North Shields Water Hardness & Quality Report (2026)

North Shields, the North Tyneside coastal town at the mouth of the River Tyne, is supplied by Northumbrian Water from the Kielder Transfer Scheme blended with Permian Magnesian Limestone coastal aquifer groundwater from the east coastal North Tyneside and south-east Northumberland supply zone. While the Kielder Reservoir — fed by very soft Silurian greywacke and Carboniferous moorland catchments — dominates the Tyneside supply, North Shields's coastal position at the Tyne mouth draws on a Northumbrian Water distribution zone that incorporates a higher proportion of coastal Permian Magnesian Limestone groundwater than inland zones. The Magnesian Limestone of the Durham coast extends northward to the Tyne mouth coastal fringe, and this dolomitic limestone produces hard, moderately mineralised groundwater with elevated calcium and magnesium. The TDS of 567.2 mg/L — high relative to hardness — reflects the higher magnesium from dolomite dissolution.

North Shields's hard water — 196 mg/L (13.8°Clark) — is notably higher than Wallsend (125 mg/L) and Whitley Bay (82 mg/L) nearby, reflecting the Permian Magnesian Limestone coastal aquifer contribution in the east coastal North Tyneside distribution zone. The Drinking Water Inspectorate (DWI) classifies this supply as hard.

Limescale is a persistent household concern in North Shields. At 196 mg/L, limescale forms in kettles within two to three weeks and monthly descaling is advisable. Combi-boiler heat exchangers accumulate deposits steadily — annual boiler servicing and an in-line scale inhibitor are recommended. Showerheads, taps, and shower screens develop regular deposits. Washing-up liquid lathers poorly. Using Calgon monthly in the washing machine and a regular descaling routine is important limescale management for North Shields households.