Acocks Green Water Hardness & Quality Report (2026)

Acocks Green, the south-east Birmingham suburb in the city's outer ring between Sparkhill and Solihull, is supplied by Severn Trent Water from a supply dominated by soft upland Welsh water imported via the Elan Valley Aqueduct and treated at Frankley Water Treatment Works in south-west Birmingham. The Elan Valley Reservoirs — Caban Coch, Garreg Ddu, Pen-y-Garreg and Craig Goch — impound rainfall from the Cambrian mudstone and greywacke catchments of mid-Wales, yielding inherently soft, calcium-poor water. The Frankley treatment grid distributes this blend across the south and central Birmingham zone. In the Acocks Green supply area at Birmingham's south-east fringe, the supply incorporates some Permo-Triassic sandstone groundwater from the eastern Birmingham aquifer zone beneath Solihull and the Blythe valley, modestly raising hardness above purely Elan Valley-dominant zones. The TDS of 336.9 mg/L reflects this limited groundwater contribution.

The Cambrian sedimentary catchments of the Elan and Claerwen valleys produce the soft upland baseline of the Birmingham supply. The modest hardness elevation to 141 mg/L in Acocks Green — compared with 108.5 mg/L in the westernmost Black Country zones at Brierley Hill — reflects the greater distance from the Frankley trunk main and a slightly higher proportion of Bunter Sandstone groundwater from the south-east Birmingham and north Solihull distribution grid. The Triassic sandstone acquifer beneath south-east Birmingham dissolves modest calcium carbonate from cement horizons within the sandstone, adding to the baseline hardness.

At 141 mg/L Acocks Green's water is moderately soft and limescale management is modest compared with harder parts of the West Midlands. Kettles need descaling every six to eight weeks with a standard citric acid treatment. Shower screens develop only light mineral spotting and clean easily. Washing-up liquid lathers well. Combi-boilers and white goods face low scaling risk. Acocks Green's residential suburban character, with its inter-war semis and newer housing stock, benefits from the soft Welsh water supply that has characterised south Birmingham since the opening of the Elan Valley scheme in 1904.