Largs Water Hardness & Quality Report (2026)

Scottish Water supplies Largs, the north Ayrshire coastal town on the Firth of Clyde — a favourite day-trip destination for Glaswegians, with a Victorian esplanade, the Vikingar Viking heritage centre commemorating the Battle of Largs (1263), a regular ferry to Millport on the Isle of Cumbrae, and sweeping views across the Clyde towards Arran and the Kintyre peninsula — from Gogo Water reservoir in the North Ayrshire upland catchment above the town, treated at Largs Water Treatment Works. At 29 mg/L (2.0°Clark) and a TDS of just 52.4 mg/L, Largs's water is extremely soft — consistent with the impermeable Carboniferous sandstone, mudstone, and basalt upland of the North Ayrshire hills that contributes almost no calcium to the Gogo Water catchment.

Largs draws supply from Gogo Water reservoir in the North Ayrshire upland — a catchment of impermeable Carboniferous sandstone, mudstone, and Paleogene basalt rock with blanket peat moorland that yields very little calcium to surface runoff. The result is 29 mg/L with TDS 52.4 mg/L — extremely soft water characteristic of the west of Scotland Ayrshire coastal supply tier, comparable to other west Ayrshire communities in the same Scottish Water Clyde coast distribution zone.

At 29 mg/L, limescale is essentially not a domestic concern in Largs. Descaling the kettle a couple of times a year is all that is required. The combi-boiler has negligible calcium scaling risk. Washing-up liquid lathers very readily with minimal product. Taps and shower heads accumulate virtually no limescale. In older Largs properties with lead service pipes, residents should follow Scottish Water's advice to run the cold tap briefly before drinking, as extremely soft, low-TDS water has increased plumbo-solvent potential — a consistent precaution across the west of Scotland soft water supply zone.