Abertillery Water Hardness & Quality Report (2026)

Welsh Water supplies Abertillery (Abertyleri), the Blaenau Gwent valley town in the Ebbw Fach Valley — a former iron, coal, and steel town that was once one of the most densely populated and industrially intense communities in south Wales, retaining its strong Welsh identity and closely-knit community character despite the closure of all coal and steel industry — from the Sor Brook Reservoir and upland sources in the Blaenau Gwent catchment, treated at Llangynidr Water Treatment Works in the Brecon Beacons. At 77 mg/L (5.4°Clark), Abertillery's water is soft — consistent with the impermeable Carboniferous Coal Measures (Westphalian) shale, mudstone, and sandstone that blanket the upper Ebbw Fach catchment, contributing almost no calcium to upland surface runoff.

Abertillery lies in the deep Ebbw Fach valley where the surrounding hills are underlain by impermeable Carboniferous Coal Measures — the same coal-bearing strata that powered the great valley ironworks and collieries now yield almost no calcium to the upland catchment. The result is 77 mg/L with TDS 139.7 mg/L — soft water consistent with the south Wales valley corridor supply tier at Brynmawr, Ebbw Vale (70 mg/L), and Tredegar in the same Welsh Water Blaenau Gwent and Gwent Valleys distribution zone.

At 77 mg/L, limescale is a minimal household concern in Abertillery. Kettle descaling every two to three months is typically all that is required. The combi-boiler has very low scaling risk. Washing-up liquid lathers easily with small quantities. Taps and shower heads accumulate very little limescale; a quarterly wipe keeps fixtures clean. Abertillery's soft valley supply is characteristic of the south Wales coal country — the ancient Coal Measures that made the Ebbw Fach valleys industrial powerhouses producing water as soft as the rain that fell on the winding gear.