Longsight Water Hardness & Quality Report (2026)

United Utilities supplies Longsight, an inner-city suburb in south-east Manchester, from the Lake District aqueduct system blended with groundwater in the east Manchester distribution zone, treated at Godley and regional Manchester area works before distribution. At 157.5 mg/L (11.0°Clark), Longsight's water is moderately soft — considerably harder than the soft Lake District baseline of Manchester city centre — reflecting a higher proportion of Permo-Triassic Sherwood Sandstone groundwater blended into the east Manchester distribution zone where the Triassic aquifer beneath east Manchester contributes moderate calcium hardness to the supply.

The Lake District aqueduct from Thirlmere and Haweswater delivers inherently very soft water from ancient Ordovician rock catchments. However, the east Manchester distribution zone draws a higher proportion of local groundwater from the Sherwood Sandstone aquifer beneath the Cheshire and south Lancashire plain than the city centre zones do. The Sherwood Sandstone contains interstitial calcium carbonate cements that contribute moderate hardness during groundwater percolation. The blend proportions in the Longsight distribution zone elevate hardness from the ~90–100 mg/L Manchester city centre average to 157.5 mg/L with TDS 428.1 mg/L.

At 157.5 mg/L, limescale is a noticeable domestic concern in Longsight. 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 performs adequately at everyday quantities. Taps and shower heads develop moderate limescale deposits over a few weeks; a monthly wipe with white vinegar or a mild descaler keeps fixtures in good condition. The moderately soft water in Longsight is noticeably harder than the soft Pennine supply reaching the west and north Manchester suburbs.