Altrincham Water Hardness & Quality Report (2026)

Altrincham, the market town in the Metropolitan Borough of Trafford in south Greater Manchester near the Cheshire border, is supplied by United Utilities from the River Dee treated at Huntington Water Treatment Works near Chester, and via the Thirlmere Lake District aqueduct. Altrincham's south Trafford position falls within the United Utilities supply zone fed primarily from the very soft Dee and Thirlmere sources — the same supply that serves north Merseyside (Bootle at 78.5 mg/L) and north Wirral (Wallasey at 97 mg/L). The River Dee in its upper Welsh catchment drains the Cambrian Mountains of Snowdonia — essentially calcium-free ancient volcanic and sedimentary rocks — producing very soft water at the Huntington abstraction. The Thirlmere Lake District supply adds further soft water.

Altrincham's soft water — 80.5 mg/L (5.6°Clark) — is markedly softer than adjacent Sale (185.5 mg/L) which falls in a different United Utilities supply zone receiving more Mersey catchment and Triassic sandstone blending. This significant hardness contrast within the same Trafford borough demonstrates the impact of supply zone boundaries on domestic water quality. The Drinking Water Inspectorate (DWI) classifies Altrincham's supply as soft.

Limescale is minor in Altrincham. At 80.5 mg/L, limescale builds slowly and kettles need descaling every two to three months. Combi-boiler heat exchangers accumulate minimal deposits; annual servicing is routine. Showerheads and taps remain largely clear. Washing-up liquid lathers very well with the soft Dee and Thirlmere supply. Limescale is not a significant domestic concern for Altrincham households on the soft south Manchester supply.