Bo'ness Water Hardness & Quality Report (2026)

Scottish Water supplies Bo'ness (Borrowstounness), a historic industrial and port town on the south shore of the Firth of Forth in Falkirk district, from Carron Valley Reservoir in the Kilsyth Hills of Central Scotland, treated at Carron Valley Water Treatment Works before distribution across the Falkirk supply zone. At 30.5 mg/L (2.1°Clark) and a TDS of just 55.5 mg/L, Bo'ness has extremely soft water — among the most mineral-depleted tap water supplies in the British Isles — reflecting the calcium-poor volcanic and sedimentary rock catchment of the Kilsyth Hills.

Carron Valley Reservoir is impounded on the Endrick Water catchment in the Kilsyth Hills — a moorland plateau of Carboniferous basalt lavas and Carboniferous sandstone shale that form the volcanic uplands between the Campsie Fells and Stirlingshire. These Carboniferous lavas and shales are silica-rich, highly acid-resistant rocks with negligible calcium carbonate content, producing virtually calcium-free surface runoff from the Kilsyth moorland peat bogs. The resulting water at TDS just 55.5 mg/L is among the most demineralised tap water in Scotland and in the British Isles.

At 30.5 mg/L, limescale is virtually non-existent as a domestic concern in Bo'ness. Kettles need only a very occasional light wipe every four to six months. The combi-boiler requires no meaningful scale protection, though a basic inhibitor remains good practice. Washing-up liquid lathers abundantly with the smallest quantities of product. Taps and shower heads develop no meaningful mineral deposits and remain pristine with minimal maintenance. In older properties with lead or copper pipework, Bo'ness's extremely soft, slightly corrosive water warrants briefly running the cold tap before drinking — standard Scottish Water precautionary guidance throughout the very soft Carron Valley supply zone.