Gourock Water Hardness & Quality Report (2026)

Scottish Water supplies Gourock, the Inverclyde coastal town at the west end of the Firth of Clyde — an Edwardian seaside resort of handsome terraces overlooking the Clyde with famous views across to Dunoon and the Cowal Peninsula, the ferry terminal for the CalMac Gourock–Dunoon crossing, and a community at the heart of the Inverclyde maritime tradition that stretches from Greenock's great shipyards to the Royal Gourock Yacht Club — from Compensation Reservoir on the upland above Gourock, treated at Daff Water Treatment Works in Inverclyde. At 55 mg/L (3.9°Clark), Gourock's water is soft — consistent with the impermeable Carboniferous Sandstone, Coal Measures, and Paleogene Basalt upland of the Inverclyde hills that contributes very little calcium to the reservoir catchment.

Gourock draws supply from the Inverclyde upland — a catchment of impermeable Carboniferous sandstone, mudstone, and basalt intrusions above the Clyde with peat moorland yielding low-mineralisation water. The result is 55 mg/L with TDS 113.4 mg/L — soft water with a moderate TDS/hardness ratio (2.06) characteristic of the Scottish Water Inverclyde coastal distribution zone at Greenock (54 mg/L) and Port Glasgow in the same Inverclyde upland reservoir supply zone.

At 55 mg/L, limescale is a minimal household concern in Gourock. 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 very readily. Taps and shower heads accumulate very little limescale; a quarterly wipe keeps fixtures clean. In older Gourock properties — particularly Victorian and Edwardian stone terraces with lead service pipes — residents should follow Scottish Water's precautionary guidance to run the cold tap briefly before drinking, as soft low-TDS water has elevated plumbo-solvent potential across the soft Inverclyde supply zone.