Clayton-le-Woods Water Hardness & Quality Report (2026)

United Utilities supplies Clayton-le-Woods, a residential suburb south of Chorley in Lancashire at the foot of the West Pennine Moors, from the Lake District aqueduct system blended with Permo-Triassic Sandstone (New Red Sandstone) groundwater in the south Lancashire distribution zone, treated at regional Lancashire works. At 146.5 mg/L (10.3°Clark), Clayton-le-Woods' water is moderately hard, reflecting the transitional supply character between the soft West Pennine upland reservoirs and the more mineralised Triassic Sandstone groundwater of the Lancashire plain beneath Chorley.

Clayton-le-Woods sits at the geological transition where the West Pennine Moors — soft Millstone Grit and Lower Coal Measures upland — meets the Lancashire plain underlain by Permo-Triassic Sandstone (New Red Sandstone) with interstitial calcium carbonate cements. United Utilities' south Lancashire distribution zone draws on this Triassic groundwater to supplement the Lake District aqueduct supply, contributing elevated calcium and moderate mineralisation to the supply blend. The resulting 146.5 mg/L with TDS 406.6 mg/L reflects this transition zone character — harder than the pure West Pennine upland communities but softer than the most Triassic-dominant south Merseyside zones.

At 146.5 mg/L, limescale is a noticeable household concern in Clayton-le-Woods. 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 slightly more product than in softer areas. Taps and shower heads develop moderate limescale deposits within two to three weeks; a monthly wipe with white vinegar keeps fixtures in good condition. The moderately hard supply reflects the classic Lancashire transition between soft Pennine moorland and harder sandstone-plain groundwater.