Gateshead Water Hardness & Quality Report (2026)

Gateshead, the metropolitan borough on the south bank of the River Tyne opposite Newcastle, is supplied by Northumbrian Water from the River Wear catchment and the Kielder Transfer Scheme. Northumbrian Water serves Gateshead and the south Tyne corridor partly from the Wear catchment — drawing from Burnhope Reservoir and Waskerley Reservoir in west County Durham and from the River Wear treated at Frosterley and Wearmouth facilities — as well as from the Kielder-fed Tyne supply. The Wear catchment drains the western North Pennines but also traverses the Magnesian Limestone belt of east County Durham as the river turns east, adding moderate calcium from limestone dissolution. This Wear catchment contribution, blended into the Gateshead distribution zone, explains the higher hardness relative to purely North Tyne-fed areas.

Gateshead's hardness of 178.5 mg/L (12.5°Clark) is moderately hard for a north-east England city, reflecting the River Wear and County Durham Magnesian Limestone influence in the supply blend. The Permian Magnesian Limestone escarpment of east Durham — running north–south through County Durham east of Gateshead — yields groundwater with elevated calcium and magnesium from dolomitic limestone dissolution. The Northumbrian Water supply blend serving Gateshead incorporates a proportion of this harder Wear/Magnesian Limestone-influenced water alongside the very soft Kielder component. The Drinking Water Inspectorate (DWI) classifies this supply as moderately hard.

Limescale is a noticeable household concern in Gateshead. At 178.5 mg/L, limescale forms in kettles within three to four weeks and monthly descaling is sensible. Combi-boiler heat exchangers accumulate deposits steadily; annual servicing with a limescale check and fitting a scale inhibitor are recommended. Showerheads, taps, and bath surfaces develop regular deposits. Washing-up liquid lathers moderately. Using Calgon monthly in the washing machine and keeping up with limescale descaling is appropriate routine maintenance for Gateshead households.