Scottish Water supplies Scotland. Water is typically very soft (~30 mg/L CaCO₃) — virtually no limescale risk — your appliances will thank you. Enter your postcode for your exact zone's report.
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Scottish Water supplies Scotland with drinking water drawn from Highland and Lowland lochs, reservoirs, and river abstractions across Scotland — including Loch Katrine, Loch Turret, and many smaller Highland sources.
Scottish Water is the publicly owned supplier for all of Scotland, serving 5.4 million customers from Caithness to the Borders. Scotland's geology — predominantly ancient Precambrian and Devonian granite, schist, and gneiss — produces some of the softest, most mineral-free water in the UK. Hardness across Scotland is typically 10–50 mg/L CaCO₃, with Highland zones sometimes measuring below 20 mg/L. This means virtually zero limescale risk, but also means the water can be mildly corrosive — pH correction is standard at treatment works to prevent leaching of metals from household plumbing. Colour from peat in Highland catchments is the key aesthetic water quality challenge, and Scottish Water invests heavily in coagulation and filtration to meet the 20 Hazen colour standard.
With typical hardness of approximately 30 mg/L CaCO₃, water in the Scottish Water supply area is classified as very soft. This means minimal limescale risk and good appliance longevity across the supply area.
Notable: Very soft water throughout Scotland (10–50 mg/L). Virtually no limescale risk. Some Highland zones have elevated colour from peat. No active PFAS enforcement notices. pH correction needed for corrosiveness.
Yes. All treated water supplied by Scottish Water meets the UK Drinking Water Regulations. The Drinking Water Inspectorate (DWI) audits every water company annually — Scottish Water serves 5.4 million customers across 275 supply zones. Each zone is tested thousands of times per year and results are published in the annual compliance report.
However, water quality varies significantly between zones within the Scottish Water supply area. Your specific zone may have different hardness, nitrate, or THM levels from your neighbour in a different zone. That's why it's worth checking your exact postcode above.
Enter your postcode in the box above to see zone-specific data for your address — including hardness, nitrates, lead, chlorine, fluoride, and THMs — drawn directly from Scottish Water's most recent annual compliance report.
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