Westhill Water Hardness & Quality Report (2026)

Scottish Water supplies Westhill, a planned commuter town on the western outskirts of Aberdeen in Aberdeenshire — developed from the 1970s as a fast-growing suburb along the A944 Deeside Road, now a significant community in its own right with a large business park and retail centre — from the River Dee in the Cairngorm granite catchment, treated at Invercannie Water Treatment Works near Aboyne on Deeside. At 58 mg/L (4.1°Clark), Westhill's water is very soft — consistent with the Cairngorm Granite and Dalradian Metamorphic bedrock of the upper Dee catchment that produces naturally very soft, low-TDS water at Invercannie.

Westhill draws on the same Aberdeen city water supply zone as the wider Aberdeen conurbation, sourced from the River Dee at Invercannie. The Dee drains the Cairngorm granite massif and Dalradian quartzite and schist plateau — among the most impermeable, calcium-poor bedrock sequences in Britain — producing very soft source water with minimal calcium dissolution. The result is 58 mg/L with TDS 121.2 mg/L at Westhill — very soft water characteristic of all Aberdeen Dee-supply communities from the city centre westward through Westhill to Banchory.

At 58 mg/L, Westhill's very soft Dee water is comfortable for domestic use with very modest limescale demands. Descaling the kettle every two to three months is typically adequate. The combi-boiler will need only a simple scale inhibitor as a standard precaution. Washing-up liquid lathers well at everyday quantities. Taps and shower heads remain virtually scale-free with only occasional wipe maintenance. Residents in older Westhill properties should briefly run the cold tap before drinking, as soft water can be mildly corrosive to older copper or lead plumbing — standard Scottish Water guidance for the very soft Aberdeen Dee supply zone.