Hockley Water Hardness & Quality Report (2026)

Severn Trent Water supplies Hockley, an inner Birmingham district in the Jewellery Quarter conservation area — internationally celebrated for its concentration of jewellery workshops, goldsmiths, and design studios — from the Elan Valley aqueduct that carries soft Welsh upland water 118 kilometres from the Cambrian Mountains to Frankley Water Treatment Works in south Birmingham. At 105 mg/L (7.4°Clark), Hockley's water is soft, consistent with the Elan Valley supply that defines Birmingham's characteristic soft water quality throughout the city's supply network.

The Elan Valley reservoirs — Caban Coch, Claerwen, Garreg-ddu, Pen-y-Garreg, and Craig Goch — are impounded in the Cambrian Mountains of mid-Wales, draining ancient Silurian mudstones and Ordovician greywackes — acid, impermeable hard rocks with negligible calcium carbonate content. The resulting aqueduct water is naturally very soft, requiring only modest blending at Frankley to manage hardness. The 105 mg/L with TDS 232.4 mg/L at Hockley reflects the soft Welsh supply with a slight increment from distribution pipe mineralisation.

At 105 mg/L, Hockley's soft water is comfortable for domestic use with moderate limescale demands. Descaling the kettle every two to three months is typically adequate. The combi-boiler benefits from a standard scale inhibitor as a sensible precaution. Washing-up liquid lathers well at everyday quantities. Taps and shower heads remain relatively clean with only occasional maintenance. The soft Elan Valley supply is one of Birmingham's great inherited public goods — clean, low-mineral water from the Welsh hills, delivered by a Victorian gravity aqueduct that has served Birmingham's Jewellery Quarter and all city neighbourhoods since 1904.