Amesbury Water Hardness & Quality Report (2026)

Wessex Water supplies Amesbury, the Wiltshire town on the Salisbury Plain near Stonehenge — the settlement nearest to one of the world's most celebrated prehistoric monuments, sited at the confluence of the Avon and the Wiltshire Avon valley on the chalk plain, a community that has existed in some form since well before Stonehenge itself was raised in the Neolithic period — from the Salisbury Plain Chalk (Cretaceous) aquifer boreholes in the Wiltshire Amesbury–Salisbury supply zone, treated at Bourne Valley Water Treatment Works near Andover. At 161 mg/L (11.3°Clark), Amesbury's water is hard — reflecting calcium from the Cretaceous Chalk of Salisbury Plain, one of the purest chalk landscapes in England, with a moderate TDS/hardness ratio (2.28) confirming predominantly carbonate chalk hardness.

Amesbury sits on the Salisbury Plain Chalk downland — the same chalk tableland that supports the ancient Stonehenge monument and the prehistoric Avebury circle. Wessex Water draws from Chalk boreholes in the Wiltshire Avon chalk valley, delivering 161 mg/L with TDS 367.3 mg/L — hard, predominantly carbonate chalk water consistent with the Wessex Water Salisbury Plain distribution tier at Salisbury (165 mg/L) and Tidworth in the same chalk supply zone.

At 161 mg/L, limescale is a consistent household challenge in Amesbury. Kettles should be descaled monthly. The combi-boiler benefits from a fitted scale inhibitor and annual professional servicing. Washing-up liquid requires more product per wash. Taps and shower heads develop visible white limescale deposits within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaling product keeps fittings clean. The hard chalk supply at Amesbury is as characteristic of Salisbury Plain as the great bluestone monument that draws visitors from around the world — the same Cretaceous Chalk that cradles Stonehenge also mineralises the water in every household on the plain.