Newmarket Water Hardness & Quality Report (2026)

Anglian Water supplies Newmarket, the famous horse-racing town on the Suffolk–Cambridgeshire border. The town's water is drawn from a blend of groundwater from the Chalk aquifer of west Suffolk and east Cambridgeshire and surface water from the River Lark system, treated at Isleham Water Treatment Works and regional facilities before distribution. At 183 mg/L (12.8°Clark), Newmarket's water is moderately hard — a level reflecting the chalk geology underlying this corner of East Anglia, where the chalk forms low downland ridges between the Fens and the Suffolk clay plain.

The Upper Cretaceous Chalk of west Suffolk forms the Newmarket Heath plateau — a broad, gently undulating chalk swathe on which the town and its famous training gallops sit. Groundwater infiltrating this chalk has dissolved calcium carbonate through slow percolation, producing water with high bicarbonate hardness characteristic of chalk aquifer sources across East Anglia. The River Lark rises on the chalk upland south of Bury St Edmunds and maintains moderate chalky hardness throughout its catchment, contributing a surface water component to the blended supply that reinforces the chalk character.

At 183 mg/L, limescale is a noticeable but manageable issue in Newmarket homes. Kettles benefit from descaling every four to six weeks to maintain element efficiency and avoid chalky deposits in hot drinks. The combi-boiler should be fitted with a scale inhibitor and serviced annually. Washing-up liquid works well at normal quantities, though slightly less lather than in softer-water areas may be noticed. Taps and shower heads accumulate visible limescale over several weeks; a monthly wipe with white vinegar or a proprietary descaler is generally sufficient to keep fittings clean and in good working order.