South Hayling Water Hardness & Quality Report (2026)

Portsmouth Water supplies South Hayling on Hayling Island, a chalk and gravel peninsula between Langstone Harbour and Chichester Harbour on the Hampshire coast, from the South Downs Chalk via the Havant and Bedhampton chalk springs complex — among the most productive chalk springs in southern England — treated at Havant Water Treatment Works. At 229 mg/L (16.1°Clark), South Hayling's water is hard, reflecting the chalk-dominated South Downs supply that characterises all Portsmouth Water distribution zones across coastal south Hampshire and the Chichester area.

The Havant and Bedhampton Springs emerge from the Upper Chalk of the South Downs at the foot of the chalk dipslope between Havant and Bedhampton, where chalk groundwater discharges as powerful artesian springs from the coastal chalk aquifer at sea level. These springs are recharged by rainfall over the South Downs chalk plateau and carry high dissolved calcium bicarbonate from the chalk journey. Portsmouth Water has abstracted from these chalk springs since the Victorian era, and they supply the majority of the south Hampshire coastal communities including Hayling Island via a distribution network crossing Langstone Harbour.

At 229 mg/L, limescale is a persistent household challenge on Hayling Island. Kettles should be descaled monthly to prevent element damage. The combi-boiler benefits from a fitted scale inhibitor and annual professional servicing. Washing-up liquid requires more product than in softer areas to achieve satisfactory lather. Taps and shower heads develop visible white limescale 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 accumulating permanently on surfaces throughout this hard South Downs chalk-supplied coastal community.