Kempston Water Hardness & Quality Report (2026)

Anglian Water supplies Kempston, a town on the western fringe of Bedford, from groundwater drawn from the Chalk aquifer of central Bedfordshire and surface water from the River Great Ouse, treated at Bedford Water Treatment Works before distribution across the Bedford urban area. At 248.5 mg/L (17.4°Clark), Kempston's water is in the upper end of the hard category, driven by the chalk geology underlying central Bedfordshire and the chalk-rich character of the River Great Ouse.

The Upper Cretaceous Chalk of the Chilterns and the Bedfordshire chalk dip slope feeds a productive aquifer from which Anglian Water abstracts groundwater south of Bedford. This chalk groundwater has percolated through porous limestone over long periods, dissolving calcium carbonate into solution as it descends from the Chiltern escarpment northward beneath the clay vale. The River Great Ouse reinforces the hardness of the supply, having drained chalk catchments through Northamptonshire and Buckinghamshire before reaching Bedford and being abstracted for treatment alongside borehole water.

Limescale is a persistent domestic concern in Kempston. Kettles should be descaled monthly, with fortnightly descaling preferable for households that use the kettle frequently, to prevent element damage and calcium particles in drinks. The combi-boiler benefits from a fitted scale inhibitor to protect the heat exchanger from calcium carbonate accumulation, and annual servicing is recommended. Washing-up liquid requires more product than in softer-water areas to achieve a satisfactory lather. Taps and shower heads develop visible white limescale within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaler helps prevent permanent hard-water staining and protects fittings and seals from progressive calcium damage.