Guisborough Water Hardness & Quality Report (2026)

Northumbrian Water Limited supplies Guisborough, located in Redcar and Cleveland, North East England. The utility draws water from a mix of sources, including the River Tees, upland reservoirs such as Scaling Dam and Levens Hall situated in the Pennines and North York Moors, and several groundwater boreholes. Water undergoes treatment at facilities like the Wilton works near Middlesbrough, employing processes like coagulation, filtration, chlorination, and fluoridation to meet Drinking Water Inspectorate standards. The watershed covers the Tees Valley and the eastern slopes of the North York Moors, ultimately draining into the North Sea.

Geologically, the area is characterized by Permian Magnesian Limestone and dolomitic limestones, with Triassic sandstones serving as minor aquifers. These carbonate-rich bedrock formations naturally dissolve calcium and magnesium into the water supply, both from surface runoff and percolating groundwater. This geological makeup results in a moderately mineralized water character, distinguishing it from the softer waters found in the peaty upland regions to the west.

This moderately hard water typically results in visible limescale buildup on household items like kettles and showerheads, and can reduce the efficiency of appliances such as boilers and washing machines by up to 30%. You might also notice soap scum in bathrooms and spotting on glassware. For homeowners, regularly descaling with vinegar, using magnetic conditioners, or installing a water softener can help manage these effects. Using rinse aids in dishwashers and checking filters quarterly are also beneficial steps. Northumbrian Water's reports confirm compliance with DWI standards, with typical pH levels between 7.4 and 8.0. While lead and copper levels are managed within limits, occasional iron or manganese from moorland sources are effectively treated.