Leominster Water Hardness & Quality Report (2026)

Welsh Water supplies Leominster, the north Herefordshire market town on the River Lugg — an elegant Georgian market town of black-and-white timber-framed buildings, broad market streets, and a fine Priory Church, set in the rolling orchards and hop-fields of the Golden Valley and Herefordshire borderland — from the River Lugg catchment and upland sources in the Herefordshire–Powys borderland supply zone, treated at Leominster Water Treatment Works. At 108.5 mg/L (7.6°Clark), Leominster's water is slightly hard — reflecting modest calcium contributions from the Silurian Limestone (Wenlock and Aymestry Limestones) and Devonian Old Red Sandstone of the Welsh borderland that enriches the Lugg valley catchment supply above the soft upland baseline.

Leominster lies in the upper Lugg Valley where Welsh Water draws from the river and the Powys/Herefordshire upland catchment — a landscape of Silurian calcareous mudstone and limestone (the Wenlock Limestone and Aymestry Limestone series) interbedded with Old Red Sandstone (Devonian) that contribute modest calcium to produce 108.5 mg/L with TDS 252.9 mg/L — slightly hard, predominantly carbonate (TDS/hardness ratio 2.33) water characteristic of the Welsh Water Herefordshire borderland distribution zone at Kington and Bromyard in the same Lugg and Arrow catchment supply corridor.

At 108.5 mg/L, limescale is a moderate and manageable domestic concern in Leominster. Descaling the kettle every six to eight weeks is typically adequate. The combi-boiler benefits from a standard scale inhibitor as a precaution. Washing-up liquid lathers adequately at everyday quantities. Taps and shower heads develop moderate deposits over several weeks; a monthly wipe with white vinegar keeps fixtures in good condition. Leominster's slightly hard supply reflects the Silurian limestone character of the Herefordshire Welsh border — the same ancient limestone ridges that create the hop-yard landscape releasing modest calcium to the River Lugg and every Leominster household.