West Bromwich Water Hardness & Quality Report (2026)

West Bromwich, the principal town in the Metropolitan Borough of Sandwell in the Black Country, is supplied by Severn Trent Water. Supply draws from the Elan Valley Reservoir system in Radnorshire — six linked reservoirs in mid-Wales conveying very soft water by gravity aqueduct to Frankley Water Treatment Works in Worcestershire — distributed through the West Midlands network. West Bromwich's supply, however, incorporates a significant proportion of locally abstracted groundwater from the Triassic Bunter Sandstone (Sherwood Sandstone) aquifer beneath Sandwell and the South Staffordshire coalfield area. South Staffordshire Waterworks (now integrated into Severn Trent) historically supplied the Black Country from local groundwater, and the distribution blend reaching West Bromwich reflects this dual heritage with a higher local sandstone groundwater component than central Birmingham.

West Bromwich's hardness of 134 mg/L (9.4°Clark) — considerably above Birmingham's 60–80 mg/L — reflects the Triassic Bunter Sandstone groundwater contribution in the Sandwell supply zone. The Sherwood Sandstone aquifer beneath the Black Country is a Permo-Triassic formation whose groundwater acquires moderate calcium and magnesium from mineralised sandstone cements and interleaved mudstone beds. This is blended with very soft Elan Valley supply, but the higher sandstone groundwater proportion in the Sandwell zone pushes hardness into the moderately soft–moderately hard range. The Drinking Water Inspectorate (DWI) classifies this supply as moderately hard.

Limescale requires moderate attention in West Bromwich homes. At 134 mg/L, limescale forms gradually and descaling every one to two months is typically sufficient. Combi-boiler heat exchangers accumulate deposits at a moderate rate and annual servicing with a limescale check is sensible. Showerheads and taps develop modest deposits. Washing-up liquid lathers reasonably well. Using Calgon monthly in the washing machine and occasional kettle descaling provides adequate limescale management for most West Bromwich households.