalk springs and boreholes at Havant and Bedhampton, where the South Downs Chalk aquifer discharges at the spring line at the foot of the downland escarpment, treated at Bedhampton Water Treatment Works before distribution across the Portsmouth and east Hampshire supply area. At 213.5 mg/L (15.0°Clark), Emsworth's water is hard, reflecting the chalk groundwater that characterises the Portsmouth Water supply zone along the foot of the South Downs.

The South Downs north of Emsworth are underlain by thick Upper Cretaceous Chalk — the aquifer that feeds the Havant and Bedhampton springs. Groundwater infiltrating the downs percolates through porous chalk over long residence times, dissolving calcium carbonate extensively via the carbonic acid mechanism. The spring line at Havant and Bedhampton is where confined chalk groundwater emerges at the surface, having accumulated high calcium bicarbonate concentrations during its underground journey from the chalk recharge area further north and west.

Limescale is a consistent domestic concern in Emsworth. Kettles should be descaled monthly to maintain efficiency and prevent chalky deposits in drinks. The combi-boiler benefits from a fitted scale inhibitor to protect the heat exchanger from calcium carbonate build-up, and annual servicing is recommended. Washing-up liquid requires slightly more product than in softer areas to achieve a satisfactory lather. Taps and shower heads develop visible white limescale deposits within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaling solution keeps fittings clean and prevents hard-water staining from building up on surfaces and fixture seals.