Tewkesbury Water Hardness & Quality Report (2026)

Severn Trent Water provides the tap water for Tewkesbury, drawing from a blend of sources across Gloucestershire and the West Midlands. These include rivers, reservoirs, and groundwater from boreholes. The primary treatment facility, the Gloucestershire Treatment Works, processes water originating from the Severn catchment and local aquifers. Here, raw water undergoes coagulation, filtration, and disinfection, with potential softening or blending to ensure it meets stringent quality standards set by the Drinking Water Inspectorate (DWI).

The water's journey begins in a landscape shaped by Jurassic limestones and Cretaceous chalk formations, notably the Cotswold Group. As rainwater filters through these permeable, carbonate-rich rocks, it picks up dissolved minerals like calcium and magnesium. While some surface water from less calcareous uplands offers a degree of softness, the significant mineral contribution from these extensive groundwater systems ultimately defines the water as moderately mineralised to hard, a characteristic prevalent in this limestone belt.

Homeowners in Tewkesbury may notice limescale buildup on fixtures like taps, kettles, and showerheads, as well as inside appliances such as boilers and washing machines. This can reduce the efficiency and lifespan of heating systems and dishwashers. Regular descaling with household solutions or using specialized detergents can help manage the issue. For those seeking a more permanent solution to scaling and improved soap lathering, installing a water softener is often a practical recommendation. The tap water consistently meets all UK DWI safety standards, with Severn Trent confirming compliance, though occasional notes of chlorine taste may be present due to disinfection.