Kesgrave Water Hardness & Quality Report (2026)

Essex and Suffolk Water supplies Kesgrave, the large residential suburb east of Ipswich in Suffolk — a community that grew substantially in the 1970s–90s as private housing estates spread east from Ipswich onto the Suffolk sandling plateau, now a well-established suburb with its own community centre, schools, and retail, adjacent to the RSPB-managed Martlesham Heath on the Sandlings coastal heath — from the Suffolk Chalk (Cretaceous Norwich Chalk) aquifer boreholes in the east Suffolk–Ipswich supply zone, treated at Ipswich Water Treatment Works. At 286.5 mg/L (20.1°Clark) and a TDS of 759.2 mg/L, Kesgrave's water is very hard — consistent with the deep, productive Suffolk Chalk aquifer system of east Suffolk that delivers persistently very hard, mineralised groundwater characteristic of the region.

Kesgrave lies on the east Suffolk Sandling plain east of Ipswich where the Norwich Chalk (Upper Cretaceous) aquifer beneath the Red Crag and Pliocene marine sand deposits delivers hard chalk groundwater. Essex and Suffolk Water draws from deep chalk boreholes in the Ipswich–Kesgrave supply zone, producing 286.5 mg/L with TDS 759.2 mg/L — very hard water with an elevated TDS/hardness ratio (2.65) consistent with sulphate and chloride contributions from the overlying marine Crag formations in the east Suffolk chalk borehole supply zone.

At 286.5 mg/L, limescale is a persistent and significant household problem in Kesgrave. Kettles should be descaled every two to three weeks. The combi-boiler needs a fitted scale inhibitor and annual professional servicing. Washing-up liquid requires generous quantities for adequate lather. Taps and shower heads develop substantial white chalk deposits within a week; a fortnightly descaling with white vinegar or a proprietary product keeps fittings in good condition. A whole-house water softener is a worthwhile investment for Kesgrave households — at 286.5 mg/L, the east Suffolk chalk groundwater provides some of the hardest tap water in England.