Irvine Water Hardness & Quality Report (2026)

Irvine, the designated new town in North Ayrshire on the Firth of Clyde coast between Troon and Ardrossan, is supplied by Scottish Water from Camphill Reservoir and the network of upland reservoirs on the Carboniferous and Old Red Sandstone moorland of north Ayrshire. The Ayrshire upland reservoirs — including Camphill on the moorland of the Carmel Water catchment — impound moorland streams from the Carboniferous sandstone and Old Red Sandstone country of the Ayrshire hills east of Irvine. These sedimentary moorland rocks contribute very little dissolved calcium, producing soft water typical of the Scottish lowland supply. Scottish Water treats and distributes to Irvine and the North Ayrshire coastal towns from the upland Ayrshire reservoir system.

Irvine's soft water — 66.5 mg/L (4.7°Clark) — reflects the Carboniferous and Old Red Sandstone moorland catchments of the Ayrshire upland reservoir supply. The Drinking Water Quality Regulator for Scotland classifies this supply as soft.

Limescale is very minor in Irvine. At 66.5 mg/L, limescale builds slowly — kettles need descaling every two to three months. Combi-boiler heat exchangers accumulate minimal deposits; annual servicing is routine. Showerheads and taps remain largely clear. Washing-up liquid lathers well with the soft Ayrshire supply. Limescale is not a significant domestic concern for Irvine households on the Scottish Water Ayrshire reservoir supply.