Kearsley Water Hardness & Quality Report (2026)

United Utilities supplies Kearsley, the Borough of Bolton community between Farnworth and Swinton on the Irwell plain — a former colliery and bleaching community at the foot of the Bolton coalfield, historically one of the most industrial parts of the south Lancashire plain, now a predominantly residential community in the Greater Manchester corridor north of Salford — from Pennine upland reservoirs blended with Permo-Triassic Sherwood Sandstone groundwater in the south Bolton–Salford distribution zone, treated at Franklaw Water Treatment Works near Preston. At 152.5 mg/L (10.7°Clark), Kearsley's water is moderately hard — reflecting a significant Triassic Sandstone groundwater fraction blended with the soft Pennine reservoir supply in the south Bolton plain distribution network.

Kearsley lies on the south Lancashire Permo-Triassic plain between the Bolton coalfield and the Salford/Irwell corridor. United Utilities supplies from Pennine upland reservoirs (soft) blended with a proportion of Triassic Sherwood Sandstone groundwater from the south Lancashire Triassic plain, producing 152.5 mg/L with TDS 416.9 mg/L — moderately hard water with an elevated TDS/hardness ratio (2.73) consistent with sulphate from the Triassic Keuper Marl and sandstone in the south Bolton–Kearsley distribution zone.

At 152.5 mg/L, limescale is a consistent household concern in Kearsley. 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. 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 supply at Kearsley is characteristic of the south Bolton Triassic plain — the same Permo-Triassic sandstone that underlies the old bleaching works also contributing calcium and sulphate to the tap water of this south Lancashire community.