Broadstone Water Hardness & Quality Report (2026)

Bournemouth Water (now part of South West Water) supplies Broadstone, the residential suburb in the Bournemouth, Christchurch and Poole council area between Wimborne Minster and Poole — a well-maintained suburban community with leafy residential streets, a good local centre, and strong demand from those seeking a quieter setting within reach of both the Poole waterfront and the Dorset countryside — from the Dorset Chalk (Cretaceous) aquifer boreholes in the north Poole–Wimborne supply zone, treated at Alton Road Water Treatment Works in Bournemouth. At 151.5 mg/L (10.6°Clark), Broadstone's water is moderately hard — consistent with a Dorset Chalk supply blended with Eocene Thames Group surface water from the Hampshire Basin, producing a moderately mineralised supply.

Broadstone lies in the north Poole Basin on Eocene Bagshot Beds (Tertiary sands and gravels) above the Dorset Chalk aquifer. Bournemouth Water supplies from the Dorset chalk boreholes at the northern Poole fringe, with a relatively modest chalk contribution producing 151.5 mg/L with TDS 339.1 mg/L — moderately hard water with a moderate TDS/hardness ratio (2.24) confirming predominantly carbonate chalk hardness, consistent with the Bournemouth Water north Poole supply zone at Wimborne Minster (152 mg/L) and Ferndown in the same supply corridor.

At 151.5 mg/L, limescale is a consistent household concern in Broadstone. Kettles benefit from descaling every four to six weeks. The combi-boiler should be fitted with a scale inhibitor and serviced annually. Washing-up liquid requires more product per wash than in soft-water areas. Taps and shower heads develop moderate limescale deposits within two to three weeks; a monthly wipe with white vinegar or a proprietary descaling product keeps fittings in good condition. The moderately hard chalk supply at Broadstone is as characteristic of the north Dorset Poole basin as the rolling heathland of the Dorset Heaths that frame the suburb's outskirts.