Ivybridge Water Hardness & Quality Report (2026)

South West Water supplies Ivybridge, the south Devon town on the River Erme at the southern edge of Dartmoor National Park — a community that expanded rapidly in the 1970s and 1980s with new housing estates on the Dartmoor fringe, retaining its Victorian paper mill heritage at Stowford Paper Mill — from a blend of Devonian Limestone spring supply and soft Dartmoor upland reservoir sources in the south Devon distribution zone, treated at Crownhill Water Treatment Works near Plymouth. At 212.5 mg/L (14.9°Clark) and a TDS of 585.9 mg/L, Ivybridge's water is hard — notably harder than the typical south Dartmoor baseline — reflecting significant calcium loading from the Plymouth Limestone Formation (Devonian Limestone) geology of the south Devon karst plateau.

Ivybridge sits at the junction of the soft Dartmoor Granite and the Devonian Limestone of the south Hams — a geological boundary where limestone springs from the Plymouth Limestone karst contribute significant calcium bicarbonate hardness to a blend that is softened but not dominated by the Dartmoor granite reservoir baseline. South West Water draws on this limestone–reservoir blend for the Ivybridge distribution zone, yielding 212.5 mg/L with TDS 585.9 mg/L — hard water considerably harder than the Dartmoor upland granite supply areas of 30–70 mg/L, driven by the Devonian limestone spring contribution.

At 212.5 mg/L, limescale is a persistent household challenge in Ivybridge. 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 than in softer areas. 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 supply at Ivybridge is unexpected for a town on the Dartmoor edge and is directly attributable to the Devonian limestone spring blend that supplements the granite moorland supply.