Old Swan Water Hardness & Quality Report (2026)

United Utilities supplies Old Swan, an inner suburb in the east of the City of Liverpool near Edge Hill, from the Lake District aqueduct system — Thirlmere and Haweswater — treated at Prescot Water Treatment Works before distribution across the central-east Liverpool supply zone. At 87 mg/L (6.1°Clark), Old Swan's water is soft — much softer than the south Liverpool zones at Hunts Cross (178 mg/L) and Belle Vale (177 mg/L) — reflecting a higher proportion of the direct Lake District aqueduct supply reaching the central-east Liverpool distribution zone with less Triassic groundwater blending than in the south Merseyside network.

Thirlmere and Haweswater in the Lake District drain ancient Ordovician igneous rocks — Borrowdale Volcanic Series and Skiddaw Slates — producing inherently very soft water with near-zero calcium content. The central-east Liverpool distribution zone at Old Swan receives a substantially higher proportion of this Lake District aqueduct baseline supply than the south Liverpool zones, which draw much more heavily on local Permo-Triassic Sandstone groundwater. The modest hardness at 87 mg/L and TDS 212 mg/L reflects pH-correction treatment additions and minor trace mineral contributions from the local Liverpool distribution network.

At 87 mg/L, Old Swan's soft water is comfortable for domestic use. Limescale builds slowly; descaling the kettle every two to three months is typically adequate. The combi-boiler benefits from a standard scale inhibitor as a precaution. Washing-up liquid lathers well with everyday quantities. Taps and shower heads stay relatively clean with only occasional maintenance. The soft Lake District supply reaching Old Swan is characteristic of much of central Liverpool and the inner-city distribution zones, contrasting markedly with the harder water found in the outer south Liverpool suburbs.