Barrow in Furness Water Hardness & Quality Report (2026)

Barrow-in-Furness, the south Cumbrian port and shipbuilding town on the Furness Peninsula, is supplied by United Utilities from the Lake District reservoir system and local Furness Peninsula upland catchments. United Utilities draws on Lake District water from the Windermere and Coniston lake catchments and the Thirlmere aqueduct, distributed through the south Cumbrian network. The Lake District catchments drain primarily Borrowdale Volcanic Group and Ordovician–Silurian rocks — ancient volcanic and sedimentary formations that are largely insoluble and yield soft water. The Furness Peninsula itself is underlain by Silurian sedimentary rocks and some Carboniferous Limestone at its margins — the limestone of the Furness Fells contributing a moderate calcium increment to local catchment supply.

Barrow-in-Furness's hardness of 120 mg/L (8.4°Clark) reflects the Lake District soft-water supply blended with a modest Carboniferous Limestone contribution from the Furness Fells margins. The Lake District catchments (Borrowdale Volcanic and Silurian fell country) provide the soft upland supply baseline, while the Carboniferous limestone at the edge of the Furness Peninsula — part of the same limestone that forms the famous Limestone Pavement at Humphrey Head on the nearby Kent estuary — contributes a small dissolved calcium increment. The Drinking Water Inspectorate (DWI) classifies this supply as moderately soft.

Limescale is a moderate concern in Barrow-in-Furness. At 120 mg/L, limescale forms gradually — kettles need descaling every one to two months and deposits on taps and showerheads accumulate slowly. Combi-boiler heat exchangers accumulate modest deposits; annual servicing is sensible. Washing-up liquid lathers reasonably well. The Lake District supply gives Barrow relatively easy limescale management — a monthly Calgon tablet in the washing machine and an occasional kettle descale is adequate maintenance for most households.