Kingsteignton Water Hardness & Quality Report (2026)

South West Water supplies Kingsteignton, the south Devon town on the River Teign near Newton Abbot — a busy community in the Teignbridge district that has grown substantially with modern housing on the Teign floodplain and hillside, adjacent to the famous Stover Country Park and the former ball clay workings of the Teign valley — from Tottiford and Kennick Reservoirs on the Dartmoor eastern fringe near Bovey Tracey, treated at Tottiford Water Treatment Works. At 182.5 mg/L (12.8°Clark), Kingsteignton's water is hard — harder than typical Dartmoor granite upland supply — reflecting significant calcium contributions from the Permo-Triassic Red Marl (Keuper Marl) geology of the Teign valley and the Devonian Limestone that outcrops in the Newton Abbot–Kingsteignton area.

Kingsteignton sits at the confluence of the Dartmoor granite upland supply and the Permo-Triassic red marl geology of the Teign estuary lowland. The Tottiford and Kennick reservoir supply (Dartmoor fringe) enters a distribution zone that traverses the Keuper Marl and Devonian Limestone geology of the Teignbridge area, picking up calcium and sulphate to produce 182.5 mg/L with TDS 472.3 mg/L — hard water with an elevated TDS/hardness ratio (2.59) consistent with a Triassic Marl and Devonian Limestone supply influence in the lower Teign valley.

At 182.5 mg/L, limescale is a consistent household challenge in Kingsteignton. 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 moderately hard Teign valley supply at Kingsteignton reflects the complex geology of the Teignbridge district — where Dartmoor granite upland reservoir water meets the Triassic red marl lowland to produce characteristically hard south Devon tap water.