Tyldesley Water Hardness & Quality Report (2026)

Tyldesley, in the Borough of Wigan in west Greater Manchester between Wigan and Leigh, is supplied by United Utilities from the Rivington Reservoir system — Rivington, Anglezarke, and Upper Roddlesworth — and the Thirlmere Lake District aqueduct. The Rivington reservoirs impound moorland streams from the Carboniferous Millstone Grit of the west Pennines above Horwich and Chorley, providing moderately soft upland supply. The Thirlmere aqueduct from the Lake District adds very soft water from the Borrowdale Volcanic catchment. United Utilities blends these through the south Lancashire supply grid, and Tyldesley's Wigan Borough position receives the blended supply with a moderate Rivington Pennine increment on the very soft Thirlmere base, producing a moderately soft supply typical of the south Wigan supply zone.

Tyldesley's hardness of 133.5 mg/L (9.4°Clark) reflects the blend of soft Thirlmere Lake District aqueduct and moderate Rivington west Pennine Millstone Grit reservoir supply in United Utilities' west Greater Manchester Wigan supply zone. The Drinking Water Inspectorate (DWI) classifies this supply as moderately soft.

Limescale is a moderate concern in Tyldesley. At 133.5 mg/L, limescale forms gradually in kettles and descaling every one to two months is typically sufficient. Combi-boiler heat exchangers accumulate modest deposits; annual servicing is sensible. Showerheads and taps develop light deposits. Washing-up liquid lathers reasonably well. A monthly Calgon tablet in the washing machine and a regular kettle descale is adequate limescale management for most Tyldesley households.